diff --git a/src/api/strategy.js b/src/api/strategy.js
index 3b29a13e..ee4e7bad 100644
--- a/src/api/strategy.js
+++ b/src/api/strategy.js
@@ -16,6 +16,7 @@ const api = {
   verifyCode: '/api/strategies/verify',
   aiGenerate: '/api/strategies/generate',
   aiWorkspace: '/api/strategies/ai-workspace',
+  aiWorkspaceAccountModels: '/api/strategies/ai-workspace/account-models',
   scriptTemplates: '/api/strategies/script-templates',
   reviewReport: '/api/strategies/review-report',
   reviewReportHistory: '/api/strategies/review-report/history',
@@ -253,6 +254,13 @@ export function runStrategyAiTurn (data) {
   })
 }
 
+export function getStrategyAiAccountModels () {
+  return request({
+    url: api.aiWorkspaceAccountModels,
+    method: 'get'
+  })
+}
+
 export function setStrategyAiCandidateStatus (changeId, status) {
   return request({
     url: `${api.aiWorkspace}/changes/${changeId}/status`,
diff --git a/src/views/strategy-ide/index.vue b/src/views/strategy-ide/index.vue
index cf4a93d9..0d9a59fa 100644
--- a/src/views/strategy-ide/index.vue
+++ b/src/views/strategy-ide/index.vue
@@ -303,6 +303,24 @@
                   </div>
 
                   <div class="strategy-ai-composer">
+                    <div class="strategy-ai-auth-row">
+                      <a-select v-model="aiAuthMode" size="small" style="width: 160px">
+                        <a-select-option value="chatgpt_account">ChatGPT account</a-select-option>
+                        <a-select-option value="api_key">API key</a-select-option>
+                      </a-select>
+                      <a-select
+                        v-if="aiAuthMode === 'chatgpt_account'"
+                        v-model="aiAccountModel"
+                        size="small"
+                        style="min-width: 180px"
+                        :loading="aiAccountModelsLoading"
+                      >
+                        <a-select-option v-for="item in aiAccountModels" :key="item.id" :value="item.id">
+                          {{ item.name || item.id }}
+                        </a-select-option>
+                      </a-select>
+                      <span class="strategy-ai-auth-hint">{{ aiAuthMode === 'chatgpt_account' ? 'ChatGPT plan · no API-key fallback' : 'Explicit API billing mode' }}</span>
+                    </div>
                     <a-textarea
                       ref="strategyAiPrompt"
                       v-model="aiStrategyPrompt"
@@ -683,6 +701,7 @@ import {
   deleteScriptSource,
   getIndicatorListForStrategy,
   getStrategyAiWorkspace,
+  getStrategyAiAccountModels,
   getScriptSourcePublishReadiness,
   getScriptSourceDetail,
   getScriptSourceList,
@@ -769,6 +788,10 @@ export default {
       aiStrategyPrompt: '',
       aiStrategyGenerating: false,
       aiInteractionMode: 'auto',
+      aiAuthMode: 'chatgpt_account',
+      aiAccountModel: 'gpt-6-luna',
+      aiAccountModels: [],
+      aiAccountModelsLoading: false,
       aiRequestBaseCode: '',
       strategyValidation: null,
       showIndicatorConvertModal: false,
@@ -1074,6 +1097,7 @@ export default {
     window.addEventListener('keydown', this._saveShortcut, true)
     this._initialPagePromise = this.initPage()
     this.initializeStrategyBuilderOptions()
+    this.loadStrategyAiAccountModels()
   },
   activated () {
     if (this._saveShortcut) {
@@ -1331,6 +1355,21 @@ export default {
       this.aiStrategyPrompt = ''
       this.aiInteractionMode = 'auto'
     },
+    async loadStrategyAiAccountModels () {
+      this.aiAccountModelsLoading = true
+      try {
+        const res = await getStrategyAiAccountModels()
+        const data = (res && res.data) || {}
+        this.aiAccountModels = Array.isArray(data.models) ? data.models : []
+        if (this.aiAccountModels.length && !this.aiAccountModels.some(item => item.id === this.aiAccountModel)) {
+          this.aiAccountModel = this.aiAccountModels[0].id
+        }
+      } catch (e) {
+        this.aiAccountModels = []
+      } finally {
+        this.aiAccountModelsLoading = false
+      }
+    },
     async loadStrategyAiWorkspace (sourceId) {
       const id = Number(sourceId || 0)
       if (!id || this.scriptCodeHidden) {
@@ -1433,6 +1472,8 @@ export default {
           existingCode,
           interactionMode,
           generationMode: 'authoring',
+          authMode: this.aiAuthMode,
+          model: this.aiAuthMode === 'chatgpt_account' ? this.aiAccountModel : undefined,
           context: { source: 'strategy_ide' }
         })
         const data = (res && res.data) || {}
@@ -3054,6 +3095,18 @@ export default {
   background: #fff;
 }
 
+.strategy-ai-auth-row {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  margin-bottom: 8px;
+}
+
+.strategy-ai-auth-hint {
+  color: #7f8a9b;
+  font-size: 12px;
+}
+
 .strategy-ai-workspace--collapsed {
   min-height: 42px;
   height: 42px;
diff --git a/tests/unit/strategyAiWorkspace.test.mjs b/tests/unit/strategyAiWorkspace.test.mjs
index 2446ec8d..34cdccb3 100644
--- a/tests/unit/strategyAiWorkspace.test.mjs
+++ b/tests/unit/strategyAiWorkspace.test.mjs
@@ -39,6 +39,17 @@ test('strategy AI workspace keeps memory source-bound and uses explicit candidat
   assert.match(page, /currentAssetType \(\) \{[\s\S]*this\.aiStrategyPrompt = ''[\s\S]*this\.aiInteractionMode = 'auto'/)
 })
 
+test('strategy AI workspace exposes explicit account and API-key modes without fallback', () => {
+  const api = read('src/api/strategy.js')
+  const page = read('src/views/strategy-ide/index.vue')
+  assert.match(page, /value="chatgpt_account">ChatGPT account/)
+  assert.match(page, /value="api_key">API key/)
+  assert.match(page, /no API-key fallback/)
+  assert.match(page, /authMode: this\.aiAuthMode/)
+  assert.match(page, /model: this\.aiAuthMode === 'chatgpt_account'/)
+  assert.match(api, /aiWorkspaceAccountModels: '\/api\/strategies\/ai-workspace\/account-models'/)
+})
+
 test('hidden purchased strategies show a locked AI workspace and never load or send source context', () => {
   const page = read('src/views/strategy-ide/index.vue')
   assert.match(page, /v-if="scriptCodeHidden" class="strategy-ai-locked"/)