diff --git a/python/packages/autogen-core/src/autogen_core/models/_model_client.py b/python/packages/autogen-core/src/autogen_core/models/_model_client.py
index efc3871383fd..a378f29a3d7c 100644
--- a/python/packages/autogen-core/src/autogen_core/models/_model_client.py
+++ b/python/packages/autogen-core/src/autogen_core/models/_model_client.py
@@ -81,7 +81,6 @@ def is_openai(family: str) -> bool:
             ModelFamily.O3,
             ModelFamily.GPT_4,
             ModelFamily.GPT_35,
-            ModelFamily.R1,
         )