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"