diff --git a/backend/ent/channelmonitor.go b/backend/ent/channelmonitor.go
index dbb73362..defd06c6 100644
--- a/backend/ent/channelmonitor.go
+++ b/backend/ent/channelmonitor.go
@@ -27,6 +27,8 @@ type ChannelMonitor struct {
 	Name string `json:"name,omitempty"`
 	// Provider holds the value of the "provider" field.
 	Provider channelmonitor.Provider `json:"provider,omitempty"`
+	// OpenAI request protocol: chat_completions or responses; non-OpenAI uses chat_completions
+	APIMode string `json:"api_mode,omitempty"`
 	// Provider base origin, e.g. https://api.openai.com
 	Endpoint string `json:"endpoint,omitempty"`
 	// AES-256-GCM encrypted API key
@@ -112,7 +114,7 @@ func (*ChannelMonitor) scanValues(columns []string) ([]any, error) {
 			values[i] = new(sql.NullBool)
 		case channelmonitor.FieldID, channelmonitor.FieldIntervalSeconds, channelmonitor.FieldCreatedBy, channelmonitor.FieldTemplateID:
 			values[i] = new(sql.NullInt64)
-		case channelmonitor.FieldName, channelmonitor.FieldProvider, channelmonitor.FieldEndpoint, channelmonitor.FieldAPIKeyEncrypted, channelmonitor.FieldPrimaryModel, channelmonitor.FieldGroupName, channelmonitor.FieldBodyOverrideMode:
+		case channelmonitor.FieldName, channelmonitor.FieldProvider, channelmonitor.FieldAPIMode, channelmonitor.FieldEndpoint, channelmonitor.FieldAPIKeyEncrypted, channelmonitor.FieldPrimaryModel, channelmonitor.FieldGroupName, channelmonitor.FieldBodyOverrideMode:
 			values[i] = new(sql.NullString)
 		case channelmonitor.FieldCreatedAt, channelmonitor.FieldUpdatedAt, channelmonitor.FieldLastCheckedAt:
 			values[i] = new(sql.NullTime)
@@ -161,6 +163,12 @@ func (_m *ChannelMonitor) assignValues(columns []string, values []any) error {
 			} else if value.Valid {
 				_m.Provider = channelmonitor.Provider(value.String)
 			}
+		case channelmonitor.FieldAPIMode:
+			if value, ok := values[i].(*sql.NullString); !ok {
+				return fmt.Errorf("unexpected type %T for field api_mode", values[i])
+			} else if value.Valid {
+				_m.APIMode = value.String
+			}
 		case channelmonitor.FieldEndpoint:
 			if value, ok := values[i].(*sql.NullString); !ok {
 				return fmt.Errorf("unexpected type %T for field endpoint", values[i])
@@ -310,6 +318,9 @@ func (_m *ChannelMonitor) String() string {
 	builder.WriteString("provider=")
 	builder.WriteString(fmt.Sprintf("%v", _m.Provider))
 	builder.WriteString(", ")
+	builder.WriteString("api_mode=")
+	builder.WriteString(_m.APIMode)
+	builder.WriteString(", ")
 	builder.WriteString("endpoint=")
 	builder.WriteString(_m.Endpoint)
 	builder.WriteString(", ")
diff --git a/backend/ent/channelmonitor/channelmonitor.go b/backend/ent/channelmonitor/channelmonitor.go
index e5a6bfe7..0723ad0d 100644
--- a/backend/ent/channelmonitor/channelmonitor.go
+++ b/backend/ent/channelmonitor/channelmonitor.go
@@ -23,6 +23,8 @@ const (
 	FieldName = "name"
 	// FieldProvider holds the string denoting the provider field in the database.
 	FieldProvider = "provider"
+	// FieldAPIMode holds the string denoting the api_mode field in the database.
+	FieldAPIMode = "api_mode"
 	// FieldEndpoint holds the string denoting the endpoint field in the database.
 	FieldEndpoint = "endpoint"
 	// FieldAPIKeyEncrypted holds the string denoting the api_key_encrypted field in the database.
@@ -87,6 +89,7 @@ var Columns = []string{
 	FieldUpdatedAt,
 	FieldName,
 	FieldProvider,
+	FieldAPIMode,
 	FieldEndpoint,
 	FieldAPIKeyEncrypted,
 	FieldPrimaryModel,
@@ -121,6 +124,10 @@ var (
 	UpdateDefaultUpdatedAt func() time.Time
 	// NameValidator is a validator for the "name" field. It is called by the builders before save.
 	NameValidator func(string) error
+	// DefaultAPIMode holds the default value on creation for the "api_mode" field.
+	DefaultAPIMode string
+	// APIModeValidator is a validator for the "api_mode" field. It is called by the builders before save.
+	APIModeValidator func(string) error
 	// EndpointValidator is a validator for the "endpoint" field. It is called by the builders before save.
 	EndpointValidator func(string) error
 	// APIKeyEncryptedValidator is a validator for the "api_key_encrypted" field. It is called by the builders before save.
@@ -197,6 +204,11 @@ func ByProvider(opts ...sql.OrderTermOption) OrderOption {
 	return sql.OrderByField(FieldProvider, opts...).ToFunc()
 }
 
+// ByAPIMode orders the results by the api_mode field.
+func ByAPIMode(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldAPIMode, opts...).ToFunc()
+}
+
 // ByEndpoint orders the results by the endpoint field.
 func ByEndpoint(opts ...sql.OrderTermOption) OrderOption {
 	return sql.OrderByField(FieldEndpoint, opts...).ToFunc()
diff --git a/backend/ent/channelmonitor/where.go b/backend/ent/channelmonitor/where.go
index 755d83a3..8bd8f627 100644
--- a/backend/ent/channelmonitor/where.go
+++ b/backend/ent/channelmonitor/where.go
@@ -70,6 +70,11 @@ func Name(v string) predicate.ChannelMonitor {
 	return predicate.ChannelMonitor(sql.FieldEQ(FieldName, v))
 }
 
+// APIMode applies equality check predicate on the "api_mode" field. It's identical to APIModeEQ.
+func APIMode(v string) predicate.ChannelMonitor {
+	return predicate.ChannelMonitor(sql.FieldEQ(FieldAPIMode, v))
+}
+
 // Endpoint applies equality check predicate on the "endpoint" field. It's identical to EndpointEQ.
 func Endpoint(v string) predicate.ChannelMonitor {
 	return predicate.ChannelMonitor(sql.FieldEQ(FieldEndpoint, v))
@@ -285,6 +290,71 @@ func ProviderNotIn(vs ...Provider) predicate.ChannelMonitor {
 	return predicate.ChannelMonitor(sql.FieldNotIn(FieldProvider, vs...))
 }
 
+// APIModeEQ applies the EQ predicate on the "api_mode" field.
+func APIModeEQ(v string) predicate.ChannelMonitor {
+	return predicate.ChannelMonitor(sql.FieldEQ(FieldAPIMode, v))
+}
+
+// APIModeNEQ applies the NEQ predicate on the "api_mode" field.
+func APIModeNEQ(v string) predicate.ChannelMonitor {
+	return predicate.ChannelMonitor(sql.FieldNEQ(FieldAPIMode, v))
+}
+
+// APIModeIn applies the In predicate on the "api_mode" field.
+func APIModeIn(vs ...string) predicate.ChannelMonitor {
+	return predicate.ChannelMonitor(sql.FieldIn(FieldAPIMode, vs...))
+}
+
+// APIModeNotIn applies the NotIn predicate on the "api_mode" field.
+func APIModeNotIn(vs ...string) predicate.ChannelMonitor {
+	return predicate.ChannelMonitor(sql.FieldNotIn(FieldAPIMode, vs...))
+}
+
+// APIModeGT applies the GT predicate on the "api_mode" field.
+func APIModeGT(v string) predicate.ChannelMonitor {
+	return predicate.ChannelMonitor(sql.FieldGT(FieldAPIMode, v))
+}
+
+// APIModeGTE applies the GTE predicate on the "api_mode" field.
+func APIModeGTE(v string) predicate.ChannelMonitor {
+	return predicate.ChannelMonitor(sql.FieldGTE(FieldAPIMode, v))
+}
+
+// APIModeLT applies the LT predicate on the "api_mode" field.
+func APIModeLT(v string) predicate.ChannelMonitor {
+	return predicate.ChannelMonitor(sql.FieldLT(FieldAPIMode, v))
+}
+
+// APIModeLTE applies the LTE predicate on the "api_mode" field.
+func APIModeLTE(v string) predicate.ChannelMonitor {
+	return predicate.ChannelMonitor(sql.FieldLTE(FieldAPIMode, v))
+}
+
+// APIModeContains applies the Contains predicate on the "api_mode" field.
+func APIModeContains(v string) predicate.ChannelMonitor {
+	return predicate.ChannelMonitor(sql.FieldContains(FieldAPIMode, v))
+}
+
+// APIModeHasPrefix applies the HasPrefix predicate on the "api_mode" field.
+func APIModeHasPrefix(v string) predicate.ChannelMonitor {
+	return predicate.ChannelMonitor(sql.FieldHasPrefix(FieldAPIMode, v))
+}
+
+// APIModeHasSuffix applies the HasSuffix predicate on the "api_mode" field.
+func APIModeHasSuffix(v string) predicate.ChannelMonitor {
+	return predicate.ChannelMonitor(sql.FieldHasSuffix(FieldAPIMode, v))
+}
+
+// APIModeEqualFold applies the EqualFold predicate on the "api_mode" field.
+func APIModeEqualFold(v string) predicate.ChannelMonitor {
+	return predicate.ChannelMonitor(sql.FieldEqualFold(FieldAPIMode, v))
+}
+
+// APIModeContainsFold applies the ContainsFold predicate on the "api_mode" field.
+func APIModeContainsFold(v string) predicate.ChannelMonitor {
+	return predicate.ChannelMonitor(sql.FieldContainsFold(FieldAPIMode, v))
+}
+
 // EndpointEQ applies the EQ predicate on the "endpoint" field.
 func EndpointEQ(v string) predicate.ChannelMonitor {
 	return predicate.ChannelMonitor(sql.FieldEQ(FieldEndpoint, v))
diff --git a/backend/ent/channelmonitor_create.go b/backend/ent/channelmonitor_create.go
index 2f70c300..2593893f 100644
--- a/backend/ent/channelmonitor_create.go
+++ b/backend/ent/channelmonitor_create.go
@@ -65,6 +65,20 @@ func (_c *ChannelMonitorCreate) SetProvider(v channelmonitor.Provider) *ChannelM
 	return _c
 }
 
+// SetAPIMode sets the "api_mode" field.
+func (_c *ChannelMonitorCreate) SetAPIMode(v string) *ChannelMonitorCreate {
+	_c.mutation.SetAPIMode(v)
+	return _c
+}
+
+// SetNillableAPIMode sets the "api_mode" field if the given value is not nil.
+func (_c *ChannelMonitorCreate) SetNillableAPIMode(v *string) *ChannelMonitorCreate {
+	if v != nil {
+		_c.SetAPIMode(*v)
+	}
+	return _c
+}
+
 // SetEndpoint sets the "endpoint" field.
 func (_c *ChannelMonitorCreate) SetEndpoint(v string) *ChannelMonitorCreate {
 	_c.mutation.SetEndpoint(v)
@@ -275,6 +289,10 @@ func (_c *ChannelMonitorCreate) defaults() {
 		v := channelmonitor.DefaultUpdatedAt()
 		_c.mutation.SetUpdatedAt(v)
 	}
+	if _, ok := _c.mutation.APIMode(); !ok {
+		v := channelmonitor.DefaultAPIMode
+		_c.mutation.SetAPIMode(v)
+	}
 	if _, ok := _c.mutation.ExtraModels(); !ok {
 		v := channelmonitor.DefaultExtraModels
 		_c.mutation.SetExtraModels(v)
@@ -321,6 +339,14 @@ func (_c *ChannelMonitorCreate) check() error {
 			return &ValidationError{Name: "provider", err: fmt.Errorf(`ent: validator failed for field "ChannelMonitor.provider": %w`, err)}
 		}
 	}
+	if _, ok := _c.mutation.APIMode(); !ok {
+		return &ValidationError{Name: "api_mode", err: errors.New(`ent: missing required field "ChannelMonitor.api_mode"`)}
+	}
+	if v, ok := _c.mutation.APIMode(); ok {
+		if err := channelmonitor.APIModeValidator(v); err != nil {
+			return &ValidationError{Name: "api_mode", err: fmt.Errorf(`ent: validator failed for field "ChannelMonitor.api_mode": %w`, err)}
+		}
+	}
 	if _, ok := _c.mutation.Endpoint(); !ok {
 		return &ValidationError{Name: "endpoint", err: errors.New(`ent: missing required field "ChannelMonitor.endpoint"`)}
 	}
@@ -421,6 +447,10 @@ func (_c *ChannelMonitorCreate) createSpec() (*ChannelMonitor, *sqlgraph.CreateS
 		_spec.SetField(channelmonitor.FieldProvider, field.TypeEnum, value)
 		_node.Provider = value
 	}
+	if value, ok := _c.mutation.APIMode(); ok {
+		_spec.SetField(channelmonitor.FieldAPIMode, field.TypeString, value)
+		_node.APIMode = value
+	}
 	if value, ok := _c.mutation.Endpoint(); ok {
 		_spec.SetField(channelmonitor.FieldEndpoint, field.TypeString, value)
 		_node.Endpoint = value
@@ -606,6 +636,18 @@ func (u *ChannelMonitorUpsert) UpdateProvider() *ChannelMonitorUpsert {
 	return u
 }
 
+// SetAPIMode sets the "api_mode" field.
+func (u *ChannelMonitorUpsert) SetAPIMode(v string) *ChannelMonitorUpsert {
+	u.Set(channelmonitor.FieldAPIMode, v)
+	return u
+}
+
+// UpdateAPIMode sets the "api_mode" field to the value that was provided on create.
+func (u *ChannelMonitorUpsert) UpdateAPIMode() *ChannelMonitorUpsert {
+	u.SetExcluded(channelmonitor.FieldAPIMode)
+	return u
+}
+
 // SetEndpoint sets the "endpoint" field.
 func (u *ChannelMonitorUpsert) SetEndpoint(v string) *ChannelMonitorUpsert {
 	u.Set(channelmonitor.FieldEndpoint, v)
@@ -885,6 +927,20 @@ func (u *ChannelMonitorUpsertOne) UpdateProvider() *ChannelMonitorUpsertOne {
 	})
 }
 
+// SetAPIMode sets the "api_mode" field.
+func (u *ChannelMonitorUpsertOne) SetAPIMode(v string) *ChannelMonitorUpsertOne {
+	return u.Update(func(s *ChannelMonitorUpsert) {
+		s.SetAPIMode(v)
+	})
+}
+
+// UpdateAPIMode sets the "api_mode" field to the value that was provided on create.
+func (u *ChannelMonitorUpsertOne) UpdateAPIMode() *ChannelMonitorUpsertOne {
+	return u.Update(func(s *ChannelMonitorUpsert) {
+		s.UpdateAPIMode()
+	})
+}
+
 // SetEndpoint sets the "endpoint" field.
 func (u *ChannelMonitorUpsertOne) SetEndpoint(v string) *ChannelMonitorUpsertOne {
 	return u.Update(func(s *ChannelMonitorUpsert) {
@@ -1362,6 +1418,20 @@ func (u *ChannelMonitorUpsertBulk) UpdateProvider() *ChannelMonitorUpsertBulk {
 	})
 }
 
+// SetAPIMode sets the "api_mode" field.
+func (u *ChannelMonitorUpsertBulk) SetAPIMode(v string) *ChannelMonitorUpsertBulk {
+	return u.Update(func(s *ChannelMonitorUpsert) {
+		s.SetAPIMode(v)
+	})
+}
+
+// UpdateAPIMode sets the "api_mode" field to the value that was provided on create.
+func (u *ChannelMonitorUpsertBulk) UpdateAPIMode() *ChannelMonitorUpsertBulk {
+	return u.Update(func(s *ChannelMonitorUpsert) {
+		s.UpdateAPIMode()
+	})
+}
+
 // SetEndpoint sets the "endpoint" field.
 func (u *ChannelMonitorUpsertBulk) SetEndpoint(v string) *ChannelMonitorUpsertBulk {
 	return u.Update(func(s *ChannelMonitorUpsert) {
diff --git a/backend/ent/channelmonitor_update.go b/backend/ent/channelmonitor_update.go
index 4bbcd564..2cd5e656 100644
--- a/backend/ent/channelmonitor_update.go
+++ b/backend/ent/channelmonitor_update.go
@@ -66,6 +66,20 @@ func (_u *ChannelMonitorUpdate) SetNillableProvider(v *channelmonitor.Provider)
 	return _u
 }
 
+// SetAPIMode sets the "api_mode" field.
+func (_u *ChannelMonitorUpdate) SetAPIMode(v string) *ChannelMonitorUpdate {
+	_u.mutation.SetAPIMode(v)
+	return _u
+}
+
+// SetNillableAPIMode sets the "api_mode" field if the given value is not nil.
+func (_u *ChannelMonitorUpdate) SetNillableAPIMode(v *string) *ChannelMonitorUpdate {
+	if v != nil {
+		_u.SetAPIMode(*v)
+	}
+	return _u
+}
+
 // SetEndpoint sets the "endpoint" field.
 func (_u *ChannelMonitorUpdate) SetEndpoint(v string) *ChannelMonitorUpdate {
 	_u.mutation.SetEndpoint(v)
@@ -418,6 +432,11 @@ func (_u *ChannelMonitorUpdate) check() error {
 			return &ValidationError{Name: "provider", err: fmt.Errorf(`ent: validator failed for field "ChannelMonitor.provider": %w`, err)}
 		}
 	}
+	if v, ok := _u.mutation.APIMode(); ok {
+		if err := channelmonitor.APIModeValidator(v); err != nil {
+			return &ValidationError{Name: "api_mode", err: fmt.Errorf(`ent: validator failed for field "ChannelMonitor.api_mode": %w`, err)}
+		}
+	}
 	if v, ok := _u.mutation.Endpoint(); ok {
 		if err := channelmonitor.EndpointValidator(v); err != nil {
 			return &ValidationError{Name: "endpoint", err: fmt.Errorf(`ent: validator failed for field "ChannelMonitor.endpoint": %w`, err)}
@@ -472,6 +491,9 @@ func (_u *ChannelMonitorUpdate) sqlSave(ctx context.Context) (_node int, err err
 	if value, ok := _u.mutation.Provider(); ok {
 		_spec.SetField(channelmonitor.FieldProvider, field.TypeEnum, value)
 	}
+	if value, ok := _u.mutation.APIMode(); ok {
+		_spec.SetField(channelmonitor.FieldAPIMode, field.TypeString, value)
+	}
 	if value, ok := _u.mutation.Endpoint(); ok {
 		_spec.SetField(channelmonitor.FieldEndpoint, field.TypeString, value)
 	}
@@ -701,6 +723,20 @@ func (_u *ChannelMonitorUpdateOne) SetNillableProvider(v *channelmonitor.Provide
 	return _u
 }
 
