diff --git a/src/services/models_service.py b/src/services/models_service.py
index 35f1043f..47d21024 100644
--- a/src/services/models_service.py
+++ b/src/services/models_service.py
@@ -64,7 +64,7 @@ class ModelsService:
                             {
                                 "value": model_id,
                                 "label": model_id,
-                                "default": model_id == "gpt-5",
+                                "default": model_id == "gpt-4o",
                             }
                         )