feat: add gpt-5.5 to codex model catalogs

src/cliproxy/codex-plan-compatibility.ts

@@ -18,6 +18,7 @@ const KNOWN_CODEX_MODELS = new Set(
 );
 
 const FREE_PLAN_FALLBACKS = new Map<string, string>([
+  ['gpt-5.5', FREE_SAFE_DEFAULT_MODEL],
   ['gpt-5.3-codex', FREE_SAFE_DEFAULT_MODEL],
   ['gpt-5.3-codex-spark', FREE_SAFE_FAST_MODEL],
 ]);

src/cliproxy/model-catalog.ts

@@ -188,6 +188,19 @@ export const MODEL_CATALOG: Partial<Record<CLIProxyProvider, ProviderCatalog>> =
     displayName: 'Copilot Codex',
     defaultModel: 'gpt-5.4',
     models: [
+      {
+        id: 'gpt-5.5',
+        name: 'GPT-5.5',
+        tier: 'pro',
+        description:
+          'Newest Codex-released GPT-5 family model; falls back to GPT-5.4 on free plans',
+        thinking: {
+          type: 'levels',
+          levels: ['low', 'medium', 'high', 'xhigh'],
+          maxLevel: 'xhigh',
+          dynamicAllowed: false,
+        },
+      },
       {
         id: 'gpt-5.4',
         name: 'GPT-5.4',