+// SetAPIMode sets the "api_mode" field.
+func (_u *ChannelMonitorUpdateOne) SetAPIMode(v string) *ChannelMonitorUpdateOne {
+	_u.mutation.SetAPIMode(v)
+	return _u
+}
+
+// SetNillableAPIMode sets the "api_mode" field if the given value is not nil.
+func (_u *ChannelMonitorUpdateOne) SetNillableAPIMode(v *string) *ChannelMonitorUpdateOne {
+	if v != nil {
+		_u.SetAPIMode(*v)
+	}
+	return _u
+}
+
 // SetEndpoint sets the "endpoint" field.
 func (_u *ChannelMonitorUpdateOne) SetEndpoint(v string) *ChannelMonitorUpdateOne {
 	_u.mutation.SetEndpoint(v)
@@ -1066,6 +1102,11 @@ func (_u *ChannelMonitorUpdateOne) check() error {
 			return &ValidationError{Name: "provider", err: fmt.Errorf(`ent: validator failed for field "ChannelMonitor.provider": %w`, err)}
 		}
 	}
+	if v, ok := _u.mutation.APIMode(); ok {
+		if err := channelmonitor.APIModeValidator(v); err != nil {
+			return &ValidationError{Name: "api_mode", err: fmt.Errorf(`ent: validator failed for field "ChannelMonitor.api_mode": %w`, err)}
+		}
+	}
 	if v, ok := _u.mutation.Endpoint(); ok {
 		if err := channelmonitor.EndpointValidator(v); err != nil {
 			return &ValidationError{Name: "endpoint", err: fmt.Errorf(`ent: validator failed for field "ChannelMonitor.endpoint": %w`, err)}
@@ -1137,6 +1178,9 @@ func (_u *ChannelMonitorUpdateOne) sqlSave(ctx context.Context) (_node *ChannelM
 	if value, ok := _u.mutation.Provider(); ok {
 		_spec.SetField(channelmonitor.FieldProvider, field.TypeEnum, value)
 	}
+	if value, ok := _u.mutation.APIMode(); ok {
+		_spec.SetField(channelmonitor.FieldAPIMode, field.TypeString, value)
+	}
 	if value, ok := _u.mutation.Endpoint(); ok {
 		_spec.SetField(channelmonitor.FieldEndpoint, field.TypeString, value)
 	}
diff --git a/backend/ent/channelmonitorrequesttemplate.go b/backend/ent/channelmonitorrequesttemplate.go
index b8429a4d..7f417efb 100644
--- a/backend/ent/channelmonitorrequesttemplate.go
+++ b/backend/ent/channelmonitorrequesttemplate.go
@@ -26,6 +26,8 @@ type ChannelMonitorRequestTemplate struct {
 	Name string `json:"name,omitempty"`
 	// Provider holds the value of the "provider" field.
 	Provider channelmonitorrequesttemplate.Provider `json:"provider,omitempty"`
+	// OpenAI request protocol: chat_completions or responses; non-OpenAI uses chat_completions
+	APIMode string `json:"api_mode,omitempty"`
 	// Description holds the value of the "description" field.
 	Description string `json:"description,omitempty"`
 	// ExtraHeaders holds the value of the "extra_headers" field.
@@ -67,7 +69,7 @@ func (*ChannelMonitorRequestTemplate) scanValues(columns []string) ([]any, error
 			values[i] = new([]byte)
 		case channelmonitorrequesttemplate.FieldID:
 			values[i] = new(sql.NullInt64)
-		case channelmonitorrequesttemplate.FieldName, channelmonitorrequesttemplate.FieldProvider, channelmonitorrequesttemplate.FieldDescription, channelmonitorrequesttemplate.FieldBodyOverrideMode:
+		case channelmonitorrequesttemplate.FieldName, channelmonitorrequesttemplate.FieldProvider, channelmonitorrequesttemplate.FieldAPIMode, channelmonitorrequesttemplate.FieldDescription, channelmonitorrequesttemplate.FieldBodyOverrideMode:
 			values[i] = new(sql.NullString)
 		case channelmonitorrequesttemplate.FieldCreatedAt, channelmonitorrequesttemplate.FieldUpdatedAt:
 			values[i] = new(sql.NullTime)
@@ -116,6 +118,12 @@ func (_m *ChannelMonitorRequestTemplate) assignValues(columns []string, values [
 			} else if value.Valid {
 				_m.Provider = channelmonitorrequesttemplate.Provider(value.String)
 			}
+		case channelmonitorrequesttemplate.FieldAPIMode:
+			if value, ok := values[i].(*sql.NullString); !ok {
+				return fmt.Errorf("unexpected type %T for field api_mode", values[i])
+			} else if value.Valid {
+				_m.APIMode = value.String
+			}
 		case channelmonitorrequesttemplate.FieldDescription:
 			if value, ok := values[i].(*sql.NullString); !ok {
 				return fmt.Errorf("unexpected type %T for field description", values[i])
@@ -197,6 +205,9 @@ func (_m *ChannelMonitorRequestTemplate) String() string {
 	builder.WriteString("provider=")
 	builder.WriteString(fmt.Sprintf("%v", _m.Provider))
 	builder.WriteString(", ")
+	builder.WriteString("api_mode=")
+	builder.WriteString(_m.APIMode)
+	builder.WriteString(", ")
 	builder.WriteString("description=")
 	builder.WriteString(_m.Description)
 	builder.WriteString(", ")
diff --git a/backend/ent/channelmonitorrequesttemplate/channelmonitorrequesttemplate.go b/backend/ent/channelmonitorrequesttemplate/channelmonitorrequesttemplate.go
index 65b8d641..db04aee1 100644
--- a/backend/ent/channelmonitorrequesttemplate/channelmonitorrequesttemplate.go
+++ b/backend/ent/channelmonitorrequesttemplate/channelmonitorrequesttemplate.go
@@ -23,6 +23,8 @@ const (
 	FieldName = "name"
 	// FieldProvider holds the string denoting the provider field in the database.
 	FieldProvider = "provider"
+	// FieldAPIMode holds the string denoting the api_mode field in the database.
+	FieldAPIMode = "api_mode"
 	// FieldDescription holds the string denoting the description field in the database.
 	FieldDescription = "description"
 	// FieldExtraHeaders holds the string denoting the extra_headers field in the database.
@@ -51,6 +53,7 @@ var Columns = []string{
 	FieldUpdatedAt,
 	FieldName,
 	FieldProvider,
+	FieldAPIMode,
 	FieldDescription,
 	FieldExtraHeaders,
 	FieldBodyOverrideMode,
@@ -76,6 +79,10 @@ var (
 	UpdateDefaultUpdatedAt func() time.Time
 	// NameValidator is a validator for the "name" field. It is called by the builders before save.
 	NameValidator func(string) error
+	// DefaultAPIMode holds the default value on creation for the "api_mode" field.
+	DefaultAPIMode string
+	// APIModeValidator is a validator for the "api_mode" field. It is called by the builders before save.
+	APIModeValidator func(string) error
 	// DefaultDescription holds the default value on creation for the "description" field.
 	DefaultDescription string
 	// DescriptionValidator is a validator for the "description" field. It is called by the builders before save.
@@ -140,6 +147,11 @@ func ByProvider(opts ...sql.OrderTermOption) OrderOption {
 	return sql.OrderByField(FieldProvider, opts...).ToFunc()
 }
 
+// ByAPIMode orders the results by the api_mode field.
+func ByAPIMode(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldAPIMode, opts...).ToFunc()
+}
+
 // ByDescription orders the results by the description field.
 func ByDescription(opts ...sql.OrderTermOption) OrderOption {
 	return sql.OrderByField(FieldDescription, opts...).ToFunc()
diff --git a/backend/ent/channelmonitorrequesttemplate/where.go b/backend/ent/channelmonitorrequesttemplate/where.go
index b95e5df0..9f6d7333 100644
--- a/backend/ent/channelmonitorrequesttemplate/where.go
+++ b/backend/ent/channelmonitorrequesttemplate/where.go
@@ -70,6 +70,11 @@ func Name(v string) predicate.ChannelMonitorRequestTemplate {
 	return predicate.ChannelMonitorRequestTemplate(sql.FieldEQ(FieldName, v))
 }
 
+// APIMode applies equality check predicate on the "api_mode" field. It's identical to APIModeEQ.
+func APIMode(v string) predicate.ChannelMonitorRequestTemplate {
+	return predicate.ChannelMonitorRequestTemplate(sql.FieldEQ(FieldAPIMode, v))
+}
+
 // Description applies equality check predicate on the "description" field. It's identical to DescriptionEQ.
 func Description(v string) predicate.ChannelMonitorRequestTemplate {
 	return predicate.ChannelMonitorRequestTemplate(sql.FieldEQ(FieldDescription, v))
@@ -245,6 +250,71 @@ func ProviderNotIn(vs ...Provider) predicate.ChannelMonitorRequestTemplate {
 	return predicate.ChannelMonitorRequestTemplate(sql.FieldNotIn(FieldProvider, vs...))
 }
 
+// APIModeEQ applies the EQ predicate on the "api_mode" field.
+func APIModeEQ(v string) predicate.ChannelMonitorRequestTemplate {
+	return predicate.ChannelMonitorRequestTemplate(sql.FieldEQ(FieldAPIMode, v))
+}
+
+// APIModeNEQ applies the NEQ predicate on the "api_mode" field.
+func APIModeNEQ(v string) predicate.ChannelMonitorRequestTemplate {
+	return predicate.ChannelMonitorRequestTemplate(sql.FieldNEQ(FieldAPIMode, v))
+}
+
+// APIModeIn applies the In predicate on the "api_mode" field.
+func APIModeIn(vs ...string) predicate.ChannelMonitorRequestTemplate {
+	return predicate.ChannelMonitorRequestTemplate(sql.FieldIn(FieldAPIMode, vs...))
+}
+
+// APIModeNotIn applies the NotIn predicate on the "api_mode" field.
+func APIModeNotIn(vs ...string) predicate.ChannelMonitorRequestTemplate {
+	return predicate.ChannelMonitorRequestTemplate(sql.FieldNotIn(FieldAPIMode, vs...))
+}
+
+// APIModeGT applies the GT predicate on the "api_mode" field.
+func APIModeGT(v string) predicate.ChannelMonitorRequestTemplate {
+	return predicate.ChannelMonitorRequestTemplate(sql.FieldGT(FieldAPIMode, v))
+}
+
+// APIModeGTE applies the GTE predicate on the "api_mode" field.
+func APIModeGTE(v string) predicate.ChannelMonitorRequestTemplate {
+	return predicate.ChannelMonitorRequestTemplate(sql.FieldGTE(FieldAPIMode, v))
+}
+
+// APIModeLT applies the LT predicate on the "api_mode" field.
+func APIModeLT(v string) predicate.ChannelMonitorRequestTemplate {
+	return predicate.ChannelMonitorRequestTemplate(sql.FieldLT(FieldAPIMode, v))
+}
+
+// APIModeLTE applies the LTE predicate on the "api_mode" field.
+func APIModeLTE(v string) predicate.ChannelMonitorRequestTemplate {
+	return predicate.ChannelMonitorRequestTemplate(sql.FieldLTE(FieldAPIMode, v))
+}
+
+// APIModeContains applies the Contains predicate on the "api_mode" field.
+func APIModeContains(v string) predicate.ChannelMonitorRequestTemplate {
+	return predicate.ChannelMonitorRequestTemplate(sql.FieldContains(FieldAPIMode, v))
+}
+
+// APIModeHasPrefix applies the HasPrefix predicate on the "api_mode" field.
+func APIModeHasPrefix(v string) predicate.ChannelMonitorRequestTemplate {
+	return predicate.ChannelMonitorRequestTemplate(sql.FieldHasPrefix(FieldAPIMode, v))
+}
+
+// APIModeHasSuffix applies the HasSuffix predicate on the "api_mode" field.
+func APIModeHasSuffix(v string) predicate.ChannelMonitorRequestTemplate {
+	return predicate.ChannelMonitorRequestTemplate(sql.FieldHasSuffix(FieldAPIMode, v))
+}
+
+// APIModeEqualFold applies the EqualFold predicate on the "api_mode" field.
+func APIModeEqualFold(v string) predicate.ChannelMonitorRequestTemplate {
+	return predicate.ChannelMonitorRequestTemplate(sql.FieldEqualFold(FieldAPIMode, v))
+}
+
+// APIModeContainsFold applies the ContainsFold predicate on the "api_mode" field.
+func APIModeContainsFold(v string) predicate.ChannelMonitorRequestTemplate {
+	return predicate.ChannelMonitorRequestTemplate(sql.FieldContainsFold(FieldAPIMode, v))
+}
+
 // DescriptionEQ applies the EQ predicate on the "description" field.
 func DescriptionEQ(v string) predicate.ChannelMonitorRequestTemplate {
 	return predicate.ChannelMonitorRequestTemplate(sql.FieldEQ(FieldDescription, v))
diff --git a/backend/ent/channelmonitorrequesttemplate_create.go b/backend/ent/channelmonitorrequesttemplate_create.go
index 1ba842cd..45405270 100644
--- a/backend/ent/channelmonitorrequesttemplate_create.go
+++ b/backend/ent/channelmonitorrequesttemplate_create.go
@@ -63,6 +63,20 @@ func (_c *ChannelMonitorRequestTemplateCreate) SetProvider(v channelmonitorreque
 	return _c
 }
 
+// SetAPIMode sets the "api_mode" field.
+func (_c *ChannelMonitorRequestTemplateCreate) SetAPIMode(v string) *ChannelMonitorRequestTemplateCreate {
+	_c.mutation.SetAPIMode(v)
+	return _c
+}
+
+// SetNillableAPIMode sets the "api_mode" field if the given value is not nil.
+func (_c *ChannelMonitorRequestTemplateCreate) SetNillableAPIMode(v *string) *ChannelMonitorRequestTemplateCreate {
+	if v != nil {
+		_c.SetAPIMode(*v)
+	}
+	return _c
+}
+
 // SetDescription sets the "description" field.
 func (_c *ChannelMonitorRequestTemplateCreate) SetDescription(v string) *ChannelMonitorRequestTemplateCreate {
 	_c.mutation.SetDescription(v)
@@ -161,6 +175,10 @@ func (_c *ChannelMonitorRequestTemplateCreate) defaults() {
 		v := channelmonitorrequesttemplate.DefaultUpdatedAt()
 		_c.mutation.SetUpdatedAt(v)
 	}
+	if _, ok := _c.mutation.APIMode(); !ok {
+		v := channelmonitorrequesttemplate.DefaultAPIMode
+		_c.mutation.SetAPIMode(v)
+	}
 	if _, ok := _c.mutation.Description(); !ok {
 		v := channelmonitorrequesttemplate.DefaultDescription
 		_c.mutation.SetDescription(v)
@@ -199,6 +217,14 @@ func (_c *ChannelMonitorRequestTemplateCreate) check() error {
 			return &ValidationError{Name: "provider", err: fmt.Errorf(`ent: validator failed for field "ChannelMonitorRequestTemplate.provider": %w`, err)}
 		}
 	}
+	if _, ok := _c.mutation.APIMode(); !ok {
+		return &ValidationError{Name: "api_mode", err: errors.New(`ent: missing required field "ChannelMonitorRequestTemplate.api_mode"`)}
+	}
+	if v, ok := _c.mutation.APIMode(); ok {
+		if err := channelmonitorrequesttemplate.APIModeValidator(v); err != nil {
+			return &ValidationError{Name: "api_mode", err: fmt.Errorf(`ent: validator failed for field "ChannelMonitorRequestTemplate.api_mode": %w`, err)}
+		}
+	}
 	if v, ok := _c.mutation.Description(); ok {
 		if err := channelmonitorrequesttemplate.DescriptionValidator(v); err != nil {
 			return &ValidationError{Name: "description", err: fmt.Errorf(`ent: validator failed for field "ChannelMonitorRequestTemplate.description": %w`, err)}
@@ -258,6 +284,10 @@ func (_c *ChannelMonitorRequestTemplateCreate) createSpec() (*ChannelMonitorRequ
 		_spec.SetField(channelmonitorrequesttemplate.FieldProvider, field.TypeEnum, value)
 		_node.Provider = value
 	}
+	if value, ok := _c.mutation.APIMode(); ok {
+		_spec.SetField(channelmonitorrequesttemplate.FieldAPIMode, field.TypeString, value)
+		_node.APIMode = value
+	}
 	if value, ok := _c.mutation.Description(); ok {
 		_spec.SetField(channelmonitorrequesttemplate.FieldDescription, field.TypeString, value)
 		_node.Description = value
@@ -378,6 +408,18 @@ func (u *ChannelMonitorRequestTemplateUpsert) UpdateProvider() *ChannelMonitorRe
 	return u
 }
 
+// SetAPIMode sets the "api_mode" field.
+func (u *ChannelMonitorRequestTemplateUpsert) SetAPIMode(v string) *ChannelMonitorRequestTemplateUpsert {
+	u.Set(channelmonitorrequesttemplate.FieldAPIMode, v)
+	return u
+}
+
+// UpdateAPIMode sets the "api_mode" field to the value that was provided on create.
+func (u *ChannelMonitorRequestTemplateUpsert) UpdateAPIMode() *ChannelMonitorRequestTemplateUpsert {
+	u.SetExcluded(channelmonitorrequesttemplate.FieldAPIMode)
+	return u
+}
+
 // SetDescription sets the "description" field.
 func (u *ChannelMonitorRequestTemplateUpsert) SetDescription(v string) *ChannelMonitorRequestTemplateUpsert {
 	u.Set(channelmonitorrequesttemplate.FieldDescription, v)
@@ -525,6 +567,20 @@ func (u *ChannelMonitorRequestTemplateUpsertOne) UpdateProvider() *ChannelMonito
 	})
 }
 
+// SetAPIMode sets the "api_mode" field.
+func (u *ChannelMonitorRequestTemplateUpsertOne) SetAPIMode(v string) *ChannelMonitorRequestTemplateUpsertOne {
+	return u.Update(func(s *ChannelMonitorRequestTemplateUpsert) {
+		s.SetAPIMode(v)
+	})
+}
+
+// UpdateAPIMode sets the "api_mode" field to the value that was provided on create.
+func (u *ChannelMonitorRequestTemplateUpsertOne) UpdateAPIMode() *ChannelMonitorRequestTemplateUpsertOne {
+	return u.Update(func(s *ChannelMonitorRequestTemplateUpsert) {
+		s.UpdateAPIMode()
+	})
+}
+
 // SetDescription sets the "description" field.
 func (u *ChannelMonitorRequestTemplateUpsertOne) SetDescription(v string) *ChannelMonitorRequestTemplateUpsertOne {
 	return u.Update(func(s *ChannelMonitorRequestTemplateUpsert) {
@@ -848,6 +904,20 @@ func (u *ChannelMonitorRequestTemplateUpsertBulk) UpdateProvider() *ChannelMonit
 	})
 }
 
