diff --git a/apps/web/src/modules/admin-ai-provider-settings/AdminAiProviderSettingsPage.vue b/apps/web/src/modules/admin-ai-provider-settings/AdminAiProviderSettingsPage.vue
index 75fae19..fb41dcc 100644
--- a/apps/web/src/modules/admin-ai-provider-settings/AdminAiProviderSettingsPage.vue
+++ b/apps/web/src/modules/admin-ai-provider-settings/AdminAiProviderSettingsPage.vue
@@ -2,6 +2,7 @@
 import { computed, onMounted, ref } from 'vue';
 import {
   CODEX_MODEL_OPTIONS,
+  DEFAULT_CODEX_MODEL,
   DEFAULT_SETTINGS,
   deleteProviderConfig,
   disconnectCodex,
@@ -30,7 +31,7 @@ const loading = ref(false);
 const saving = ref(false);
 const redirectUrl = ref('');
 const showRedirectPanel = ref(false);
-const codexModel = ref(CODEX_MODEL_OPTIONS[0]);
+const codexModel = ref<string>(DEFAULT_CODEX_MODEL);
 const openaiForm = ref({ apiKey: '', baseUrl: DEFAULT_SETTINGS.openai.baseUrl, model: DEFAULT_SETTINGS.openai.model });
 const geminiForm = ref({ apiKey: '', baseUrl: DEFAULT_SETTINGS.gemini.baseUrl, model: DEFAULT_SETTINGS.gemini.model });
 
@@ -69,7 +70,7 @@ async function loadPage(): Promise<void> {
     ]);
     settings.value = nextSettings;
     codexStatus.value = nextCodex;
-    codexModel.value = nextCodex.model || CODEX_MODEL_OPTIONS[0];
+    codexModel.value = nextCodex.model || DEFAULT_CODEX_MODEL;
     openaiForm.value = { apiKey: '', baseUrl: nextSettings.openai.baseUrl, model: nextSettings.openai.model };
     geminiForm.value = { apiKey: '', baseUrl: nextSettings.gemini.baseUrl, model: nextSettings.gemini.model };
     status.value = 'AI provider settings loaded';
diff --git a/apps/web/src/modules/admin-ai-provider-settings/api.ts b/apps/web/src/modules/admin-ai-provider-settings/api.ts
index 08e255e..f62501a 100644
--- a/apps/web/src/modules/admin-ai-provider-settings/api.ts
+++ b/apps/web/src/modules/admin-ai-provider-settings/api.ts
@@ -50,7 +50,9 @@ export const CODEX_MODEL_OPTIONS = [
   'gpt-5.4-mini',
   'gpt-5.3-codex',
   'gpt-5.2'
-];
+] as const satisfies readonly [string, ...string[]];
+
+export const DEFAULT_CODEX_MODEL = CODEX_MODEL_OPTIONS[0];
 
 export async function fetchAiProviderSettings(): Promise<AiProviderSettings> {
   return normalizeSettings(await requestAdmin<unknown>('/api/ai-provider-settings'));
@@ -151,7 +153,7 @@ function normalizeCodexStatus(payload: unknown): CodexConnectionStatus {
     connected: record.connected === true,
     keyType: record.keyType === 'oauth' ? 'oauth' : null,
     updatedAt: readString(record.updatedAt) || null,
-    model: readString(record.model) || CODEX_MODEL_OPTIONS[0],
+    model: readString(record.model) || DEFAULT_CODEX_MODEL,
     purposes: Array.isArray(record.purposes) ? record.purposes.filter((item): item is string => typeof item === 'string') : [],
     clientIdConfigured: record.clientIdConfigured !== false
   };