diff --git a/src/server/__tests__/settings.test.ts b/src/server/__tests__/settings.test.ts
index 99ceb622..55236f09 100644
--- a/src/server/__tests__/settings.test.ts
+++ b/src/server/__tests__/settings.test.ts
@@ -13,6 +13,7 @@ import { handleModelsApi } from '../api/models.js'
 import { handleStatusApi, resetUsage, addUsage } from '../api/status.js'
 import { ProviderService } from '../services/providerService.js'
 import { hahaOAuthService } from '../services/hahaOAuthService.js'
+import { hahaOpenAIOAuthService } from '../services/hahaOpenAIOAuthService.js'
 import {
   clearOpenAICodexModelCatalogCache,
 } from '../../services/openaiAuth/modelCatalog.js'
@@ -1162,6 +1163,55 @@ describe('Models API', () => {
     })
   })
 
+  it('GET /api/models discovers models using the desktop ChatGPT account', async () => {
+    const providerSvc = new ProviderService()
+    await providerSvc.activateProvider('openai-official')
+    await hahaOpenAIOAuthService.saveTokens({
+      accessToken: 'desktop-catalog-token',
+      refreshToken: null,
+      expiresAt: null,
+      accountId: 'desktop-account',
+      email: 'desktop@example.test',
+    })
+    const originalFetch = globalThis.fetch
+    const requests: Headers[] = []
+    clearOpenAICodexModelCatalogCache()
+    globalThis.fetch = (async (_input, init) => {
+      requests.push(new Headers(init?.headers))
+      return Response.json({ models: [{
+        slug: 'gpt-desktop-account-only',
+        display_name: 'Desktop account model',
+        visibility: 'list',
+        default_reasoning_level: 'high',
+        supported_reasoning_levels: [{ effort: 'low' }, { effort: 'high' }],
+        context_window: 300_000,
+      }] })
+    }) as typeof fetch
+    try {
+      const { req, url, segments } = makeRequest('GET', '/api/models')
+      expect((await handleModelsApi(req, url, segments)).status).toBe(200)
+      // Let the immediate background catalog response settle before reading it.
+      await new Promise(resolve => setTimeout(resolve, 0))
+      const res = await handleModelsApi(req, url, segments)
+      expect(res.status).toBe(200)
+      const body = await res.json()
+      expect(body.models).toEqual([{
+        id: 'gpt-desktop-account-only',
+        name: 'Desktop account model',
+        description: '',
+        context: '285000',
+        defaultReasoningEffort: 'high',
+        supportedReasoningEfforts: ['low', 'high'],
+      }])
+      expect(requests).toHaveLength(1)
+      expect(requests[0]?.get('Authorization')).toBe('Bearer desktop-catalog-token')
+      expect(requests[0]?.get('ChatGPT-Account-Id')).toBe('desktop-account')
+    } finally {
+      globalThis.fetch = originalFetch
+      clearOpenAICodexModelCatalogCache()
+    }
+  })
+
   it('PUT /api/models/current should persist GPT model to managed settings when ChatGPT Official is active', async () => {
     const settingsSvc = new SettingsService()
     const providerSvc = new ProviderService()
diff --git a/src/server/api/models.ts b/src/server/api/models.ts
index 5e11bcff..b1da9da4 100644
--- a/src/server/api/models.ts
+++ b/src/server/api/models.ts
@@ -14,6 +14,7 @@ import { attributionHeaderEnvForModel } from '../services/attributionHeaderPolic
 import { ApiError, errorResponse } from '../middleware/errorHandler.js'
 import { hasOpenAIAuthLogin } from '../../utils/auth.js'
 import { getOpenAICodexModelCatalog } from '../../services/openaiAuth/modelCatalog.js'
+import { getDesktopOpenAICodexModelCatalog } from '../services/openaiModelCatalog.js'
 import {
   OPENAI_DEFAULT_MAIN_MODEL,
   type OpenAIModelCatalogEntry,
@@ -188,7 +189,7 @@ function buildOpenAIModelList(catalog: OpenAIModelCatalogEntry[]): ApiModelInfo[
 }
 
 async function getOpenAIModelList(): Promise<ApiModelInfo[]> {
-  return buildOpenAIModelList(await getOpenAICodexModelCatalog())
+  return buildOpenAIModelList(await getDesktopOpenAICodexModelCatalog())
 }
 
 function buildGrokModelList(catalog: GrokModelCatalogEntry[]): ApiModelInfo[] {
@@ -236,7 +237,7 @@ async function getOpenAIAuthModels(): Promise<ApiModelInfo[]> {
     return []
   }
 