+// SetAPIMode sets the "api_mode" field.
+func (u *ChannelMonitorRequestTemplateUpsertBulk) SetAPIMode(v string) *ChannelMonitorRequestTemplateUpsertBulk {
+	return u.Update(func(s *ChannelMonitorRequestTemplateUpsert) {
+		s.SetAPIMode(v)
+	})
+}
+
+// UpdateAPIMode sets the "api_mode" field to the value that was provided on create.
+func (u *ChannelMonitorRequestTemplateUpsertBulk) UpdateAPIMode() *ChannelMonitorRequestTemplateUpsertBulk {
+	return u.Update(func(s *ChannelMonitorRequestTemplateUpsert) {
+		s.UpdateAPIMode()
+	})
+}
+
 // SetDescription sets the "description" field.
 func (u *ChannelMonitorRequestTemplateUpsertBulk) SetDescription(v string) *ChannelMonitorRequestTemplateUpsertBulk {
 	return u.Update(func(s *ChannelMonitorRequestTemplateUpsert) {
diff --git a/backend/ent/channelmonitorrequesttemplate_update.go b/backend/ent/channelmonitorrequesttemplate_update.go
index 8f55ba04..f27cac1c 100644
--- a/backend/ent/channelmonitorrequesttemplate_update.go
+++ b/backend/ent/channelmonitorrequesttemplate_update.go
@@ -63,6 +63,20 @@ func (_u *ChannelMonitorRequestTemplateUpdate) SetNillableProvider(v *channelmon
 	return _u
 }
 
+// SetAPIMode sets the "api_mode" field.
+func (_u *ChannelMonitorRequestTemplateUpdate) SetAPIMode(v string) *ChannelMonitorRequestTemplateUpdate {
+	_u.mutation.SetAPIMode(v)
+	return _u
+}
+
+// SetNillableAPIMode sets the "api_mode" field if the given value is not nil.
+func (_u *ChannelMonitorRequestTemplateUpdate) SetNillableAPIMode(v *string) *ChannelMonitorRequestTemplateUpdate {
+	if v != nil {
+		_u.SetAPIMode(*v)
+	}
+	return _u
+}
+
 // SetDescription sets the "description" field.
 func (_u *ChannelMonitorRequestTemplateUpdate) SetDescription(v string) *ChannelMonitorRequestTemplateUpdate {
 	_u.mutation.SetDescription(v)
@@ -204,6 +218,11 @@ func (_u *ChannelMonitorRequestTemplateUpdate) check() error {
 			return &ValidationError{Name: "provider", err: fmt.Errorf(`ent: validator failed for field "ChannelMonitorRequestTemplate.provider": %w`, err)}
 		}
 	}
+	if v, ok := _u.mutation.APIMode(); ok {
+		if err := channelmonitorrequesttemplate.APIModeValidator(v); err != nil {
+			return &ValidationError{Name: "api_mode", err: fmt.Errorf(`ent: validator failed for field "ChannelMonitorRequestTemplate.api_mode": %w`, err)}
+		}
+	}
 	if v, ok := _u.mutation.Description(); ok {
 		if err := channelmonitorrequesttemplate.DescriptionValidator(v); err != nil {
 			return &ValidationError{Name: "description", err: fmt.Errorf(`ent: validator failed for field "ChannelMonitorRequestTemplate.description": %w`, err)}
@@ -238,6 +257,9 @@ func (_u *ChannelMonitorRequestTemplateUpdate) sqlSave(ctx context.Context) (_no
 	if value, ok := _u.mutation.Provider(); ok {
 		_spec.SetField(channelmonitorrequesttemplate.FieldProvider, field.TypeEnum, value)
 	}
+	if value, ok := _u.mutation.APIMode(); ok {
+		_spec.SetField(channelmonitorrequesttemplate.FieldAPIMode, field.TypeString, value)
+	}
 	if value, ok := _u.mutation.Description(); ok {
 		_spec.SetField(channelmonitorrequesttemplate.FieldDescription, field.TypeString, value)
 	}
@@ -355,6 +377,20 @@ func (_u *ChannelMonitorRequestTemplateUpdateOne) SetNillableProvider(v *channel
 	return _u
 }
 
+// SetAPIMode sets the "api_mode" field.
+func (_u *ChannelMonitorRequestTemplateUpdateOne) SetAPIMode(v string) *ChannelMonitorRequestTemplateUpdateOne {
+	_u.mutation.SetAPIMode(v)
+	return _u
+}
+
+// SetNillableAPIMode sets the "api_mode" field if the given value is not nil.
+func (_u *ChannelMonitorRequestTemplateUpdateOne) SetNillableAPIMode(v *string) *ChannelMonitorRequestTemplateUpdateOne {
+	if v != nil {
+		_u.SetAPIMode(*v)
+	}
+	return _u
+}
+
 // SetDescription sets the "description" field.
 func (_u *ChannelMonitorRequestTemplateUpdateOne) SetDescription(v string) *ChannelMonitorRequestTemplateUpdateOne {
 	_u.mutation.SetDescription(v)
@@ -509,6 +545,11 @@ func (_u *ChannelMonitorRequestTemplateUpdateOne) check() error {
 			return &ValidationError{Name: "provider", err: fmt.Errorf(`ent: validator failed for field "ChannelMonitorRequestTemplate.provider": %w`, err)}
 		}
 	}
+	if v, ok := _u.mutation.APIMode(); ok {
+		if err := channelmonitorrequesttemplate.APIModeValidator(v); err != nil {
+			return &ValidationError{Name: "api_mode", err: fmt.Errorf(`ent: validator failed for field "ChannelMonitorRequestTemplate.api_mode": %w`, err)}
+		}
+	}
 	if v, ok := _u.mutation.Description(); ok {
 		if err := channelmonitorrequesttemplate.DescriptionValidator(v); err != nil {
 			return &ValidationError{Name: "description", err: fmt.Errorf(`ent: validator failed for field "ChannelMonitorRequestTemplate.description": %w`, err)}
@@ -560,6 +601,9 @@ func (_u *ChannelMonitorRequestTemplateUpdateOne) sqlSave(ctx context.Context) (
 	if value, ok := _u.mutation.Provider(); ok {
 		_spec.SetField(channelmonitorrequesttemplate.FieldProvider, field.TypeEnum, value)
 	}
+	if value, ok := _u.mutation.APIMode(); ok {
+		_spec.SetField(channelmonitorrequesttemplate.FieldAPIMode, field.TypeString, value)
+	}
 	if value, ok := _u.mutation.Description(); ok {
 		_spec.SetField(channelmonitorrequesttemplate.FieldDescription, field.TypeString, value)
 	}
diff --git a/backend/ent/migrate/schema.go b/backend/ent/migrate/schema.go
index f98761ea..b1731a35 100644
--- a/backend/ent/migrate/schema.go
+++ b/backend/ent/migrate/schema.go
@@ -428,6 +428,7 @@ var (
 		{Name: "updated_at", Type: field.TypeTime, SchemaType: map[string]string{"postgres": "timestamptz"}},
 		{Name: "name", Type: field.TypeString, Size: 100},
 		{Name: "provider", Type: field.TypeEnum, Enums: []string{"openai", "anthropic", "gemini"}},
+		{Name: "api_mode", Type: field.TypeString, Size: 32, Default: "chat_completions"},
 		{Name: "endpoint", Type: field.TypeString, Size: 500},
 		{Name: "api_key_encrypted", Type: field.TypeString},
 		{Name: "primary_model", Type: field.TypeString, Size: 200},
@@ -450,7 +451,7 @@ var (
 		ForeignKeys: []*schema.ForeignKey{
 			{
 				Symbol:     "channel_monitors_channel_monitor_request_templates_request_template",
-				Columns:    []*schema.Column{ChannelMonitorsColumns[17]},
+				Columns:    []*schema.Column{ChannelMonitorsColumns[18]},
 				RefColumns: []*schema.Column{ChannelMonitorRequestTemplatesColumns[0]},
 				OnDelete:   schema.SetNull,
 			},
@@ -459,22 +460,27 @@ var (
 			{
 				Name:    "channelmonitor_enabled_last_checked_at",
 				Unique:  false,
-				Columns: []*schema.Column{ChannelMonitorsColumns[10], ChannelMonitorsColumns[12]},
+				Columns: []*schema.Column{ChannelMonitorsColumns[11], ChannelMonitorsColumns[13]},
 			},
 			{
 				Name:    "channelmonitor_provider",
 				Unique:  false,
 				Columns: []*schema.Column{ChannelMonitorsColumns[4]},
 			},
+			{
+				Name:    "channelmonitor_provider_api_mode",
+				Unique:  false,
+				Columns: []*schema.Column{ChannelMonitorsColumns[4], ChannelMonitorsColumns[5]},
+			},
 			{
 				Name:    "channelmonitor_group_name",
 				Unique:  false,
-				Columns: []*schema.Column{ChannelMonitorsColumns[9]},
+				Columns: []*schema.Column{ChannelMonitorsColumns[10]},
 			},
 			{
 				Name:    "channelmonitor_template_id",
 				Unique:  false,
-				Columns: []*schema.Column{ChannelMonitorsColumns[17]},
+				Columns: []*schema.Column{ChannelMonitorsColumns[18]},
 			},
 		},
 	}
@@ -566,6 +572,7 @@ var (
 		{Name: "updated_at", Type: field.TypeTime, SchemaType: map[string]string{"postgres": "timestamptz"}},
 		{Name: "name", Type: field.TypeString, Size: 100},
 		{Name: "provider", Type: field.TypeEnum, Enums: []string{"openai", "anthropic", "gemini"}},
+		{Name: "api_mode", Type: field.TypeString, Size: 32, Default: "chat_completions"},
 		{Name: "description", Type: field.TypeString, Nullable: true, Size: 500, Default: ""},
 		{Name: "extra_headers", Type: field.TypeJSON},
 		{Name: "body_override_mode", Type: field.TypeString, Size: 10, Default: "off"},
@@ -582,6 +589,11 @@ var (
 				Unique:  true,
 				Columns: []*schema.Column{ChannelMonitorRequestTemplatesColumns[4], ChannelMonitorRequestTemplatesColumns[3]},
 			},
+			{
+				Name:    "channelmonitorrequesttemplate_provider_api_mode",
+				Unique:  false,
+				Columns: []*schema.Column{ChannelMonitorRequestTemplatesColumns[4], ChannelMonitorRequestTemplatesColumns[5]},
+			},
 		},
 	}
 	// ErrorPassthroughRulesColumns holds the columns for the "error_passthrough_rules" table.
diff --git a/backend/ent/mutation.go b/backend/ent/mutation.go
index 45c56314..af0edc68 100644
--- a/backend/ent/mutation.go
+++ b/backend/ent/mutation.go
@@ -8752,6 +8752,7 @@ type ChannelMonitorMutation struct {
 	updated_at              *time.Time
 	name                    *string
 	provider                *channelmonitor.Provider
+	api_mode                *string
 	endpoint                *string
 	api_key_encrypted       *string
 	primary_model           *string
@@ -9023,6 +9024,42 @@ func (m *ChannelMonitorMutation) ResetProvider() {
 	m.provider = nil
 }
 
+// SetAPIMode sets the "api_mode" field.
+func (m *ChannelMonitorMutation) SetAPIMode(s string) {
+	m.api_mode = &s
+}
+
+// APIMode returns the value of the "api_mode" field in the mutation.
+func (m *ChannelMonitorMutation) APIMode() (r string, exists bool) {
+	v := m.api_mode
+	if v == nil {
+		return
+	}
+	return *v, true
+}
+
+// OldAPIMode returns the old "api_mode" field's value of the ChannelMonitor entity.
+// If the ChannelMonitor object wasn't provided to the builder, the object is fetched from the database.
+// An error is returned if the mutation operation is not UpdateOne, or the database query fails.
+func (m *ChannelMonitorMutation) OldAPIMode(ctx context.Context) (v string, err error) {
+	if !m.op.Is(OpUpdateOne) {
+		return v, errors.New("OldAPIMode is only allowed on UpdateOne operations")
+	}
+	if m.id == nil || m.oldValue == nil {
+		return v, errors.New("OldAPIMode requires an ID field in the mutation")
+	}
+	oldValue, err := m.oldValue(ctx)
+	if err != nil {
+		return v, fmt.Errorf("querying old value for OldAPIMode: %w", err)
+	}
+	return oldValue.APIMode, nil
+}
+
+// ResetAPIMode resets all changes to the "api_mode" field.
+func (m *ChannelMonitorMutation) ResetAPIMode() {
+	m.api_mode = nil
+}
+
 // SetEndpoint sets the "endpoint" field.
 func (m *ChannelMonitorMutation) SetEndpoint(s string) {
 	m.endpoint = &s
@@ -9780,7 +9817,7 @@ func (m *ChannelMonitorMutation) Type() string {
 // order to get all numeric fields that were incremented/decremented, call
 // AddedFields().
 func (m *ChannelMonitorMutation) Fields() []string {
-	fields := make([]string, 0, 17)
+	fields := make([]string, 0, 18)
 	if m.created_at != nil {
 		fields = append(fields, channelmonitor.FieldCreatedAt)
 	}
@@ -9793,6 +9830,9 @@ func (m *ChannelMonitorMutation) Fields() []string {
 	if m.provider != nil {
 		fields = append(fields, channelmonitor.FieldProvider)
 	}
+	if m.api_mode != nil {
+		fields = append(fields, channelmonitor.FieldAPIMode)
+	}
 	if m.endpoint != nil {
 		fields = append(fields, channelmonitor.FieldEndpoint)
 	}
@@ -9848,6 +9888,8 @@ func (m *ChannelMonitorMutation) Field(name string) (ent.Value, bool) {
 		return m.Name()
 	case channelmonitor.FieldProvider:
 		return m.Provider()
+	case channelmonitor.FieldAPIMode:
+		return m.APIMode()
 	case channelmonitor.FieldEndpoint:
 		return m.Endpoint()
 	case channelmonitor.FieldAPIKeyEncrypted:
@@ -9891,6 +9933,8 @@ func (m *ChannelMonitorMutation) OldField(ctx context.Context, name string) (ent
 		return m.OldName(ctx)
 	case channelmonitor.FieldProvider:
 		return m.OldProvider(ctx)
+	case channelmonitor.FieldAPIMode:
+		return m.OldAPIMode(ctx)
 	case channelmonitor.FieldEndpoint:
 		return m.OldEndpoint(ctx)
 	case channelmonitor.FieldAPIKeyEncrypted:
@@ -9954,6 +9998,13 @@ func (m *ChannelMonitorMutation) SetField(name string, value ent.Value) error {
 		}
 		m.SetProvider(v)
 		return nil
+	case channelmonitor.FieldAPIMode:
+		v, ok := value.(string)
+		if !ok {
+			return fmt.Errorf("unexpected type %T for field %s", value, name)
+		}
+		m.SetAPIMode(v)
+		return nil
 	case channelmonitor.FieldEndpoint:
 		v, ok := value.(string)
 		if !ok {
@@ -10160,6 +10211,9 @@ func (m *ChannelMonitorMutation) ResetField(name string) error {
 	case channelmonitor.FieldProvider:
 		m.ResetProvider()
 		return nil
+	case channelmonitor.FieldAPIMode:
+		m.ResetAPIMode()
+		return nil
 	case channelmonitor.FieldEndpoint:
 		m.ResetEndpoint()
 		return nil
@@ -12591,6 +12645,7 @@ type ChannelMonitorRequestTemplateMutation struct {
 	updated_at         *time.Time
 	name               *string
 	provider           *channelmonitorrequesttemplate.Provider
+	api_mode           *string
 	description        *string
 	extra_headers      *map[string]string
 	body_override_mode *string
@@ -12846,6 +12901,42 @@ func (m *ChannelMonitorRequestTemplateMutation) ResetProvider() {
 	m.provider = nil
 }
 
