diff --git a/extensions/answer.ts b/extensions/answer.ts
index e7c9704..7e52fa3 100644
--- a/extensions/answer.ts
+++ b/extensions/answer.ts
@@ -67,7 +67,7 @@ Example output:
   ]
 }`;
 
-const CODEX_MODEL_ID = "gpt-5.3";
+const CODEX_MODEL_ID = "gpt-5.3-codex";
 const HAIKU_MODEL_ID = "claude-haiku-4-5";
 
 /**