-  return getOpenAIModelList()
+  return buildOpenAIModelList(await getOpenAICodexModelCatalog())
 }
 
 async function getStandaloneModelList(): Promise<ApiModelInfo[]> {
diff --git a/src/server/services/openaiModelCatalog.test.ts b/src/server/services/openaiModelCatalog.test.ts
new file mode 100644
index 00000000..e7f950e2
--- /dev/null
+++ b/src/server/services/openaiModelCatalog.test.ts
@@ -0,0 +1,95 @@
+import { afterEach, beforeEach, describe, expect, test } from 'bun:test'
+import { mkdtemp, rm, writeFile } from 'node:fs/promises'
+import { tmpdir } from 'node:os'
+import { join } from 'node:path'
+import { clearOpenAICodexModelCatalogCache } from '../../services/openaiAuth/modelCatalog.js'
+import { OPENAI_CODEX_MODEL_CATALOG } from '../../services/openaiAuth/models.js'
+import { clearOpenAIOAuthTokenCache } from '../../services/openaiAuth/storage.js'
+import { hahaOpenAIOAuthService } from './hahaOpenAIOAuthService.js'
+import { getDesktopOpenAICodexModelCatalog } from './openaiModelCatalog.js'
+
+describe('desktop OpenAI model catalog credentials', () => {
+  let directory: string
+  let originalConfig: string | undefined
+  let originalTokenFile: string | undefined
+
+  beforeEach(async () => {
+    directory = await mkdtemp(join(tmpdir(), 'desktop-openai-models-'))
+    originalConfig = process.env.CLAUDE_CONFIG_DIR
+    originalTokenFile = process.env.OPENAI_CODEX_OAUTH_FILE
+    process.env.CLAUDE_CONFIG_DIR = directory
+    process.env.OPENAI_CODEX_OAUTH_FILE = join(directory, 'cli-oauth.json')
+    await writeFile(process.env.OPENAI_CODEX_OAUTH_FILE, JSON.stringify({
+      accessToken: 'other-cli-token',
+      accountId: 'other-cli-account',
+      expiresAt: Date.now() + 3_600_000,
+    }))
+    clearOpenAIOAuthTokenCache()
+    clearOpenAICodexModelCatalogCache()
+  })
+
+  afterEach(async () => {
+    if (originalConfig === undefined) delete process.env.CLAUDE_CONFIG_DIR
+    else process.env.CLAUDE_CONFIG_DIR = originalConfig
+    if (originalTokenFile === undefined) delete process.env.OPENAI_CODEX_OAUTH_FILE
+    else process.env.OPENAI_CODEX_OAUTH_FILE = originalTokenFile
+    clearOpenAIOAuthTokenCache()
+    clearOpenAICodexModelCatalogCache()
+    await rm(directory, { recursive: true, force: true })
+  })
+
+  const saveAccount = async (accountId: string) => {
+    await hahaOpenAIOAuthService.saveTokens({
+      accessToken: `desktop-token-${accountId}`,
+      refreshToken: null,
+      expiresAt: null,
+      accountId,
+      email: `${accountId}@example.test`,
+    })
+  }
+
+  test('uses desktop credentials and isolates account switches and logout from CLI credentials', async () => {
+    const requests: Headers[] = []
+    const fetchOverride: typeof fetch = (async (_input, init) => {
+      const headers = new Headers(init?.headers)
+      requests.push(headers)
+      return Response.json({ models: [{
+        slug: `model-${headers.get('ChatGPT-Account-Id')}`,
+        display_name: 'Account model',
+        visibility: 'list',
+      }] })
+    }) as typeof fetch
+
+    await saveAccount('account-a')
+    const first = await getDesktopOpenAICodexModelCatalog({ fetchOverride, forceRefresh: true })
+    expect(first.map(model => model.value)).toEqual(['model-account-a'])
+    expect(requests[0]?.get('Authorization')).toBe('Bearer desktop-token-account-a')
+    expect(requests[0]?.get('ChatGPT-Account-Id')).toBe('account-a')
+    expect(await getDesktopOpenAICodexModelCatalog({ fetchOverride })).toEqual(first)
+    expect(requests).toHaveLength(1)
+
+    await saveAccount('account-b')
+    const second = await getDesktopOpenAICodexModelCatalog({ fetchOverride, forceRefresh: true })
+    expect(second.map(model => model.value)).toEqual(['model-account-b'])
+    expect(requests[1]?.get('Authorization')).toBe('Bearer desktop-token-account-b')
+    expect(await getDesktopOpenAICodexModelCatalog({ fetchOverride })).toEqual(second)
+
+    await hahaOpenAIOAuthService.deleteTokens()
+    expect(await getDesktopOpenAICodexModelCatalog({ fetchOverride, forceRefresh: true }))
+      .toEqual(OPENAI_CODEX_MODEL_CATALOG)
+    expect(requests).toHaveLength(2)
+  })
+
+  test('unreadable desktop tokens fall back without consulting CLI credentials', async () => {
+    await saveAccount('account-a')
+    await writeFile(hahaOpenAIOAuthService.getOAuthFilePath(), 'invalid JSON')
+    let calls = 0
+    const fetchOverride = (async () => {
+      calls += 1
+      throw new Error('unexpected request')
+    }) as typeof fetch
+    expect(await getDesktopOpenAICodexModelCatalog({ fetchOverride, forceRefresh: true }))
+      .toEqual(OPENAI_CODEX_MODEL_CATALOG)
+    expect(calls).toBe(0)
+  })
+})
diff --git a/src/server/services/openaiModelCatalog.ts b/src/server/services/openaiModelCatalog.ts
new file mode 100644
index 00000000..613a68c6
--- /dev/null
+++ b/src/server/services/openaiModelCatalog.ts
@@ -0,0 +1,11 @@
+import { getOpenAICodexModelCatalog } from '../../services/openaiAuth/modelCatalog.js'
+import { hahaOpenAIOAuthService } from './hahaOpenAIOAuthService.js'
+
+/** Desktop discovery must use the same account as its official provider runtime. */
+export async function getDesktopOpenAICodexModelCatalog(options?: {
+  fetchOverride?: typeof fetch
+  forceRefresh?: boolean
+}) {
+  const tokens = await hahaOpenAIOAuthService.ensureFreshTokens().catch(() => null)
+  return getOpenAICodexModelCatalog({ ...options, tokens })
+}
diff --git a/src/server/ws/handler.ts b/src/server/ws/handler.ts
index f5730049..18b218c8 100644
--- a/src/server/ws/handler.ts
+++ b/src/server/ws/handler.ts
@@ -32,7 +32,7 @@ import {
 } from '../services/providerRuntimeEnv.js'
 import { isOpenAIOfficialProviderId } from '../services/openaiOfficialProvider.js'
 import { isGrokOfficialProviderId } from '../services/grokOfficialProvider.js'
-import { getOpenAICodexModelCatalog } from '../../services/openaiAuth/modelCatalog.js'
+import { getDesktopOpenAICodexModelCatalog } from '../services/openaiModelCatalog.js'
 import {
   OPENAI_DEFAULT_MAIN_MODEL,
   getOpenAIModelCatalogEntry,
@@ -4097,7 +4097,7 @@ type RuntimeSettings = {
 }
 