+// SetAPIMode sets the "api_mode" field.
+func (m *ChannelMonitorRequestTemplateMutation) SetAPIMode(s string) {
+	m.api_mode = &s
+}
+
+// APIMode returns the value of the "api_mode" field in the mutation.
+func (m *ChannelMonitorRequestTemplateMutation) APIMode() (r string, exists bool) {
+	v := m.api_mode
+	if v == nil {
+		return
+	}
+	return *v, true
+}
+
+// OldAPIMode returns the old "api_mode" field's value of the ChannelMonitorRequestTemplate entity.
+// If the ChannelMonitorRequestTemplate object wasn't provided to the builder, the object is fetched from the database.
+// An error is returned if the mutation operation is not UpdateOne, or the database query fails.
+func (m *ChannelMonitorRequestTemplateMutation) OldAPIMode(ctx context.Context) (v string, err error) {
+	if !m.op.Is(OpUpdateOne) {
+		return v, errors.New("OldAPIMode is only allowed on UpdateOne operations")
+	}
+	if m.id == nil || m.oldValue == nil {
+		return v, errors.New("OldAPIMode requires an ID field in the mutation")
+	}
+	oldValue, err := m.oldValue(ctx)
+	if err != nil {
+		return v, fmt.Errorf("querying old value for OldAPIMode: %w", err)
+	}
+	return oldValue.APIMode, nil
+}
+
+// ResetAPIMode resets all changes to the "api_mode" field.
+func (m *ChannelMonitorRequestTemplateMutation) ResetAPIMode() {
+	m.api_mode = nil
+}
+
 // SetDescription sets the "description" field.
 func (m *ChannelMonitorRequestTemplateMutation) SetDescription(s string) {
 	m.description = &s
@@ -13104,7 +13195,7 @@ func (m *ChannelMonitorRequestTemplateMutation) Type() string {
 // order to get all numeric fields that were incremented/decremented, call
 // AddedFields().
 func (m *ChannelMonitorRequestTemplateMutation) Fields() []string {
-	fields := make([]string, 0, 8)
+	fields := make([]string, 0, 9)
 	if m.created_at != nil {
 		fields = append(fields, channelmonitorrequesttemplate.FieldCreatedAt)
 	}
@@ -13117,6 +13208,9 @@ func (m *ChannelMonitorRequestTemplateMutation) Fields() []string {
 	if m.provider != nil {
 		fields = append(fields, channelmonitorrequesttemplate.FieldProvider)
 	}
+	if m.api_mode != nil {
+		fields = append(fields, channelmonitorrequesttemplate.FieldAPIMode)
+	}
 	if m.description != nil {
 		fields = append(fields, channelmonitorrequesttemplate.FieldDescription)
 	}
@@ -13145,6 +13239,8 @@ func (m *ChannelMonitorRequestTemplateMutation) Field(name string) (ent.Value, b
 		return m.Name()
 	case channelmonitorrequesttemplate.FieldProvider:
 		return m.Provider()
+	case channelmonitorrequesttemplate.FieldAPIMode:
+		return m.APIMode()
 	case channelmonitorrequesttemplate.FieldDescription:
 		return m.Description()
 	case channelmonitorrequesttemplate.FieldExtraHeaders:
@@ -13170,6 +13266,8 @@ func (m *ChannelMonitorRequestTemplateMutation) OldField(ctx context.Context, na
 		return m.OldName(ctx)
 	case channelmonitorrequesttemplate.FieldProvider:
 		return m.OldProvider(ctx)
+	case channelmonitorrequesttemplate.FieldAPIMode:
+		return m.OldAPIMode(ctx)
 	case channelmonitorrequesttemplate.FieldDescription:
 		return m.OldDescription(ctx)
 	case channelmonitorrequesttemplate.FieldExtraHeaders:
@@ -13215,6 +13313,13 @@ func (m *ChannelMonitorRequestTemplateMutation) SetField(name string, value ent.
 		}
 		m.SetProvider(v)
 		return nil
+	case channelmonitorrequesttemplate.FieldAPIMode:
+		v, ok := value.(string)
+		if !ok {
+			return fmt.Errorf("unexpected type %T for field %s", value, name)
+		}
+		m.SetAPIMode(v)
+		return nil
 	case channelmonitorrequesttemplate.FieldDescription:
 		v, ok := value.(string)
 		if !ok {
@@ -13319,6 +13424,9 @@ func (m *ChannelMonitorRequestTemplateMutation) ResetField(name string) error {
 	case channelmonitorrequesttemplate.FieldProvider:
 		m.ResetProvider()
 		return nil
+	case channelmonitorrequesttemplate.FieldAPIMode:
+		m.ResetAPIMode()
+		return nil
 	case channelmonitorrequesttemplate.FieldDescription:
 		m.ResetDescription()
 		return nil
diff --git a/backend/ent/runtime/runtime.go b/backend/ent/runtime/runtime.go
index b1899173..6d541e2f 100644
--- a/backend/ent/runtime/runtime.go
+++ b/backend/ent/runtime/runtime.go
@@ -464,8 +464,14 @@ func init() {
 			return nil
 		}
 	}()
+	// channelmonitorDescAPIMode is the schema descriptor for api_mode field.
+	channelmonitorDescAPIMode := channelmonitorFields[2].Descriptor()
+	// channelmonitor.DefaultAPIMode holds the default value on creation for the api_mode field.
+	channelmonitor.DefaultAPIMode = channelmonitorDescAPIMode.Default.(string)
+	// channelmonitor.APIModeValidator is a validator for the "api_mode" field. It is called by the builders before save.
+	channelmonitor.APIModeValidator = channelmonitorDescAPIMode.Validators[0].(func(string) error)
 	// channelmonitorDescEndpoint is the schema descriptor for endpoint field.
-	channelmonitorDescEndpoint := channelmonitorFields[2].Descriptor()
+	channelmonitorDescEndpoint := channelmonitorFields[3].Descriptor()
 	// channelmonitor.EndpointValidator is a validator for the "endpoint" field. It is called by the builders before save.
 	channelmonitor.EndpointValidator = func() func(string) error {
 		validators := channelmonitorDescEndpoint.Validators
@@ -483,11 +489,11 @@ func init() {
 		}
 	}()
 	// channelmonitorDescAPIKeyEncrypted is the schema descriptor for api_key_encrypted field.
-	channelmonitorDescAPIKeyEncrypted := channelmonitorFields[3].Descriptor()
+	channelmonitorDescAPIKeyEncrypted := channelmonitorFields[4].Descriptor()
 	// channelmonitor.APIKeyEncryptedValidator is a validator for the "api_key_encrypted" field. It is called by the builders before save.
 	channelmonitor.APIKeyEncryptedValidator = channelmonitorDescAPIKeyEncrypted.Validators[0].(func(string) error)
 	// channelmonitorDescPrimaryModel is the schema descriptor for primary_model field.
-	channelmonitorDescPrimaryModel := channelmonitorFields[4].Descriptor()
+	channelmonitorDescPrimaryModel := channelmonitorFields[5].Descriptor()
 	// channelmonitor.PrimaryModelValidator is a validator for the "primary_model" field. It is called by the builders before save.
 	channelmonitor.PrimaryModelValidator = func() func(string) error {
 		validators := channelmonitorDescPrimaryModel.Validators
@@ -505,29 +511,29 @@ func init() {
 		}
 	}()
 	// channelmonitorDescExtraModels is the schema descriptor for extra_models field.
-	channelmonitorDescExtraModels := channelmonitorFields[5].Descriptor()
+	channelmonitorDescExtraModels := channelmonitorFields[6].Descriptor()
 	// channelmonitor.DefaultExtraModels holds the default value on creation for the extra_models field.
 	channelmonitor.DefaultExtraModels = channelmonitorDescExtraModels.Default.([]string)
 	// channelmonitorDescGroupName is the schema descriptor for group_name field.
-	channelmonitorDescGroupName := channelmonitorFields[6].Descriptor()
+	channelmonitorDescGroupName := channelmonitorFields[7].Descriptor()
 	// channelmonitor.DefaultGroupName holds the default value on creation for the group_name field.
 	channelmonitor.DefaultGroupName = channelmonitorDescGroupName.Default.(string)
 	// channelmonitor.GroupNameValidator is a validator for the "group_name" field. It is called by the builders before save.
 	channelmonitor.GroupNameValidator = channelmonitorDescGroupName.Validators[0].(func(string) error)
 	// channelmonitorDescEnabled is the schema descriptor for enabled field.
-	channelmonitorDescEnabled := channelmonitorFields[7].Descriptor()
+	channelmonitorDescEnabled := channelmonitorFields[8].Descriptor()
 	// channelmonitor.DefaultEnabled holds the default value on creation for the enabled field.
 	channelmonitor.DefaultEnabled = channelmonitorDescEnabled.Default.(bool)
 	// channelmonitorDescIntervalSeconds is the schema descriptor for interval_seconds field.
-	channelmonitorDescIntervalSeconds := channelmonitorFields[8].Descriptor()
+	channelmonitorDescIntervalSeconds := channelmonitorFields[9].Descriptor()
 	// channelmonitor.IntervalSecondsValidator is a validator for the "interval_seconds" field. It is called by the builders before save.
 	channelmonitor.IntervalSecondsValidator = channelmonitorDescIntervalSeconds.Validators[0].(func(int) error)
 	// channelmonitorDescExtraHeaders is the schema descriptor for extra_headers field.
-	channelmonitorDescExtraHeaders := channelmonitorFields[12].Descriptor()
+	channelmonitorDescExtraHeaders := channelmonitorFields[13].Descriptor()
 	// channelmonitor.DefaultExtraHeaders holds the default value on creation for the extra_headers field.
 	channelmonitor.DefaultExtraHeaders = channelmonitorDescExtraHeaders.Default.(map[string]string)
 	// channelmonitorDescBodyOverrideMode is the schema descriptor for body_override_mode field.
-	channelmonitorDescBodyOverrideMode := channelmonitorFields[13].Descriptor()
+	channelmonitorDescBodyOverrideMode := channelmonitorFields[14].Descriptor()
 	// channelmonitor.DefaultBodyOverrideMode holds the default value on creation for the body_override_mode field.
 	channelmonitor.DefaultBodyOverrideMode = channelmonitorDescBodyOverrideMode.Default.(string)
 	// channelmonitor.BodyOverrideModeValidator is a validator for the "body_override_mode" field. It is called by the builders before save.
@@ -661,18 +667,24 @@ func init() {
 			return nil
 		}
 	}()
+	// channelmonitorrequesttemplateDescAPIMode is the schema descriptor for api_mode field.
+	channelmonitorrequesttemplateDescAPIMode := channelmonitorrequesttemplateFields[2].Descriptor()
+	// channelmonitorrequesttemplate.DefaultAPIMode holds the default value on creation for the api_mode field.
+	channelmonitorrequesttemplate.DefaultAPIMode = channelmonitorrequesttemplateDescAPIMode.Default.(string)
+	// channelmonitorrequesttemplate.APIModeValidator is a validator for the "api_mode" field. It is called by the builders before save.
+	channelmonitorrequesttemplate.APIModeValidator = channelmonitorrequesttemplateDescAPIMode.Validators[0].(func(string) error)
 	// channelmonitorrequesttemplateDescDescription is the schema descriptor for description field.
-	channelmonitorrequesttemplateDescDescription := channelmonitorrequesttemplateFields[2].Descriptor()
+	channelmonitorrequesttemplateDescDescription := channelmonitorrequesttemplateFields[3].Descriptor()
 	// channelmonitorrequesttemplate.DefaultDescription holds the default value on creation for the description field.
 	channelmonitorrequesttemplate.DefaultDescription = channelmonitorrequesttemplateDescDescription.Default.(string)
 	// channelmonitorrequesttemplate.DescriptionValidator is a validator for the "description" field. It is called by the builders before save.
 	channelmonitorrequesttemplate.DescriptionValidator = channelmonitorrequesttemplateDescDescription.Validators[0].(func(string) error)
 	// channelmonitorrequesttemplateDescExtraHeaders is the schema descriptor for extra_headers field.
-	channelmonitorrequesttemplateDescExtraHeaders := channelmonitorrequesttemplateFields[3].Descriptor()
+	channelmonitorrequesttemplateDescExtraHeaders := channelmonitorrequesttemplateFields[4].Descriptor()
 	// channelmonitorrequesttemplate.DefaultExtraHeaders holds the default value on creation for the extra_headers field.
 	channelmonitorrequesttemplate.DefaultExtraHeaders = channelmonitorrequesttemplateDescExtraHeaders.Default.(map[string]string)
 	// channelmonitorrequesttemplateDescBodyOverrideMode is the schema descriptor for body_override_mode field.
-	channelmonitorrequesttemplateDescBodyOverrideMode := channelmonitorrequesttemplateFields[4].Descriptor()
+	channelmonitorrequesttemplateDescBodyOverrideMode := channelmonitorrequesttemplateFields[5].Descriptor()
 	// channelmonitorrequesttemplate.DefaultBodyOverrideMode holds the default value on creation for the body_override_mode field.
 	channelmonitorrequesttemplate.DefaultBodyOverrideMode = channelmonitorrequesttemplateDescBodyOverrideMode.Default.(string)
 	// channelmonitorrequesttemplate.BodyOverrideModeValidator is a validator for the "body_override_mode" field. It is called by the builders before save.
diff --git a/backend/ent/schema/channel_monitor.go b/backend/ent/schema/channel_monitor.go
index 355ade4b..431ab9c8 100644
--- a/backend/ent/schema/channel_monitor.go
+++ b/backend/ent/schema/channel_monitor.go
@@ -36,6 +36,10 @@ func (ChannelMonitor) Fields() []ent.Field {
 			MaxLen(100),
 		field.Enum("provider").
 			Values("openai", "anthropic", "gemini"),
+		field.String("api_mode").
+			Default("chat_completions").
+			MaxLen(32).
+			Comment("OpenAI request protocol: chat_completions or responses; non-OpenAI uses chat_completions"),
 		field.String("endpoint").
 			NotEmpty().
 			MaxLen(500).
@@ -104,6 +108,7 @@ func (ChannelMonitor) Indexes() []ent.Index {
 	return []ent.Index{
 		index.Fields("enabled", "last_checked_at"),
 		index.Fields("provider"),
+		index.Fields("provider", "api_mode"),
 		index.Fields("group_name"),
 		index.Fields("template_id"),
 	}
diff --git a/backend/ent/schema/channel_monitor_request_template.go b/backend/ent/schema/channel_monitor_request_template.go
index 59df2f29..0e0ce3a0 100644
--- a/backend/ent/schema/channel_monitor_request_template.go
+++ b/backend/ent/schema/channel_monitor_request_template.go
@@ -40,6 +40,10 @@ func (ChannelMonitorRequestTemplate) Fields() []ent.Field {
 			MaxLen(100),
 		field.Enum("provider").
 			Values("openai", "anthropic", "gemini"),
+		field.String("api_mode").
+			Default("chat_completions").
+			MaxLen(32).
+			Comment("OpenAI request protocol: chat_completions or responses; non-OpenAI uses chat_completions"),
 		field.String("description").
 			Optional().
 			Default("").
@@ -76,5 +80,6 @@ func (ChannelMonitorRequestTemplate) Indexes() []ent.Index {
 	return []ent.Index{
 		// 同一 provider 内 name 唯一：允许 Anthropic + OpenAI 重名 "伪装官方客户端"。
 		index.Fields("provider", "name").Unique(),
+		index.Fields("provider", "api_mode"),
 	}
 }
diff --git a/backend/internal/handler/admin/channel_monitor_handler.go b/backend/internal/handler/admin/channel_monitor_handler.go
index e92c81fe..5560a513 100644
--- a/backend/internal/handler/admin/channel_monitor_handler.go
+++ b/backend/internal/handler/admin/channel_monitor_handler.go
@@ -38,6 +38,7 @@ func NewChannelMonitorHandler(monitorService *service.ChannelMonitorService) *Ch
 type channelMonitorCreateRequest struct {
 	Name             string            `json:"name" binding:"required,max=100"`
 	Provider         string            `json:"provider" binding:"required,oneof=openai anthropic gemini"`
+	APIMode          string            `json:"api_mode" binding:"omitempty,oneof=chat_completions responses"`
 	Endpoint         string            `json:"endpoint" binding:"required,max=500"`
 	APIKey           string            `json:"api_key" binding:"required,max=2000"`
 	PrimaryModel     string            `json:"primary_model" binding:"required,max=200"`
@@ -54,6 +55,7 @@ type channelMonitorCreateRequest struct {
 type channelMonitorUpdateRequest struct {
 	Name             *string            `json:"name" binding:"omitempty,max=100"`
 	Provider         *string            `json:"provider" binding:"omitempty,oneof=openai anthropic gemini"`
+	APIMode          *string            `json:"api_mode" binding:"omitempty,oneof=chat_completions responses"`
 	Endpoint         *string            `json:"endpoint" binding:"omitempty,max=500"`
 	APIKey           *string            `json:"api_key" binding:"omitempty,max=2000"`
 	PrimaryModel     *string            `json:"primary_model" binding:"omitempty,max=200"`
@@ -72,6 +74,7 @@ type channelMonitorResponse struct {
 	ID                  int64                                `json:"id"`
 	Name                string                               `json:"name"`
 	Provider            string                               `json:"provider"`
+	APIMode             string                               `json:"api_mode"`
 	Endpoint            string                               `json:"endpoint"`
 	APIKeyMasked        string                               `json:"api_key_masked"`
 	APIKeyDecryptFailed bool                                 `json:"api_key_decrypt_failed"`
@@ -138,6 +141,7 @@ func channelMonitorToResponse(m *service.ChannelMonitor) *channelMonitorResponse
 		ID:                  m.ID,
 		Name:                m.Name,
 		Provider:            m.Provider,
+		APIMode:             m.APIMode,
 		Endpoint:            m.Endpoint,
 		APIKeyMasked:        maskAPIKey(m.APIKey),
 		APIKeyDecryptFailed: m.APIKeyDecryptFailed,
@@ -303,6 +307,7 @@ func (h *ChannelMonitorHandler) Create(c *gin.Context) {
 	m, err := h.monitorService.Create(c.Request.Context(), service.ChannelMonitorCreateParams{
 		Name:             req.Name,
 		Provider:         req.Provider,
+		APIMode:          req.APIMode,
 		Endpoint:         req.Endpoint,
 		APIKey:           req.APIKey,
 		PrimaryModel:     req.PrimaryModel,
@@ -338,6 +343,7 @@ func (h *ChannelMonitorHandler) Update(c *gin.Context) {
 	m, err := h.monitorService.Update(c.Request.Context(), id, service.ChannelMonitorUpdateParams{
 		Name:             req.Name,
 		Provider:         req.Provider,
+		APIMode:          req.APIMode,
 		Endpoint:         req.Endpoint,
 		APIKey:           req.APIKey,
 		PrimaryModel:     req.PrimaryModel,
diff --git a/backend/internal/handler/admin/channel_monitor_template_handler.go b/backend/internal/handler/admin/channel_monitor_template_handler.go
index bebe0929..c842f465 100644
--- a/backend/internal/handler/admin/channel_monitor_template_handler.go
+++ b/backend/internal/handler/admin/channel_monitor_template_handler.go
@@ -27,6 +27,7 @@ func NewChannelMonitorRequestTemplateHandler(templateService *service.ChannelMon
 type channelMonitorTemplateCreateRequest struct {
 	Name             string            `json:"name" binding:"required,max=100"`
 	Provider         string            `json:"provider" binding:"required,oneof=openai anthropic gemini"`
+	APIMode          string            `json:"api_mode" binding:"omitempty,oneof=chat_completions responses"`
 	Description      string            `json:"description" binding:"max=500"`
 	ExtraHeaders     map[string]string `json:"extra_headers"`
 	BodyOverrideMode string            `json:"body_override_mode" binding:"omitempty,oneof=off merge replace"`
@@ -35,6 +36,7 @@ type channelMonitorTemplateCreateRequest struct {
 
 type channelMonitorTemplateUpdateRequest struct {
 	Name             *string            `json:"name" binding:"omitempty,max=100"`
+	APIMode          *string            `json:"api_mode" binding:"omitempty,oneof=chat_completions responses"`
 	Description      *string            `json:"description" binding:"omitempty,max=500"`
 	ExtraHeaders     *map[string]string `json:"extra_headers"`
 	BodyOverrideMode *string            `json:"body_override_mode" binding:"omitempty,oneof=off merge replace"`
@@ -45,6 +47,7 @@ type channelMonitorTemplateResponse struct {
 	ID                 int64             `json:"id"`
 	Name               string            `json:"name"`
 	Provider           string            `json:"provider"`
+	APIMode            string            `json:"api_mode"`
 	Description        string            `json:"description"`
 	ExtraHeaders       map[string]string `json:"extra_headers"`
 	BodyOverrideMode   string            `json:"body_override_mode"`
@@ -67,6 +70,7 @@ func (h *ChannelMonitorRequestTemplateHandler) toResponse(c *gin.Context, t *ser
 		ID:                 t.ID,
 		Name:               t.Name,
 		Provider:           t.Provider,
+		APIMode:            t.APIMode,
 		Description:        t.Description,
 		ExtraHeaders:       headers,
 		BodyOverrideMode:   t.BodyOverrideMode,
@@ -93,6 +97,7 @@ func parseTemplateID(c *gin.Context) (int64, bool) {
 func (h *ChannelMonitorRequestTemplateHandler) List(c *gin.Context) {
 	items, err := h.templateService.List(c.Request.Context(), service.ChannelMonitorRequestTemplateListParams{
 		Provider: strings.TrimSpace(c.Query("provider")),
+		APIMode:  strings.TrimSpace(c.Query("api_mode")),
 	})
 	if err != nil {
 		response.ErrorFrom(c, err)
@@ -129,6 +134,7 @@ func (h *ChannelMonitorRequestTemplateHandler) Create(c *gin.Context) {
 	t, err := h.templateService.Create(c.Request.Context(), service.ChannelMonitorRequestTemplateCreateParams{
 		Name:             req.Name,
 		Provider:         req.Provider,
+		APIMode:          req.APIMode,
 		Description:      req.Description,
 		ExtraHeaders:     req.ExtraHeaders,
 		BodyOverrideMode: req.BodyOverrideMode,
@@ -154,6 +160,7 @@ func (h *ChannelMonitorRequestTemplateHandler) Update(c *gin.Context) {
 	}
 	t, err := h.templateService.Update(c.Request.Context(), id, service.ChannelMonitorRequestTemplateUpdateParams{
 		Name:             req.Name,
+		APIMode:          req.APIMode,
 		Description:      req.Description,
 		ExtraHeaders:     req.ExtraHeaders,
 		BodyOverrideMode: req.BodyOverrideMode,
@@ -209,6 +216,7 @@ type associatedMonitorBriefResponse struct {
 	ID       int64  `json:"id"`
 	Name     string `json:"name"`
 	Provider string `json:"provider"`
+	APIMode  string `json:"api_mode"`
 	Enabled  bool   `json:"enabled"`
 }
 
