diff --git a/app/config.js b/app/config.js
index 5efc5b4..4c8db14 100644
--- a/app/config.js
+++ b/app/config.js
@@ -35,7 +35,7 @@ const CLI_CANDIDATES = [
   {
     provider: 'codex',
     command: 'codex',
-    defaultModel: 'gpt-5',
+    defaultModel: 'gpt-5.4-mini',
   },
   {
     provider: 'claude',