 async function getDefaultOpenAIReasoningEffort(modelId: string): Promise<string> {
-  const catalog = await getOpenAICodexModelCatalog()
+  const catalog = await getDesktopOpenAICodexModelCatalog()
   return getOpenAIModelCatalogEntry(modelId, catalog)?.defaultReasoningEffort ?? 'medium'
 }
 
@@ -4142,7 +4142,7 @@ async function resolveRuntimeEffort(
       return { valid: false }
     }
 
-    const catalog = await getOpenAICodexModelCatalog()
+    const catalog = await getDesktopOpenAICodexModelCatalog()
     const model = getOpenAIModelCatalogEntry(modelId, catalog)
     return !model || model.supportedReasoningEfforts.includes(effort)
       ? { valid: true, effort }
diff --git a/src/services/openaiAuth/client.test.ts b/src/services/openaiAuth/client.test.ts
index f7abe58d..feb3107d 100644
--- a/src/services/openaiAuth/client.test.ts
+++ b/src/services/openaiAuth/client.test.ts
@@ -75,7 +75,7 @@ describe('OpenAI Codex OAuth client', () => {
         'application/x-www-form-urlencoded',
       )
       expect(tokenRequestHeaders.get('User-Agent')).toBe(
-        OPENAI_CODEX_TOKEN_USER_AGENT,
+        'codex-cli/0.153.4',
       )
       expect(tokenRequestBody).toContain('grant_type=authorization_code')
       expect(tokenRequestBody).toContain('client_id=app_EMoamEEZ73f0CkXaXp7hrann')
diff --git a/src/services/openaiAuth/client.ts b/src/services/openaiAuth/client.ts
index de3853a2..1739a6c4 100644
--- a/src/services/openaiAuth/client.ts
+++ b/src/services/openaiAuth/client.ts
@@ -11,7 +11,7 @@ export const OPENAI_AUTH_ISSUER = 'https://auth.openai.com'
 export const OPENAI_CODEX_CLIENT_ID = 'app_EMoamEEZ73f0CkXaXp7hrann'
 export const OPENAI_CODEX_API_ENDPOINT =
   'https://chatgpt.com/backend-api/codex/responses'
-export const OPENAI_CODEX_CLIENT_VERSION = '0.144.0'
+export const OPENAI_CODEX_CLIENT_VERSION = '0.153.4'
 export const OPENAI_CODEX_ORIGINATOR = 'codex_cli_rs'
 export const OPENAI_CODEX_OAUTH_PORT = 1455
 export const OPENAI_CODEX_REDIRECT_PATH = '/auth/callback'
diff --git a/src/services/openaiAuth/modelCatalog.test.ts b/src/services/openaiAuth/modelCatalog.test.ts
index 4edead08..b7541b8f 100644
--- a/src/services/openaiAuth/modelCatalog.test.ts
+++ b/src/services/openaiAuth/modelCatalog.test.ts
@@ -92,6 +92,34 @@ describe('OpenAI Codex model catalog', () => {
     ])
   })
 