@@ -227,7 +235,7 @@ func (h *ChannelMonitorRequestTemplateHandler) AssociatedMonitors(c *gin.Context
 	out := make([]associatedMonitorBriefResponse, 0, len(items))
 	for _, m := range items {
 		out = append(out, associatedMonitorBriefResponse{
-			ID: m.ID, Name: m.Name, Provider: m.Provider, Enabled: m.Enabled,
+			ID: m.ID, Name: m.Name, Provider: m.Provider, APIMode: m.APIMode, Enabled: m.Enabled,
 		})
 	}
 	response.Success(c, gin.H{"items": out})
diff --git a/backend/internal/repository/channel_monitor_repo.go b/backend/internal/repository/channel_monitor_repo.go
index 800ee43b..6666a130 100644
--- a/backend/internal/repository/channel_monitor_repo.go
+++ b/backend/internal/repository/channel_monitor_repo.go
@@ -37,6 +37,7 @@ func (r *channelMonitorRepository) Create(ctx context.Context, m *service.Channe
 	builder := client.ChannelMonitor.Create().
 		SetName(m.Name).
 		SetProvider(channelmonitor.Provider(m.Provider)).
+		SetAPIMode(defaultAPIModeRepo(m.APIMode)).
 		SetEndpoint(m.Endpoint).
 		SetAPIKeyEncrypted(m.APIKey). // 调用方传入的已是密文
 		SetPrimaryModel(m.PrimaryModel).
@@ -79,6 +80,7 @@ func (r *channelMonitorRepository) Update(ctx context.Context, m *service.Channe
 	updater := client.ChannelMonitor.UpdateOneID(m.ID).
 		SetName(m.Name).
 		SetProvider(channelmonitor.Provider(m.Provider)).
+		SetAPIMode(defaultAPIModeRepo(m.APIMode)).
 		SetEndpoint(m.Endpoint).
 		SetAPIKeyEncrypted(m.APIKey).
 		SetPrimaryModel(m.PrimaryModel).
@@ -708,6 +710,7 @@ func entToServiceMonitor(row *dbent.ChannelMonitor) *service.ChannelMonitor {
 		ID:               row.ID,
 		Name:             row.Name,
 		Provider:         string(row.Provider),
+		APIMode:          defaultAPIModeRepo(row.APIMode),
 		Endpoint:         row.Endpoint,
 		APIKey:           row.APIKeyEncrypted, // 仍为密文，service 层负责解密
 		PrimaryModel:     row.PrimaryModel,
@@ -747,6 +750,13 @@ func defaultBodyModeRepo(mode string) string {
 	return mode
 }
 
+func defaultAPIModeRepo(apiMode string) string {
+	if apiMode == "" {
+		return "chat_completions"
+	}
+	return apiMode
+}
+
 func emptySliceIfNil(in []string) []string {
 	if in == nil {
 		return []string{}
diff --git a/backend/internal/repository/channel_monitor_template_repo.go b/backend/internal/repository/channel_monitor_template_repo.go
index 845d186b..3a972360 100644
--- a/backend/internal/repository/channel_monitor_template_repo.go
+++ b/backend/internal/repository/channel_monitor_template_repo.go
@@ -30,6 +30,7 @@ func (r *channelMonitorRequestTemplateRepository) Create(ctx context.Context, t
 	builder := client.ChannelMonitorRequestTemplate.Create().
 		SetName(t.Name).
 		SetProvider(channelmonitorrequesttemplate.Provider(t.Provider)).
+		SetAPIMode(defaultAPIModeRepo(t.APIMode)).
 		SetDescription(t.Description).
 		SetExtraHeaders(emptyHeadersIfNilRepo(t.ExtraHeaders)).
 		SetBodyOverrideMode(defaultBodyModeRepo(t.BodyOverrideMode))
@@ -61,6 +62,7 @@ func (r *channelMonitorRequestTemplateRepository) Update(ctx context.Context, t
 	client := clientFromContext(ctx, r.client)
 	updater := client.ChannelMonitorRequestTemplate.UpdateOneID(t.ID).
 		SetName(t.Name).
+		SetAPIMode(defaultAPIModeRepo(t.APIMode)).
 		SetDescription(t.Description).
 		SetExtraHeaders(emptyHeadersIfNilRepo(t.ExtraHeaders)).
 		SetBodyOverrideMode(defaultBodyModeRepo(t.BodyOverrideMode))
@@ -90,8 +92,11 @@ func (r *channelMonitorRequestTemplateRepository) List(ctx context.Context, para
 	if params.Provider != "" {
 		q = q.Where(channelmonitorrequesttemplate.ProviderEQ(channelmonitorrequesttemplate.Provider(params.Provider)))
 	}
+	if params.APIMode != "" {
+		q = q.Where(channelmonitorrequesttemplate.APIModeEQ(defaultAPIModeRepo(params.APIMode)))
+	}
 	rows, err := q.
-		Order(dbent.Asc(channelmonitorrequesttemplate.FieldProvider), dbent.Asc(channelmonitorrequesttemplate.FieldName)).
+		Order(dbent.Asc(channelmonitorrequesttemplate.FieldProvider), dbent.Asc(channelmonitorrequesttemplate.FieldAPIMode), dbent.Asc(channelmonitorrequesttemplate.FieldName)).
 		All(ctx)
 	if err != nil {
 		return nil, fmt.Errorf("list monitor templates: %w", err)
@@ -122,7 +127,10 @@ func (r *channelMonitorRequestTemplateRepository) ApplyToMonitors(ctx context.Co
 		Where(
 			channelmonitor.TemplateIDEQ(id),
 			channelmonitor.IDIn(monitorIDs...),
+			channelmonitor.ProviderEQ(channelmonitor.Provider(tpl.Provider)),
+			channelmonitor.APIModeEQ(defaultAPIModeRepo(tpl.APIMode)),
 		).
+		SetAPIMode(defaultAPIModeRepo(tpl.APIMode)).
 		SetExtraHeaders(emptyHeadersIfNilRepo(tpl.ExtraHeaders)).
 		SetBodyOverrideMode(defaultBodyModeRepo(tpl.BodyOverrideMode))
 	if tpl.BodyOverride != nil {
@@ -165,6 +173,7 @@ func (r *channelMonitorRequestTemplateRepository) ListAssociatedMonitors(ctx con
 			ID:       row.ID,
 			Name:     row.Name,
 			Provider: string(row.Provider),
+			APIMode:  defaultAPIModeRepo(row.APIMode),
 			Enabled:  row.Enabled,
 		})
 	}
@@ -185,6 +194,7 @@ func entToServiceTemplate(row *dbent.ChannelMonitorRequestTemplate) *service.Cha
 		ID:               row.ID,
 		Name:             row.Name,
 		Provider:         string(row.Provider),
+		APIMode:          defaultAPIModeRepo(row.APIMode),
 		Description:      row.Description,
 		ExtraHeaders:     headers,
 		BodyOverrideMode: row.BodyOverrideMode,
diff --git a/backend/internal/service/channel_monitor_checker.go b/backend/internal/service/channel_monitor_checker.go
index 33570629..25737e45 100644
--- a/backend/internal/service/channel_monitor_checker.go
+++ b/backend/internal/service/channel_monitor_checker.go
@@ -40,6 +40,8 @@ func newSSRFSafeHTTPClient(timeout time.Duration) *http.Client {
 // CheckOptions 承载一次检测的自定义入参。
 // 所有字段都是可选（零值即等价于"用默认行为"）。
 type CheckOptions struct {
+	// APIMode 仅对 OpenAI provider 生效；空串等同 chat_completions。
+	APIMode string
 	// ExtraHeaders 用户自定义 HTTP 头（merge 到 adapter 默认 headers，用户优先）。
 	ExtraHeaders map[string]string
 	// BodyOverrideMode: off | merge | replace
@@ -164,21 +166,7 @@ type providerAdapter struct {
 //
 //nolint:gochecknoglobals // 适配器表是只读静态数据，初始化后不变更。
 var providerAdapters = map[string]providerAdapter{
-	MonitorProviderOpenAI: {
-		buildPath: func(string) string { return providerOpenAIPath },
-		buildBody: func(model, prompt string) ([]byte, error) {
-			return json.Marshal(map[string]any{
-				"model":      model,
-				"messages":   []map[string]string{{"role": "user", "content": prompt}},
-				"max_tokens": monitorChallengeMaxTokens,
-				"stream":     false,
-			})
-		},
-		buildHeaders: func(apiKey string) map[string]string {
-			return map[string]string{"Authorization": "Bearer " + apiKey}
-		},
-		textPath: "choices.0.message.content",
-	},
+	MonitorProviderOpenAI: providerOpenAIChatAdapter,
 	MonitorProviderAnthropic: {
 		buildPath: func(string) string { return providerAnthropicPath },
 		buildBody: func(model, prompt string) ([]byte, error) {
@@ -215,6 +203,50 @@ var providerAdapters = map[string]providerAdapter{
 	},
 }
 
+//nolint:gochecknoglobals // 适配器表是只读静态数据，初始化后不变更。
+var providerOpenAIChatAdapter = providerAdapter{
+	buildPath: func(string) string { return providerOpenAIPath },
+	buildBody: func(model, prompt string) ([]byte, error) {
+		return json.Marshal(map[string]any{
+			"model":      model,
+			"messages":   []map[string]string{{"role": "user", "content": prompt}},
+			"max_tokens": monitorChallengeMaxTokens,
+			"stream":     false,
+		})
+	},
+	buildHeaders: func(apiKey string) map[string]string {
+		return map[string]string{"Authorization": "Bearer " + apiKey}
+	},
+	textPath: "choices.0.message.content",
+}
+
+//nolint:gochecknoglobals // 适配器表是只读静态数据，初始化后不变更。
+var providerOpenAIResponsesAdapter = providerAdapter{
+	buildPath: func(string) string { return providerOpenAIResponsesPath },
+	buildBody: func(model, prompt string) ([]byte, error) {
+		return json.Marshal(map[string]any{
+			"model":             model,
+			"instructions":      "You are a channel health-check endpoint. Answer the arithmetic challenge exactly and briefly.",
+			"input":             prompt,
+			"max_output_tokens": monitorChallengeMaxTokens,
+			"stream":            false,
+		})
+	},
+	buildHeaders: func(apiKey string) map[string]string {
+		return map[string]string{"Authorization": "Bearer " + apiKey}
+	},
+	textPath: "output.0.content.0.text",
+}
+
+// providerAdapterFor 按 provider + api_mode 选择具体 adapter。
+func providerAdapterFor(provider, apiMode string) (providerAdapter, string, bool) {
+	if provider == MonitorProviderOpenAI && defaultAPIMode(apiMode) == MonitorAPIModeResponses {
+		return providerOpenAIResponsesAdapter, MonitorAPIModeResponses, true
+	}
+	adapter, ok := providerAdapters[provider]
+	return adapter, MonitorAPIModeChatCompletions, ok
+}
+
 // isSupportedProvider 校验 provider 字符串是否在 adapter 表中。
 // 供 validate.go 的 validateProvider 复用，避免两份 switch 漂移。
 func isSupportedProvider(p string) bool {
@@ -231,11 +263,15 @@ func isSupportedProvider(p string) bool {
 //   - status: HTTP 状态码
 //   - err: 网络 / 序列化错误
 func callProvider(ctx context.Context, provider, endpoint, apiKey, model, prompt string, opts *CheckOptions) (extractedText, rawBody string, status int, err error) {
-	adapter, ok := providerAdapters[provider]
+	requestedAPIMode := checkAPIMode(opts)
+	if err := validateAPIMode(provider, requestedAPIMode); err != nil {
+		return "", "", 0, err
+	}
+	adapter, apiMode, ok := providerAdapterFor(provider, requestedAPIMode)
 	if !ok {
 		return "", "", 0, fmt.Errorf("unsupported provider %q", provider)
 	}
-	body, err := buildRequestBody(adapter, provider, model, prompt, opts)
+	body, err := buildRequestBody(adapter, provider, apiMode, model, prompt, opts)
 	if err != nil {
 		return "", "", 0, err
 	}
@@ -275,13 +311,16 @@ func mergeHeaders(base map[string]string, opts *CheckOptions) map[string]string
 //   - replace: 直接 marshal BodyOverride 作为完整 body
 //
 // 任何 mode 返回的 []byte 都已经是合法 JSON，可直接送入 postRawJSON。
-func buildRequestBody(adapter providerAdapter, provider, model, prompt string, opts *CheckOptions) ([]byte, error) {
+func buildRequestBody(adapter providerAdapter, provider, apiMode, model, prompt string, opts *CheckOptions) ([]byte, error) {
 	mode := bodyOverrideMode(opts)
 
 	if mode == MonitorBodyOverrideModeReplace {
 		if opts == nil || len(opts.BodyOverride) == 0 {
 			return nil, fmt.Errorf("replace mode: body_override is empty")
 		}
+		if err := validateReplaceRequestBody(provider, apiMode, opts.BodyOverride); err != nil {
+			return nil, err
+		}
 		body, err := json.Marshal(opts.BodyOverride)
 		if err != nil {
 			return nil, fmt.Errorf("marshal body_override (replace): %w", err)
@@ -301,7 +340,7 @@ func buildRequestBody(adapter providerAdapter, provider, model, prompt string, o
 	if err := json.Unmarshal(defaultBody, &defaultMap); err != nil {
 		return nil, fmt.Errorf("unmarshal default body for merge: %w", err)
 	}
-	deny := bodyMergeKeyDenyList[provider]
+	deny := bodyMergeKeyDenyList[bodyMergeDenyKey(provider, apiMode)]
 	for k, v := range opts.BodyOverride {
 		if deny[k] {
 			continue
@@ -321,9 +360,63 @@ func buildRequestBody(adapter providerAdapter, provider, model, prompt string, o
 //
 //nolint:gochecknoglobals // 静态查表，初始化后不变。
 var bodyMergeKeyDenyList = map[string]map[string]bool{
-	MonitorProviderOpenAI:    {"model": true, "messages": true, "stream": true},
-	MonitorProviderAnthropic: {"model": true, "messages": true},
-	MonitorProviderGemini:    {"contents": true},
+	MonitorProviderOpenAI + ":" + MonitorAPIModeChatCompletions: {"model": true, "messages": true, "stream": true},
+	MonitorProviderOpenAI + ":" + MonitorAPIModeResponses:       {"model": true, "instructions": true, "input": true, "stream": true},
+	MonitorProviderAnthropic:                                    {"model": true, "messages": true},
+	MonitorProviderGemini:                                       {"contents": true},
+}
+
+func checkAPIMode(opts *CheckOptions) string {
+	if opts == nil {
+		return MonitorAPIModeChatCompletions
+	}
+	return defaultAPIMode(opts.APIMode)
+}
+
+func bodyMergeDenyKey(provider, apiMode string) string {
+	if provider == MonitorProviderOpenAI {
+		return provider + ":" + defaultAPIMode(apiMode)
+	}
+	return provider
+}
+
+func validateReplaceRequestBody(provider, apiMode string, body map[string]any) error {
+	if provider != MonitorProviderOpenAI {
+		return nil
+	}
+	switch defaultAPIMode(apiMode) {
+	case MonitorAPIModeResponses:
+		if strings.TrimSpace(stringFromAny(body["instructions"])) == "" || !hasNonEmptyBodyValue(body["input"]) {
+			return fmt.Errorf("replace mode responses body: instructions and input are required")
+		}
+	case MonitorAPIModeChatCompletions:
+		if !hasNonEmptyBodyValue(body["messages"]) {
+			return fmt.Errorf("replace mode chat_completions body: messages are required")
+		}
+	}
+	return nil
+}
+
+func stringFromAny(v any) string {
+	s, _ := v.(string)
+	return s
+}
+
+func hasNonEmptyBodyValue(v any) bool {
+	switch val := v.(type) {
+	case nil:
+		return false
+	case string:
+		return strings.TrimSpace(val) != ""
+	case []any:
+		return len(val) > 0
+	case []map[string]any:
+		return len(val) > 0
+	case []map[string]string:
+		return len(val) > 0
+	default:
+		return true
+	}
 }
 
 // postRawJSON 发送 POST + 已序列化好的 JSON 字节，限制响应体大小，返回响应字节、HTTP status、错误。
diff --git a/backend/internal/service/channel_monitor_checker_body_test.go b/backend/internal/service/channel_monitor_checker_body_test.go
index 323cf8b7..620cf565 100644
--- a/backend/internal/service/channel_monitor_checker_body_test.go
+++ b/backend/internal/service/channel_monitor_checker_body_test.go
@@ -7,6 +7,8 @@ import (
 	"encoding/json"
 	"net/http"
 	"net/http/httptest"
+	"regexp"
+	"strconv"
 	"strings"
 	"testing"
 	"time"
@@ -57,6 +59,76 @@ func setupFakeAnthropic(t *testing.T, handler *captureHandler) string {
 	return srv.URL
 }
 
