diff --git a/python/packages/openai/agent_framework_openai/_chat_client.py b/python/packages/openai/agent_framework_openai/_chat_client.py
index e1686b071a..2aeb8b05f9 100644
--- a/python/packages/openai/agent_framework_openai/_chat_client.py
+++ b/python/packages/openai/agent_framework_openai/_chat_client.py
@@ -196,7 +196,7 @@ class ReasoningOptions(TypedDict, total=False):
     See: https://platform.openai.com/docs/guides/reasoning
     """
 
-    effort: Literal["none", "low", "medium", "high", "xhigh"]
+    effort: Literal["none", "low", "medium", "high", "xhigh", "max"]
     """The effort level for reasoning. Higher effort means more reasoning tokens."""
 
     summary: Literal["auto", "concise", "detailed"]