+  test('uses explicitly supplied credentials instead of CLI storage', async () => {
+    const models = await getOpenAICodexModelCatalog({
+      tokens: { accessToken: 'desktop-token', accountId: 'desktop-account' },
+      forceRefresh: true,
+      fetchOverride: async (_input, init) => {
+        const headers = new Headers(init?.headers)
+        expect(headers.get('Authorization')).toBe('Bearer desktop-token')
+        expect(headers.get('ChatGPT-Account-Id')).toBe('desktop-account')
+        return Response.json({ models: [{ slug: 'gpt-6-astra', visibility: 'list' }] })
+      },
+    })
+    expect(models.map(model => model.value)).toEqual(['gpt-6-astra'])
+  })
+
+  test('explicit logout never requests a catalog with CLI credentials', async () => {
+    let requests = 0
+    const models = await getOpenAICodexModelCatalog({
+      tokens: null,
+      forceRefresh: true,
+      fetchOverride: async () => {
+        requests += 1
+        return Response.json({ models: [{ slug: 'cli-only', visibility: 'list' }] })
+      },
+    })
+    expect(requests).toBe(0)
+    expect(models).toEqual(OPENAI_CODEX_MODEL_CATALOG)
+  })
+
   test('falls back to the bundled GPT-5.6 catalog when the endpoint fails', async () => {
     const models = await getOpenAICodexModelCatalog({
       forceRefresh: true,
diff --git a/src/services/openaiAuth/modelCatalog.ts b/src/services/openaiAuth/modelCatalog.ts
index e672b245..0dae22ed 100644
--- a/src/services/openaiAuth/modelCatalog.ts
+++ b/src/services/openaiAuth/modelCatalog.ts
@@ -93,10 +93,19 @@ function normalizeRemoteModel(model: RemoteModelInfo): OpenAIModelCatalogEntry |
   }
 }
 
+export type OpenAIModelCatalogTokens = {
+  accessToken: string
+  accountId?: string | null
+  email?: string | null
+}
+
 export async function fetchOpenAICodexModelCatalog(
   fetchOverride: typeof fetch = globalThis.fetch,
+  suppliedTokens?: OpenAIModelCatalogTokens | null,
 ): Promise<OpenAIModelCatalogEntry[]> {
-  const tokens = await ensureFreshOpenAITokens()
+  const tokens = suppliedTokens === undefined
+    ? await ensureFreshOpenAITokens()
+    : suppliedTokens
   if (!tokens) {
     throw new Error('OpenAI OAuth token is unavailable')
   }
@@ -135,15 +144,17 @@ export async function fetchOpenAICodexModelCatalog(
 export async function getOpenAICodexModelCatalog(options?: {
   fetchOverride?: typeof fetch
   forceRefresh?: boolean
+  /** Explicit desktop credentials; null must never fall through to CLI storage. */
+  tokens?: OpenAIModelCatalogTokens | null
 }): Promise<OpenAIModelCatalogEntry[]> {
-  const tokens = getOpenAIOAuthTokens()
+  const tokens = options?.tokens === undefined ? getOpenAIOAuthTokens() : options.tokens
   const accountKey = tokens
     ? tokens.accountId ?? tokens.email ?? 'authenticated-default'
     : 'logged-out'
   return catalogCache.resolve({
     accountKey,
     fetchCatalog: async () => {
-      const models = await fetchOpenAICodexModelCatalog(options?.fetchOverride)
+      const models = await fetchOpenAICodexModelCatalog(options?.fetchOverride, options?.tokens)
       if (models.length === 0) {
         throw new Error('OpenAI models endpoint returned no visible models')
       }