+type openAICaptureHandler struct {
+	lastBody    map[string]any
+	lastHeaders http.Header
+	lastPath    string
+	status      int
+}
+
+func (h *openAICaptureHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	h.lastHeaders = r.Header.Clone()
+	h.lastPath = r.URL.Path
+	defer func() { _ = r.Body.Close() }()
+	var parsed map[string]any
+	_ = json.NewDecoder(r.Body).Decode(&parsed)
+	h.lastBody = parsed
+
+	if h.status == 0 {
+		h.status = http.StatusOK
+	}
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(h.status)
+
+	answer := answerFromOpenAIRequest(parsed)
+	if h.lastPath == providerOpenAIResponsesPath {
+		_ = json.NewEncoder(w).Encode(map[string]any{
+			"output": []map[string]any{{
+				"content": []map[string]any{{"type": "output_text", "text": answer}},
+			}},
+		})
+		return
+	}
+	_ = json.NewEncoder(w).Encode(map[string]any{
+		"choices": []map[string]any{{"message": map[string]any{"content": answer}}},
+	})
+}
+
+func setupFakeOpenAI(t *testing.T, handler *openAICaptureHandler) string {
+	t.Helper()
+	swapMonitorHTTPClient(t)
+	srv := httptest.NewServer(handler)
+	t.Cleanup(srv.Close)
+	return srv.URL
+}
+
+func answerFromOpenAIRequest(body map[string]any) string {
+	prompt, _ := body["input"].(string)
+	if prompt == "" {
+		if messages, ok := body["messages"].([]any); ok && len(messages) > 0 {
+			if msg, ok := messages[0].(map[string]any); ok {
+				prompt, _ = msg["content"].(string)
+			}
+		}
+	}
+	return answerFromChallengePrompt(prompt)
+}
+
+var challengeQuestionRegex = regexp.MustCompile(`Q: (\d+) ([+-]) (\d+) = \?\nA:$`)
+
+func answerFromChallengePrompt(prompt string) string {
+	m := challengeQuestionRegex.FindStringSubmatch(prompt)
+	if len(m) != 4 {
+		return "0"
+	}
+	left, _ := strconv.Atoi(m[1])
+	right, _ := strconv.Atoi(m[3])
+	if m[2] == "+" {
+		return strconv.Itoa(left + right)
+	}
+	return strconv.Itoa(left - right)
+}
+
 func TestRunCheckForModel_OffMode_PreservesDefaultBody(t *testing.T) {
 	h := &captureHandler{respondText: "the answer is 42"}
 	endpoint := setupFakeAnthropic(t, h)
@@ -75,6 +147,95 @@ func TestRunCheckForModel_OffMode_PreservesDefaultBody(t *testing.T) {
 	}
 }
 
+func TestRunCheckForModel_OpenAI_DefaultChatRequest(t *testing.T) {
+	h := &openAICaptureHandler{}
+	endpoint := setupFakeOpenAI(t, h)
+
+	res := runCheckForModel(context.Background(), MonitorProviderOpenAI, endpoint, "sk-openai", "gpt-test", nil)
+
+	if res.Status != MonitorStatusOperational {
+		t.Fatalf("default chat request should pass challenge, got status=%s message=%q", res.Status, res.Message)
+	}
+	if h.lastPath != providerOpenAIPath {
+		t.Fatalf("expected chat completions path %q, got %q", providerOpenAIPath, h.lastPath)
+	}
+	if h.lastBody["model"] != "gpt-test" {
+		t.Errorf("chat body should contain model=gpt-test, got %v", h.lastBody["model"])
+	}
+	if _, ok := h.lastBody["messages"]; !ok {
+		t.Error("chat body should contain messages")
+	}
+	if _, ok := h.lastBody["instructions"]; ok {
+		t.Error("chat body must not contain top-level instructions")
+	}
+	if h.lastBody["stream"] != false {
+		t.Errorf("chat body should set stream=false, got %v", h.lastBody["stream"])
+	}
+	if h.lastHeaders.Get("Authorization") != "Bearer sk-openai" {
+		t.Errorf("expected bearer auth header, got %q", h.lastHeaders.Get("Authorization"))
+	}
+}
+
+func TestRunCheckForModel_OpenAIResponses_DefaultRequest(t *testing.T) {
+	h := &openAICaptureHandler{}
+	endpoint := setupFakeOpenAI(t, h)
+
+	res := runCheckForModel(context.Background(), MonitorProviderOpenAI, endpoint, "sk-openai", "gpt-test", &CheckOptions{
+		APIMode: MonitorAPIModeResponses,
+	})
+
+	if res.Status != MonitorStatusOperational {
+		t.Fatalf("default responses request should pass challenge, got status=%s message=%q", res.Status, res.Message)
+	}
+	if h.lastPath != providerOpenAIResponsesPath {
+		t.Fatalf("expected responses path %q, got %q", providerOpenAIResponsesPath, h.lastPath)
+	}
+	if h.lastBody["model"] != "gpt-test" {
+		t.Errorf("responses body should contain model=gpt-test, got %v", h.lastBody["model"])
+	}
+	instructions, _ := h.lastBody["instructions"].(string)
+	if strings.TrimSpace(instructions) == "" {
+		t.Error("responses body should contain non-empty instructions")
+	}
+	input, _ := h.lastBody["input"].(string)
+	if strings.TrimSpace(input) == "" {
+		t.Error("responses body should contain non-empty input")
+	}
+	if _, ok := h.lastBody["messages"]; ok {
+		t.Error("responses body must not contain chat messages")
+	}
+	if h.lastBody["stream"] != false {
+		t.Errorf("responses body should set stream=false, got %v", h.lastBody["stream"])
+	}
+	if h.lastHeaders.Get("Authorization") != "Bearer sk-openai" {
+		t.Errorf("expected bearer auth header, got %q", h.lastHeaders.Get("Authorization"))
+	}
+}
+
+func TestRunCheckForModel_OpenAIResponsesReplaceMissingInstructionsFailsLocally(t *testing.T) {
+	h := &openAICaptureHandler{}
+	endpoint := setupFakeOpenAI(t, h)
+
+	res := runCheckForModel(context.Background(), MonitorProviderOpenAI, endpoint, "sk-openai", "gpt-test", &CheckOptions{
+		APIMode:          MonitorAPIModeResponses,
+		BodyOverrideMode: MonitorBodyOverrideModeReplace,
+		BodyOverride: map[string]any{
+			"model": "gpt-test",
+			"input": "hello",
+		},
+	})
+
+	if res.Status != MonitorStatusError {
+		t.Fatalf("invalid responses replace body should fail locally as error, got status=%s", res.Status)
+	}
+	if !strings.Contains(res.Message, "instructions and input are required") {
+		t.Errorf("expected local validation message about instructions/input, got %q", res.Message)
+	}
+	if h.lastPath != "" {
+		t.Errorf("invalid replace body should fail before HTTP request, got path %q", h.lastPath)
+	}
+}
+
 func TestRunCheckForModel_MergeMode_UserFieldsWinButDenyListProtects(t *testing.T) {
 	h := &captureHandler{respondText: "the answer is 42"}
 	endpoint := setupFakeAnthropic(t, h)
diff --git a/backend/internal/service/channel_monitor_const.go b/backend/internal/service/channel_monitor_const.go
index 2e1614f7..d1dffac5 100644
--- a/backend/internal/service/channel_monitor_const.go
+++ b/backend/internal/service/channel_monitor_const.go
@@ -47,6 +47,8 @@ const (
 
 	// providerOpenAIPath OpenAI Chat Completions 路径。
 	providerOpenAIPath = "/v1/chat/completions"
+	// providerOpenAIResponsesPath OpenAI Responses API 路径。
+	providerOpenAIResponsesPath = "/v1/responses"
 	// providerAnthropicPath Anthropic Messages 路径。
 	providerAnthropicPath = "/v1/messages"
 	// providerGeminiPathTemplate Gemini generateContent 路径模板（含 model 占位）。
@@ -112,6 +114,12 @@ var (
 	ErrChannelMonitorInvalidProvider = infraerrors.BadRequest(
 		"CHANNEL_MONITOR_INVALID_PROVIDER", "provider must be one of openai/anthropic/gemini",
 	)
+	ErrChannelMonitorInvalidAPIMode = infraerrors.BadRequest(
+		"CHANNEL_MONITOR_INVALID_API_MODE", "api_mode must be chat_completions or responses; responses is only supported for openai",
+	)
+	ErrChannelMonitorInvalidRequestBody = infraerrors.BadRequest(
+		"CHANNEL_MONITOR_INVALID_REQUEST_BODY", "openai replace-mode body_override must include non-empty messages for chat_completions or non-empty instructions and input for responses",
+	)
 	ErrChannelMonitorInvalidInterval = infraerrors.BadRequest(
 		"CHANNEL_MONITOR_INVALID_INTERVAL", "interval_seconds must be in [15, 3600]",
 	)
diff --git a/backend/internal/service/channel_monitor_service.go b/backend/internal/service/channel_monitor_service.go
index 7050e141..6eec0ae0 100644
--- a/backend/internal/service/channel_monitor_service.go
+++ b/backend/internal/service/channel_monitor_service.go
@@ -107,7 +107,7 @@ func (s *ChannelMonitorService) Create(ctx context.Context, p ChannelMonitorCrea
 	if err := validateCreateParams(p); err != nil {
 		return nil, err
 	}
-	if err := validateBodyModeParams(p.BodyOverrideMode, p.BodyOverride); err != nil {
+	if err := validateBodyModeForProtocol(p.Provider, p.APIMode, p.BodyOverrideMode, p.BodyOverride); err != nil {
 		return nil, err
 	}
 	if err := validateExtraHeaders(p.ExtraHeaders); err != nil {
@@ -120,6 +120,7 @@ func (s *ChannelMonitorService) Create(ctx context.Context, p ChannelMonitorCrea
 	m := &ChannelMonitor{
 		Name:             strings.TrimSpace(p.Name),
 		Provider:         p.Provider,
+		APIMode:          defaultAPIMode(p.APIMode),
 		Endpoint:         normalizeEndpoint(p.Endpoint),
 		APIKey:           encrypted, // 注意：传入 repository 时该字段为密文
 		PrimaryModel:     strings.TrimSpace(p.PrimaryModel),
@@ -150,6 +151,9 @@ func validateCreateParams(p ChannelMonitorCreateParams) error {
 	if err := validateProvider(p.Provider); err != nil {
 		return err
 	}
+	if err := validateAPIMode(p.Provider, p.APIMode); err != nil {
+		return err
+	}
 	if err := validateInterval(p.IntervalSeconds); err != nil {
 		return err
 	}
@@ -298,6 +302,7 @@ func (s *ChannelMonitorService) runChecksConcurrent(ctx context.Context, m *Chan
 
 	// 所有模型共用同一份 CheckOptions（来自监控的快照字段）。
 	opts := &CheckOptions{
+		APIMode:          m.APIMode,
 		ExtraHeaders:     m.ExtraHeaders,
 		BodyOverrideMode: m.BodyOverrideMode,
 		BodyOverride:     m.BodyOverride,
@@ -469,6 +474,7 @@ func (s *ChannelMonitorService) decryptInPlace(m *ChannelMonitor) {
 // 行数稍超过 30：这是逐字段平铺的 dispatcher，每个 if 都是 1-3 行的"非 nil 则覆盖"模式，
 // 拆分反而会增加跳转噪音、影响可读性，故保留为单函数。
 func applyMonitorUpdate(existing *ChannelMonitor, p ChannelMonitorUpdateParams) error {
+	providerChanged := false
 	if p.Name != nil {
 		existing.Name = strings.TrimSpace(*p.Name)
 	}
@@ -477,6 +483,7 @@ func applyMonitorUpdate(existing *ChannelMonitor, p ChannelMonitorUpdateParams)
 			return err
 		}
 		existing.Provider = *p.Provider
+		providerChanged = true
 	}
 	if p.Endpoint != nil {
 		if err := validateEndpoint(*p.Endpoint); err != nil {
@@ -502,11 +509,11 @@ func applyMonitorUpdate(existing *ChannelMonitor, p ChannelMonitorUpdateParams)
 		}
 		existing.IntervalSeconds = *p.IntervalSeconds
 	}
-	return applyMonitorAdvancedUpdate(existing, p)
+	return applyMonitorAdvancedUpdate(existing, p, providerChanged)
 }
 
 // applyMonitorAdvancedUpdate 处理自定义请求快照相关字段，从 applyMonitorUpdate 拆出避免过长。
-func applyMonitorAdvancedUpdate(existing *ChannelMonitor, p ChannelMonitorUpdateParams) error {
+func applyMonitorAdvancedUpdate(existing *ChannelMonitor, p ChannelMonitorUpdateParams, providerChanged bool) error {
 	if p.ClearTemplate {
 		existing.TemplateID = nil
 	} else if p.TemplateID != nil {
@@ -519,6 +526,15 @@ func applyMonitorAdvancedUpdate(existing *ChannelMonitor, p ChannelMonitorUpdate
 		}
 		existing.ExtraHeaders = emptyHeadersIfNil(*p.ExtraHeaders)
 	}
+	newAPIMode := defaultAPIMode(existing.APIMode)
+	if p.APIMode != nil {
+		newAPIMode = defaultAPIMode(*p.APIMode)
+	} else if existing.Provider != MonitorProviderOpenAI {
+		newAPIMode = MonitorAPIModeChatCompletions
+	}
+	if err := validateAPIMode(existing.Provider, newAPIMode); err != nil {
+		return err
+	}
 	// BodyOverrideMode / BodyOverride 联合校验，和模板一致。
 	newMode := existing.BodyOverrideMode
 	newBody := existing.BodyOverride
@@ -528,12 +544,13 @@ func applyMonitorAdvancedUpdate(existing *ChannelMonitor, p ChannelMonitorUpdate
 	if p.BodyOverride != nil {
 		newBody = *p.BodyOverride
 	}
-	if p.BodyOverrideMode != nil || p.BodyOverride != nil {
-		if err := validateBodyModeParams(newMode, newBody); err != nil {
+	if providerChanged || p.APIMode != nil || p.BodyOverrideMode != nil || p.BodyOverride != nil {
+		if err := validateBodyModeForProtocol(existing.Provider, newAPIMode, newMode, newBody); err != nil {
 			return err
 		}
 		existing.BodyOverrideMode = defaultBodyMode(newMode)
 		existing.BodyOverride = newBody
 	}
+	existing.APIMode = newAPIMode
 	return nil
 }
diff --git a/backend/internal/service/channel_monitor_template_service.go b/backend/internal/service/channel_monitor_template_service.go
index 8d2e8173..4d50952d 100644
--- a/backend/internal/service/channel_monitor_template_service.go
+++ b/backend/internal/service/channel_monitor_template_service.go
@@ -14,14 +14,14 @@ type ChannelMonitorRequestTemplateRepository interface {
 	Update(ctx context.Context, t *ChannelMonitorRequestTemplate) error
 	Delete(ctx context.Context, id int64) error
 	List(ctx context.Context, params ChannelMonitorRequestTemplateListParams) ([]*ChannelMonitorRequestTemplate, error)
-	// ApplyToMonitors 把模板当前的 extra_headers / body_override_mode / body_override
+	// ApplyToMonitors 把模板当前的 api_mode / extra_headers / body_override_mode / body_override
 	// 批量覆盖到指定 monitorIDs 的监控上（同时还要求这些监控当前 template_id = id，
 	// 防止误覆盖未关联的监控）。monitorIDs 必须非空；空列表直接返回 0 不写库。
 	// 返回被覆盖的监控数量。
 	ApplyToMonitors(ctx context.Context, id int64, monitorIDs []int64) (int64, error)
 	// CountAssociatedMonitors 统计 template_id = id 的监控数（用于 UI 展示「应用到 N 个配置」）。
 	CountAssociatedMonitors(ctx context.Context, id int64) (int64, error)
-	// ListAssociatedMonitors 列出所有 template_id = id 的监控简略信息（id/name/provider/enabled）
+	// ListAssociatedMonitors 列出所有 template_id = id 的监控简略信息（id/name/provider/api_mode/enabled）
 	// 给 apply picker UI 用，避免前端再做一次 list+filter。
 	ListAssociatedMonitors(ctx context.Context, id int64) ([]*AssociatedMonitorBrief, error)
 }
@@ -31,6 +31,7 @@ type AssociatedMonitorBrief struct {
 	ID       int64
 	Name     string
 	Provider string
+	APIMode  string
 	Enabled  bool
 }
 
@@ -53,6 +54,15 @@ func (s *ChannelMonitorRequestTemplateService) List(ctx context.Context, params
 			return nil, err
 		}
 	}
+	if params.APIMode != "" {
+		if params.Provider == "" {
+			if err := validateAPIMode(MonitorProviderOpenAI, params.APIMode); err != nil {
+				return nil, err
+			}
+		} else if err := validateAPIMode(params.Provider, params.APIMode); err != nil {
+			return nil, err
+		}
+	}
 	return s.repo.List(ctx, params)
 }
 
@@ -69,6 +79,7 @@ func (s *ChannelMonitorRequestTemplateService) Create(ctx context.Context, p Cha
 	t := &ChannelMonitorRequestTemplate{
 		Name:             strings.TrimSpace(p.Name),
 		Provider:         p.Provider,
+		APIMode:          defaultAPIMode(p.APIMode),
 		Description:      strings.TrimSpace(p.Description),
 		ExtraHeaders:     emptyHeadersIfNil(p.ExtraHeaders),
 		BodyOverrideMode: defaultBodyMode(p.BodyOverrideMode),
@@ -144,7 +155,10 @@ func validateTemplateCreateParams(p ChannelMonitorRequestTemplateCreateParams) e
 	if err := validateProvider(p.Provider); err != nil {
 		return ErrChannelMonitorTemplateInvalidProvider
 	}
-	if err := validateBodyModeParams(p.BodyOverrideMode, p.BodyOverride); err != nil {
+	if err := validateAPIMode(p.Provider, p.APIMode); err != nil {
+		return ErrChannelMonitorTemplateInvalidAPIMode
+	}
+	if err := validateBodyModeForProtocol(p.Provider, p.APIMode, p.BodyOverrideMode, p.BodyOverride); err != nil {
 		return err
 	}
 	if err := validateExtraHeaders(p.ExtraHeaders); err != nil {
@@ -165,6 +179,13 @@ func applyTemplateUpdate(existing *ChannelMonitorRequestTemplate, p ChannelMonit
 	if p.Description != nil {
 		existing.Description = strings.TrimSpace(*p.Description)
 	}
+	newAPIMode := defaultAPIMode(existing.APIMode)
+	if p.APIMode != nil {
+		newAPIMode = defaultAPIMode(*p.APIMode)
+	}
+	if err := validateAPIMode(existing.Provider, newAPIMode); err != nil {
+		return ErrChannelMonitorTemplateInvalidAPIMode
+	}
 	if p.ExtraHeaders != nil {
 		if err := validateExtraHeaders(*p.ExtraHeaders); err != nil {
 			return err
@@ -180,14 +201,29 @@ func applyTemplateUpdate(existing *ChannelMonitorRequestTemplate, p ChannelMonit
 	if p.BodyOverride != nil {
 		newBody = *p.BodyOverride
 	}
-	if err := validateBodyModeParams(newMode, newBody); err != nil {
+	if err := validateBodyModeForProtocol(existing.Provider, newAPIMode, newMode, newBody); err != nil {
 		return err
 	}
+	existing.APIMode = newAPIMode
 	existing.BodyOverrideMode = defaultBodyMode(newMode)
 	existing.BodyOverride = newBody
 	return nil
 }
 
+// validateBodyModeForProtocol 校验 body_override_mode 与 provider/api_mode 的协议特定要求。
+func validateBodyModeForProtocol(provider, apiMode, mode string, body map[string]any) error {
+	if err := validateBodyModeParams(mode, body); err != nil {
+		return err
+	}
+	if defaultBodyMode(mode) != MonitorBodyOverrideModeReplace {
+		return nil
+	}
+	if err := validateReplaceRequestBody(provider, defaultAPIMode(apiMode), body); err != nil {
+		return ErrChannelMonitorInvalidRequestBody
+	}
+	return nil
+}
+
 // validateBodyModeParams 校验 body_override_mode 合法，且 merge/replace 模式下 body_override 非空。
 func validateBodyModeParams(mode string, body map[string]any) error {
 	switch mode {
diff --git a/backend/internal/service/channel_monitor_template_types.go b/backend/internal/service/channel_monitor_template_types.go
index e5bf7568..03cd518d 100644
--- a/backend/internal/service/channel_monitor_template_types.go
+++ b/backend/internal/service/channel_monitor_template_types.go
@@ -12,6 +12,7 @@ type ChannelMonitorRequestTemplate struct {
 	ID               int64
 	Name             string
 	Provider         string
+	APIMode          string
 	Description      string
 	ExtraHeaders     map[string]string
 	BodyOverrideMode string
@@ -23,12 +24,14 @@ type ChannelMonitorRequestTemplate struct {
 // ChannelMonitorRequestTemplateListParams 列表过滤。
 type ChannelMonitorRequestTemplateListParams struct {
 	Provider string // 空 = 全部；非空则按 provider 过滤
+	APIMode  string // 空 = 全部；非空则按 api_mode 过滤
 }
 
 // ChannelMonitorRequestTemplateCreateParams 创建参数。
 type ChannelMonitorRequestTemplateCreateParams struct {
 	Name             string
 	Provider         string
+	APIMode          string
 	Description      string
 	ExtraHeaders     map[string]string
 	BodyOverrideMode string
@@ -39,6 +42,7 @@ type ChannelMonitorRequestTemplateCreateParams struct {
 // 注意 Provider 不可修改：改 provider 会让已关联监控的 body 黑名单语义错乱。
 type ChannelMonitorRequestTemplateUpdateParams struct {
 	Name             *string
+	APIMode          *string
 	Description      *string
 	ExtraHeaders     *map[string]string
 	BodyOverrideMode *string
@@ -53,6 +57,9 @@ var (
 	ErrChannelMonitorTemplateInvalidProvider = infraerrors.BadRequest(
 		"CHANNEL_MONITOR_TEMPLATE_INVALID_PROVIDER", "template provider must be one of openai/anthropic/gemini",
 	)
+	ErrChannelMonitorTemplateInvalidAPIMode = infraerrors.BadRequest(
+		"CHANNEL_MONITOR_TEMPLATE_INVALID_API_MODE", "template api_mode must be chat_completions or responses; responses is only supported for openai",
+	)
 	ErrChannelMonitorTemplateMissingName = infraerrors.BadRequest(
 		"CHANNEL_MONITOR_TEMPLATE_MISSING_NAME", "template name is required",
 	)
@@ -71,6 +78,9 @@ var (
 	ErrChannelMonitorTemplateProviderMismatch = infraerrors.BadRequest(
 		"CHANNEL_MONITOR_TEMPLATE_PROVIDER_MISMATCH", "monitor provider does not match template provider",
 	)
+	ErrChannelMonitorTemplateAPIModeMismatch = infraerrors.BadRequest(
+		"CHANNEL_MONITOR_TEMPLATE_API_MODE_MISMATCH", "monitor api_mode does not match template api_mode",
+	)
 	ErrChannelMonitorTemplateApplyEmpty = infraerrors.BadRequest(
 		"CHANNEL_MONITOR_TEMPLATE_APPLY_EMPTY", "monitor_ids must be a non-empty array",
 	)
diff --git a/backend/internal/service/channel_monitor_types.go b/backend/internal/service/channel_monitor_types.go
index b797a89b..ef86eeb8 100644
--- a/backend/internal/service/channel_monitor_types.go
+++ b/backend/internal/service/channel_monitor_types.go
@@ -15,11 +15,23 @@ const (
 	MonitorBodyOverrideModeReplace = "replace"
 )
 
+// MonitorAPIMode 描述 OpenAI provider 的请求协议。
+//
+//   - chat_completions  OpenAI-compatible Chat Completions: /v1/chat/completions + messages
+//   - responses         OpenAI Responses API: /v1/responses + instructions/input
+//
+// 非 OpenAI provider 固定使用 chat_completions 作为占位默认值，避免为每个 provider 单独扩表。
+const (
+	MonitorAPIModeChatCompletions = "chat_completions"
+	MonitorAPIModeResponses       = "responses"
+)
+
 // ChannelMonitor 渠道监控配置（service 层模型，不直接暴露 ent 类型）。
 type ChannelMonitor struct {
 	ID              int64
 	Name            string
 	Provider        string
+	APIMode         string
 	Endpoint        string
 	APIKey          string // 解密后的明文 API Key（仅在 service 内部使用，handler 层不应直接序列化返回）
 	PrimaryModel    string
@@ -56,6 +68,7 @@ type ChannelMonitorListParams struct {
 type ChannelMonitorCreateParams struct {
 	Name             string
 	Provider         string
+	APIMode          string
 	Endpoint         string
 	APIKey           string
 	PrimaryModel     string
@@ -74,6 +87,7 @@ type ChannelMonitorCreateParams struct {
 type ChannelMonitorUpdateParams struct {
 	Name            *string
 	Provider        *string
+	APIMode         *string
 	Endpoint        *string
 	APIKey          *string // 空字符串表示不修改；非空字符串覆盖
 	PrimaryModel    *string
diff --git a/backend/internal/service/channel_monitor_validate.go b/backend/internal/service/channel_monitor_validate.go
index 16bbec71..6ff22b9f 100644
--- a/backend/internal/service/channel_monitor_validate.go
+++ b/backend/internal/service/channel_monitor_validate.go
@@ -18,6 +18,23 @@ func validateProvider(p string) error {
 	return nil
 }
 
+// validateAPIMode 校验 provider 与 api_mode 的组合。
+// responses 只对 OpenAI 有意义；其它 provider 使用 chat_completions 作为默认占位。
+func validateAPIMode(provider, apiMode string) error {
+	apiMode = defaultAPIMode(apiMode)
+	switch apiMode {
+	case MonitorAPIModeChatCompletions:
+		return nil
+	case MonitorAPIModeResponses:
+		if provider == "" || provider == MonitorProviderOpenAI {
+			return nil
+		}
+		return ErrChannelMonitorInvalidAPIMode
+	default:
+		return ErrChannelMonitorInvalidAPIMode
+	}
+}
+
 // validateInterval 校验 interval_seconds 范围。
 func validateInterval(sec int) error {
 	if sec < monitorMinIntervalSeconds || sec > monitorMaxIntervalSeconds {
@@ -97,3 +114,11 @@ func normalizeModels(in []string) []string {
 	}
 	return out
 }
+
+// defaultAPIMode 空串归一为 chat_completions，保证历史数据与旧客户端兼容。
+func defaultAPIMode(apiMode string) string {
+	if strings.TrimSpace(apiMode) == "" {
+		return MonitorAPIModeChatCompletions
+	}
+	return strings.TrimSpace(apiMode)
+}
diff --git a/backend/migrations/138_channel_monitor_openai_api_mode.sql b/backend/migrations/138_channel_monitor_openai_api_mode.sql
new file mode 100644
index 00000000..5b16f39c
--- /dev/null
+++ b/backend/migrations/138_channel_monitor_openai_api_mode.sql
@@ -0,0 +1,40 @@
+-- Migration: 137_channel_monitor_openai_api_mode
+-- 为渠道监控和请求模板增加 OpenAI 协议模式：
+--   chat_completions -> /v1/chat/completions + messages
+--   responses        -> /v1/responses + instructions/input
+-- 历史数据默认保持 chat_completions，避免改变现有监控行为。
+
+ALTER TABLE channel_monitors
+    ADD COLUMN IF NOT EXISTS api_mode VARCHAR(32) NOT NULL DEFAULT 'chat_completions';
+
+ALTER TABLE channel_monitor_request_templates
+    ADD COLUMN IF NOT EXISTS api_mode VARCHAR(32) NOT NULL DEFAULT 'chat_completions';
+
+DO $$
+BEGIN
+    IF NOT EXISTS (
+        SELECT 1 FROM information_schema.table_constraints
+        WHERE constraint_name = 'channel_monitors_api_mode_check'
+          AND table_name = 'channel_monitors'
+    ) THEN
+        ALTER TABLE channel_monitors
+            ADD CONSTRAINT channel_monitors_api_mode_check
+            CHECK (api_mode IN ('chat_completions', 'responses'));
+    END IF;
+
+    IF NOT EXISTS (
+        SELECT 1 FROM information_schema.table_constraints
+        WHERE constraint_name = 'channel_monitor_request_templates_api_mode_check'
+          AND table_name = 'channel_monitor_request_templates'
+    ) THEN
+        ALTER TABLE channel_monitor_request_templates
+            ADD CONSTRAINT channel_monitor_request_templates_api_mode_check
+            CHECK (api_mode IN ('chat_completions', 'responses'));
+    END IF;
+END $$;
+
+CREATE INDEX IF NOT EXISTS idx_channel_monitors_provider_api_mode
+    ON channel_monitors (provider, api_mode);
+
+CREATE INDEX IF NOT EXISTS idx_channel_monitor_templates_provider_api_mode
+    ON channel_monitor_request_templates (provider, api_mode);
diff --git a/backend/migrations/139_seed_openai_monitor_templates.sql b/backend/migrations/139_seed_openai_monitor_templates.sql
new file mode 100644
index 00000000..6326cd0a
--- /dev/null
+++ b/backend/migrations/139_seed_openai_monitor_templates.sql
@@ -0,0 +1,47 @@
+-- Migration: 138_seed_openai_monitor_templates
+-- 内置 OpenAI 渠道监控模板。重点是把协议模式显式化：
+--   1) OpenAI-compatible 使用 Chat Completions payload
+--   2) Responses / 本站自检 使用 Responses payload，默认 body 由后端 adapter 填入 instructions + input
+-- 所有模板都可直接选择；ON CONFLICT 保证重复部署不覆盖用户编辑。
+
+INSERT INTO channel_monitor_request_templates (
+    name, provider, api_mode, description, extra_headers, body_override_mode, body_override
+)
+VALUES
+(
+    'OpenAI Compatible 默认检测',
+    'openai',
+    'chat_completions',
+    '适用于大多数 OpenAI-compatible 上游：POST /v1/chat/completions，后端自动生成 messages 数学 challenge。',
+    '{}'::jsonb,
+    'off',
+    NULL
+),
+(
+    'OpenAI Compatible 低 token 检测',
+    'openai',
+    'chat_completions',
+    '仍走 /v1/chat/completions，仅把 max_tokens 调低；model/messages/stream 由后端保护，避免误伤 challenge。',
+    '{}'::jsonb,
+    'merge',
+    '{"max_tokens": 20}'::jsonb
+),
+(
+    'OpenAI Responses / 本站自检',
+    'openai',
+    'responses',
+    '适用于本站或原生 Responses API：POST /v1/responses，默认 payload 自动带 instructions 与 input，避免 Instructions are required。',
+    '{}'::jsonb,
+    'off',
+    NULL
+),
+(
+    'OpenAI Responses 低 token 检测',
+    'openai',
+    'responses',
+    '仍走 /v1/responses，仅把 max_output_tokens 调低；instructions/input/model/stream 由后端保护。',
+    '{}'::jsonb,
+    'merge',
+    '{"max_output_tokens": 20}'::jsonb
+)
+ON CONFLICT (provider, name) DO NOTHING;
diff --git a/frontend/src/api/admin/channelMonitor.ts b/frontend/src/api/admin/channelMonitor.ts
index 949c4bc8..bdef7d33 100644
--- a/frontend/src/api/admin/channelMonitor.ts
+++ b/frontend/src/api/admin/channelMonitor.ts
@@ -8,11 +8,13 @@ import { apiClient } from '../client'
 export type Provider = 'openai' | 'anthropic' | 'gemini'
 export type MonitorStatus = 'operational' | 'degraded' | 'failed' | 'error'
 export type BodyOverrideMode = 'off' | 'merge' | 'replace'
+export type APIMode = 'chat_completions' | 'responses'
 
 export interface ChannelMonitor {
   id: number
   name: string
   provider: Provider
+  api_mode: APIMode
   endpoint: string
   api_key_masked: string
   /**
@@ -70,6 +72,7 @@ export interface ListResponse {
 export interface CreateParams {
   name: string
   provider: Provider
+  api_mode?: APIMode
   endpoint: string
   api_key: string
   primary_model: string
diff --git a/frontend/src/api/admin/channelMonitorTemplate.ts b/frontend/src/api/admin/channelMonitorTemplate.ts
index 01b3c2d0..7b048104 100644
--- a/frontend/src/api/admin/channelMonitorTemplate.ts
+++ b/frontend/src/api/admin/channelMonitorTemplate.ts
@@ -6,12 +6,13 @@
  */
 
 import { apiClient } from '../client'
-import type { BodyOverrideMode, Provider } from './channelMonitor'
+import type { APIMode, BodyOverrideMode, Provider } from './channelMonitor'
 
 export interface ChannelMonitorTemplate {
   id: number
   name: string
   provider: Provider
+  api_mode: APIMode
   description: string
   extra_headers: Record<string, string>
   body_override_mode: BodyOverrideMode
@@ -24,6 +25,7 @@ export interface ChannelMonitorTemplate {
 
 export interface ListParams {
   provider?: Provider
+  api_mode?: APIMode
 }
 
 export interface ListResponse {
@@ -33,6 +35,7 @@ export interface ListResponse {
 export interface CreateParams {
   name: string
   provider: Provider
+  api_mode?: APIMode
   description?: string
   extra_headers?: Record<string, string>
   body_override_mode?: BodyOverrideMode
@@ -41,6 +44,7 @@ export interface CreateParams {
 
 export interface UpdateParams {
   name?: string
+  api_mode?: APIMode
   description?: string
   extra_headers?: Record<string, string>
   body_override_mode?: BodyOverrideMode
@@ -55,6 +59,7 @@ export interface AssociatedMonitorBrief {
   id: number
   name: string
   provider: Provider
+  api_mode: APIMode
   enabled: boolean
 }
 
diff --git a/frontend/src/components/admin/monitor/MonitorAdvancedRequestConfig.vue b/frontend/src/components/admin/monitor/MonitorAdvancedRequestConfig.vue
index 0d6b4ace..404b6916 100644
--- a/frontend/src/components/admin/monitor/MonitorAdvancedRequestConfig.vue
+++ b/frontend/src/components/admin/monitor/MonitorAdvancedRequestConfig.vue
@@ -106,9 +106,15 @@
 <script setup lang="ts">
 import { computed, ref, watch } from 'vue'
 import { useI18n } from 'vue-i18n'
-import type { BodyOverrideMode } from '@/api/admin/channelMonitor'
+import type { APIMode, BodyOverrideMode, Provider } from '@/api/admin/channelMonitor'
+import {
+  API_MODE_RESPONSES,
+  PROVIDER_OPENAI,
+} from '@/constants/channelMonitor'
 
 const props = defineProps<{
+  provider?: Provider
+  apiMode?: APIMode
   extraHeaders: Record<string, string>
   bodyOverrideMode: BodyOverrideMode
   bodyOverride: Record<string, unknown> | null
@@ -293,6 +299,18 @@ const bodyModeHint = computed(() => {
 })
 
 const bodyPlaceholder = computed(() => {
+  if (props.provider === PROVIDER_OPENAI && props.apiMode === API_MODE_RESPONSES) {
+    if (props.bodyOverrideMode === 'merge') {
+      return '{\n  "max_output_tokens": 20\n}'
+    }
+    return '{\n  "model": "gpt-4o-mini",\n  "instructions": "You are a health check endpoint. Reply briefly.",\n  "input": "Reply with exactly: ok",\n  "max_output_tokens": 20,\n  "stream": false\n}'
+  }
+  if (props.provider === PROVIDER_OPENAI) {
+    if (props.bodyOverrideMode === 'merge') {
+      return '{\n  "max_tokens": 20\n}'
+    }
+    return '{\n  "model": "gpt-4o-mini",\n  "messages": [{"role":"user","content":"Reply with exactly: ok"}],\n  "max_tokens": 20,\n  "stream": false\n}'
+  }
   if (props.bodyOverrideMode === 'merge') {
     return '{\n  "system": "You are Claude Code..."\n}'
   }
diff --git a/frontend/src/components/admin/monitor/MonitorFormDialog.vue b/frontend/src/components/admin/monitor/MonitorFormDialog.vue
index 21fa4715..cc916c65 100644
--- a/frontend/src/components/admin/monitor/MonitorFormDialog.vue
+++ b/frontend/src/components/admin/monitor/MonitorFormDialog.vue
@@ -29,6 +29,24 @@
         </div>
       </div>
 
+      <div v-if="form.provider === PROVIDER_OPENAI" class="rounded-lg border border-blue-100 bg-blue-50/50 p-3 dark:border-blue-500/20 dark:bg-blue-500/10">
+        <label class="input-label">{{ t('admin.channelMonitor.form.apiMode') }}</label>
+        <div class="grid gap-3 sm:grid-cols-2">
+          <button
+            v-for="opt in apiModeOptions"
+            :key="opt.value"
+            type="button"
+            :aria-pressed="form.api_mode === opt.value"
+            class="rounded-lg border-2 px-3 py-2 text-left transition-colors"
+            :class="apiModeButtonClass(opt.value)"
+            @click="form.api_mode = opt.value"
+          >
+            <span class="block text-sm font-semibold">{{ opt.label }}</span>
+            <span class="mt-0.5 block text-xs opacity-80">{{ opt.hint }}</span>
+          </button>
+        </div>
+      </div>
+
       <div>
         <label class="input-label">{{ t('admin.channelMonitor.form.endpoint') }} <span class="text-red-500">*</span></label>
         <div class="flex gap-2">
@@ -115,6 +133,8 @@
           </div>
 
           <MonitorAdvancedRequestConfig
+            :provider="form.provider"
+            :api-mode="form.api_mode"
             :extra-headers="form.extra_headers"
             :body-override-mode="form.body_override_mode"
             :body-override="form.body_override"
@@ -168,6 +188,7 @@ import type {
   BodyOverrideMode,
   ChannelMonitor,
   CreateParams,
+  APIMode,
   Provider,
   UpdateParams,
 } from '@/api/admin/channelMonitor'
@@ -186,6 +207,8 @@ import {
   PROVIDER_OPENAI,
   PROVIDER_ANTHROPIC,
   PROVIDER_GEMINI,
+  API_MODE_CHAT_COMPLETIONS,
+  API_MODE_RESPONSES,
   DEFAULT_INTERVAL_SECONDS,
 } from '@/constants/channelMonitor'
 
@@ -224,6 +247,7 @@ const userGroupRates = ref<Record<number, number>>({})
 interface MonitorForm {
   name: string
   provider: Provider
+  api_mode: APIMode
   endpoint: string
   api_key: string
   primary_model: string
@@ -241,6 +265,7 @@ interface MonitorForm {
 const form = reactive<MonitorForm>({
   name: '',
   provider: PROVIDER_ANTHROPIC,
+  api_mode: API_MODE_CHAT_COMPLETIONS,
   endpoint: '',
   api_key: '',
   primary_model: '',
@@ -254,15 +279,21 @@ const form = reactive<MonitorForm>({
   body_override: null,
 })
 
-// 可用模板列表（进入 dialog 时一次性拉取 cache；按 provider 过滤）。
+let suppressFormWatchers = false
+
+// 可用模板列表（进入 dialog 时一次性拉取 cache；按 provider / api mode 过滤）。
 const templatesCache = ref<ChannelMonitorTemplate[]>([])
 const templatesLoading = ref(false)
 
 const templateOptions = computed(() => {
-  const items = templatesCache.value.filter((t) => t.provider === form.provider)
+  const items = templatesCache.value.filter((t) => {
+    if (t.provider !== form.provider) return false
+    if (form.provider !== PROVIDER_OPENAI) return true
+    return normalizeAPIMode(t.api_mode) === form.api_mode
+  })
   return [
     { value: '', label: t('admin.channelMonitor.templateField.none') },
-    ...items.map((t) => ({ value: String(t.id), label: t.name })),
+    ...items.map((t) => ({ value: String(t.id), label: templateOptionLabel(t) })),
   ]
 })
 
@@ -294,13 +325,57 @@ const templateSelectValue = computed<string>({
     // 应用模板 = 拷贝快照
     const tpl = templatesCache.value.find((t) => t.id === id)
     if (tpl) {
+      suppressFormWatchers = true
+      form.api_mode = normalizeAPIMode(tpl.api_mode)
+      form.template_id = id
       form.extra_headers = { ...(tpl.extra_headers || {}) }
       form.body_override_mode = tpl.body_override_mode
       form.body_override = tpl.body_override ? { ...tpl.body_override } : null
+      suppressFormWatchers = false
     }
   },
 })
 
+const apiModeOptions = computed<{ value: APIMode; label: string; hint: string }[]>(() => [
+  {
+    value: API_MODE_CHAT_COMPLETIONS,
+    label: t('admin.channelMonitor.form.apiModeChatCompletions'),
+    hint: t('admin.channelMonitor.form.apiModeChatCompletionsHint'),
+  },
+  {
+    value: API_MODE_RESPONSES,
+    label: t('admin.channelMonitor.form.apiModeResponses'),
+    hint: t('admin.channelMonitor.form.apiModeResponsesHint'),
+  },
+])
+
+function normalizeAPIMode(mode: APIMode | undefined | null): APIMode {
+  return mode === API_MODE_RESPONSES ? API_MODE_RESPONSES : API_MODE_CHAT_COMPLETIONS
+}
+
+function apiModeButtonClass(mode: APIMode): string {
+  const active = form.api_mode === mode
+  if (active) {
+    return 'border-primary-500 bg-white text-primary-700 shadow-sm dark:border-primary-400 dark:bg-primary-500/15 dark:text-primary-300'
+  }
+  return 'border-blue-100 bg-white/70 text-gray-600 hover:border-primary-300 dark:border-dark-700 dark:bg-dark-800 dark:text-gray-400'
+}
+
+function templateOptionLabel(tpl: ChannelMonitorTemplate): string {
+  if (tpl.provider !== PROVIDER_OPENAI) return tpl.name
+  const labelKey = normalizeAPIMode(tpl.api_mode) === API_MODE_RESPONSES
+    ? 'admin.channelMonitor.form.apiModeResponses'
+    : 'admin.channelMonitor.form.apiModeChatCompletions'
+  return `${tpl.name} · ${t(labelKey)}`
+}
+
+function clearRequestSnapshot() {
+  form.template_id = null
+  form.extra_headers = {}
+  form.body_override_mode = 'off'
+  form.body_override = null
+}
+
 interface ProviderOption {
   value: Provider
   label: string
@@ -318,13 +393,26 @@ const providerOptions = computed<ProviderOption[]>(() => [
 // picks a new key.
 // 同时清空 template_id（模板有 provider 归属，跨平台不通用）。
 watch(() => form.provider, () => {
+  if (suppressFormWatchers) return
   form.api_key = ''
-  form.template_id = null
-})
+  if (form.provider !== PROVIDER_OPENAI) {
+    form.api_mode = API_MODE_CHAT_COMPLETIONS
+  }
+  clearRequestSnapshot()
+}, { flush: 'sync' })
+
+watch(() => form.api_mode, () => {
+  if (suppressFormWatchers) return
+  if (form.provider === PROVIDER_OPENAI) {
+    clearRequestSnapshot()
+  }
+}, { flush: 'sync' })
 
 function resetForm() {
+  suppressFormWatchers = true
   form.name = ''
   form.provider = PROVIDER_ANTHROPIC
+  form.api_mode = API_MODE_CHAT_COMPLETIONS
   form.endpoint = ''
   form.api_key = ''
   form.primary_model = ''
@@ -336,11 +424,14 @@ function resetForm() {
   form.extra_headers = {}
   form.body_override_mode = 'off'
   form.body_override = null
+  suppressFormWatchers = false
 }
 
 function loadFromMonitor(m: ChannelMonitor) {
+  suppressFormWatchers = true
   form.name = m.name
   form.provider = m.provider
+  form.api_mode = normalizeAPIMode(m.api_mode)
   form.endpoint = m.endpoint
   form.api_key = ''
   form.primary_model = m.primary_model
@@ -352,6 +443,7 @@ function loadFromMonitor(m: ChannelMonitor) {
   form.extra_headers = { ...(m.extra_headers || {}) }
   form.body_override_mode = m.body_override_mode || 'off'
   form.body_override = m.body_override ? { ...m.body_override } : null
+  suppressFormWatchers = false
 }
 
 // Re-sync form whenever the dialog is opened or the target monitor changes.
@@ -404,6 +496,7 @@ function buildPayload(): CreateParams {
   return {
     name: form.name.trim(),
     provider: form.provider,
+    api_mode: form.provider === PROVIDER_OPENAI ? form.api_mode : API_MODE_CHAT_COMPLETIONS,
     endpoint: form.endpoint.trim(),
     api_key: form.api_key.trim(),
     primary_model: form.primary_model.trim(),
diff --git a/frontend/src/components/admin/monitor/MonitorTemplateApplyPickerDialog.vue b/frontend/src/components/admin/monitor/MonitorTemplateApplyPickerDialog.vue
index 427b75ff..6c9ca38b 100644
--- a/frontend/src/components/admin/monitor/MonitorTemplateApplyPickerDialog.vue
+++ b/frontend/src/components/admin/monitor/MonitorTemplateApplyPickerDialog.vue
@@ -56,6 +56,7 @@
           />
           <span class="font-medium text-gray-900 dark:text-white">{{ m.name }}</span>
           <span class="text-xs text-gray-400">{{ m.provider }}</span>
+          <span v-if="m.provider === 'openai'" class="text-xs text-gray-400">{{ m.api_mode }}</span>
           <span
             v-if="!m.enabled"
             class="ml-auto rounded bg-gray-100 px-1.5 py-0.5 text-xs text-gray-500 dark:bg-dark-700 dark:text-gray-400"
diff --git a/frontend/src/components/admin/monitor/MonitorTemplateManagerDialog.vue b/frontend/src/components/admin/monitor/MonitorTemplateManagerDialog.vue
index 3a03f5bc..e54ecf63 100644
--- a/frontend/src/components/admin/monitor/MonitorTemplateManagerDialog.vue
+++ b/frontend/src/components/admin/monitor/MonitorTemplateManagerDialog.vue
@@ -65,6 +65,13 @@
               >
                 {{ modeLabel(tpl.body_override_mode) }}
               </span>
+              <span
+                v-if="tpl.provider === PROVIDER_OPENAI"
+                class="inline-flex items-center rounded-md px-1.5 py-0.5 text-xs"
+                :class="apiModeBadgeClass(tpl.api_mode)"
+              >
+                {{ apiModeLabel(tpl.api_mode) }}
+              </span>
               <span
                 v-if="tpl.associated_monitors > 0"
                 class="text-xs text-gray-500 dark:text-gray-400"
@@ -137,6 +144,23 @@
         </div>
       </div>
 
+      <div v-if="form.provider === PROVIDER_OPENAI" class="rounded-lg border border-blue-100 bg-blue-50/50 p-3 dark:border-blue-500/20 dark:bg-blue-500/10">
+        <label class="input-label">{{ t('admin.channelMonitor.form.apiMode') }}</label>
+        <div class="grid gap-3 sm:grid-cols-2">
+          <button
+            v-for="opt in apiModeOptions"
+            :key="opt.value"
+            type="button"
+            class="rounded-lg border-2 px-3 py-2 text-left transition-colors"
+            :class="apiModeButtonClass(opt.value)"
+            @click="form.api_mode = opt.value"
+          >
+            <span class="block text-sm font-semibold">{{ opt.label }}</span>
+            <span class="mt-0.5 block text-xs opacity-80">{{ opt.hint }}</span>
+          </button>
+        </div>
+      </div>
+
       <div>
         <label class="input-label">
           {{ t('admin.channelMonitor.template.form.description') }}
@@ -150,6 +174,8 @@
       </div>
 
       <MonitorAdvancedRequestConfig
+        :provider="form.provider"
+        :api-mode="form.api_mode"
         :extra-headers="form.extra_headers"
         :body-override-mode="form.body_override_mode"
         :body-override="form.body_override"
@@ -207,6 +233,7 @@ import { useAppStore } from '@/stores/app'
 import { extractApiErrorMessage } from '@/utils/apiError'
 import { adminAPI } from '@/api/admin'
 import type {
+  APIMode,
   BodyOverrideMode,
   Provider,
 } from '@/api/admin/channelMonitor'
@@ -221,6 +248,8 @@ import {
   PROVIDER_ANTHROPIC,
   PROVIDER_OPENAI,
   PROVIDER_GEMINI,
+  API_MODE_CHAT_COMPLETIONS,
+  API_MODE_RESPONSES,
 } from '@/constants/channelMonitor'
 
 const props = defineProps<{ show: boolean }>()
@@ -263,6 +292,7 @@ interface TemplateForm {
   id: number | null
   name: string
   provider: Provider
+  api_mode: APIMode
   description: string
   extra_headers: Record<string, string>
   body_override_mode: BodyOverrideMode
@@ -278,6 +308,7 @@ function emptyForm(provider: Provider): TemplateForm {
     id: null,
     name: '',
     provider,
+    api_mode: API_MODE_CHAT_COMPLETIONS,
     description: '',
     extra_headers: {},
     body_override_mode: 'off',
@@ -289,6 +320,7 @@ function loadForm(tpl: ChannelMonitorTemplate) {
   form.id = tpl.id
   form.name = tpl.name
   form.provider = tpl.provider
+  form.api_mode = normalizeAPIMode(tpl.api_mode)
   form.description = tpl.description
   form.extra_headers = { ...(tpl.extra_headers || {}) }
   form.body_override_mode = tpl.body_override_mode
@@ -346,6 +378,7 @@ async function handleSubmit() {
       await adminAPI.channelMonitorTemplate.create({
         name: form.name.trim(),
         provider: form.provider,
+        api_mode: form.provider === PROVIDER_OPENAI ? form.api_mode : API_MODE_CHAT_COMPLETIONS,
         description: form.description.trim(),
         extra_headers: form.extra_headers,
         body_override_mode: form.body_override_mode,
@@ -355,6 +388,7 @@ async function handleSubmit() {
     } else if (typeof editing.value === 'number') {
       await adminAPI.channelMonitorTemplate.update(editing.value, {
         name: form.name.trim(),
+        api_mode: form.provider === PROVIDER_OPENAI ? form.api_mode : API_MODE_CHAT_COMPLETIONS,
         description: form.description.trim(),
         extra_headers: form.extra_headers,
         body_override_mode: form.body_override_mode,
@@ -444,4 +478,48 @@ function modeBadgeClass(mode: BodyOverrideMode): string {
 function modeLabel(mode: BodyOverrideMode): string {
   return t(`admin.channelMonitor.advanced.bodyMode${mode.charAt(0).toUpperCase()}${mode.slice(1)}`)
 }
+
+const apiModeOptions = computed<{ value: APIMode; label: string; hint: string }[]>(() => [
+  {
+    value: API_MODE_CHAT_COMPLETIONS,
+    label: t('admin.channelMonitor.form.apiModeChatCompletions'),
+    hint: t('admin.channelMonitor.form.apiModeChatCompletionsHint'),
+  },
+  {
+    value: API_MODE_RESPONSES,
+    label: t('admin.channelMonitor.form.apiModeResponses'),
+    hint: t('admin.channelMonitor.form.apiModeResponsesHint'),
+  },
+])
+
+watch(() => form.provider, (provider) => {
+  if (provider !== PROVIDER_OPENAI) {
+    form.api_mode = API_MODE_CHAT_COMPLETIONS
+  }
+})
+
+function normalizeAPIMode(mode: APIMode | undefined | null): APIMode {
+  return mode === API_MODE_RESPONSES ? API_MODE_RESPONSES : API_MODE_CHAT_COMPLETIONS
+}
+
+function apiModeButtonClass(mode: APIMode): string {
+  const active = form.api_mode === mode
+  if (active) {
+    return 'border-primary-500 bg-white text-primary-700 shadow-sm dark:border-primary-400 dark:bg-primary-500/15 dark:text-primary-300'
+  }
+  return 'border-blue-100 bg-white/70 text-gray-600 hover:border-primary-300 dark:border-dark-700 dark:bg-dark-800 dark:text-gray-400'
+}
+
+function apiModeLabel(mode: APIMode): string {
+  return normalizeAPIMode(mode) === API_MODE_RESPONSES
+    ? t('admin.channelMonitor.form.apiModeResponses')
+    : t('admin.channelMonitor.form.apiModeChatCompletions')
+}
+
+function apiModeBadgeClass(mode: APIMode): string {
+  if (normalizeAPIMode(mode) === API_MODE_RESPONSES) {
+    return 'bg-blue-100 text-blue-700 dark:bg-blue-500/15 dark:text-blue-300'
+  }
+  return 'bg-emerald-100 text-emerald-700 dark:bg-emerald-500/15 dark:text-emerald-300'
+}
 </script>
diff --git a/frontend/src/constants/channelMonitor.ts b/frontend/src/constants/channelMonitor.ts
index 7523a878..eb99680c 100644
--- a/frontend/src/constants/channelMonitor.ts
+++ b/frontend/src/constants/channelMonitor.ts
@@ -7,18 +7,26 @@
  * `useChannelMonitorFormat`.
  */
 
-import type { Provider, MonitorStatus } from '@/api/admin/channelMonitor'
+import type { APIMode, Provider, MonitorStatus } from '@/api/admin/channelMonitor'
 
 export const PROVIDER_OPENAI: Provider = 'openai'
 export const PROVIDER_ANTHROPIC: Provider = 'anthropic'
 export const PROVIDER_GEMINI: Provider = 'gemini'
 
+export const API_MODE_CHAT_COMPLETIONS: APIMode = 'chat_completions'
+export const API_MODE_RESPONSES: APIMode = 'responses'
+
 export const PROVIDERS: readonly Provider[] = [
   PROVIDER_OPENAI,
   PROVIDER_ANTHROPIC,
   PROVIDER_GEMINI,
 ]
 
+export const API_MODES: readonly APIMode[] = [
+  API_MODE_CHAT_COMPLETIONS,
+  API_MODE_RESPONSES,
+]
+
 export const STATUS_OPERATIONAL: MonitorStatus = 'operational'
 export const STATUS_DEGRADED: MonitorStatus = 'degraded'
 export const STATUS_FAILED: MonitorStatus = 'failed'
diff --git a/frontend/src/i18n/locales/en.ts b/frontend/src/i18n/locales/en.ts
index 1eea64a4..3048c0e6 100644
--- a/frontend/src/i18n/locales/en.ts
+++ b/frontend/src/i18n/locales/en.ts
@@ -2627,6 +2627,11 @@ export default {
         name: 'Name',
         namePlaceholder: 'Enter monitor name',
         provider: 'Platform',
+        apiMode: 'OpenAI protocol',
+        apiModeChatCompletions: 'OpenAI Compatible',
+        apiModeChatCompletionsHint: 'Use /v1/chat/completions with messages; works for most compatible providers.',
+        apiModeResponses: 'Responses API',
+        apiModeResponsesHint: 'Use /v1/responses with default instructions + input; best for self-check/Codex paths.',
         endpoint: 'Endpoint',
         endpointPlaceholder: 'https://api.example.com',
         useCurrentDomain: 'Use current service',
diff --git a/frontend/src/i18n/locales/zh.ts b/frontend/src/i18n/locales/zh.ts
index 91565bca..fe478c55 100644
--- a/frontend/src/i18n/locales/zh.ts
+++ b/frontend/src/i18n/locales/zh.ts
@@ -2704,6 +2704,11 @@ export default {
         name: '名称',
         namePlaceholder: '输入监控名称',
         provider: '平台',
+        apiMode: 'OpenAI 协议',
+        apiModeChatCompletions: 'OpenAI Compatible',
+        apiModeChatCompletionsHint: '使用 /v1/chat/completions，发送 messages；适合大多数兼容站。',
+        apiModeResponses: 'Responses API',
+        apiModeResponsesHint: '使用 /v1/responses，默认带 instructions + input；适合本站自检/Codex。',
         endpoint: '上游地址',
         endpointPlaceholder: 'https://api.example.com',
         useCurrentDomain: '使用当前服务',