diff --git a/google/genai/_gaos/types/interactions/thinkinglevel.py b/google/genai/_gaos/types/interactions/thinkinglevel.py
index 816a095bf..451e31782 100644
--- a/google/genai/_gaos/types/interactions/thinkinglevel.py
+++ b/google/genai/_gaos/types/interactions/thinkinglevel.py
@@ -28,6 +28,7 @@
         "low",
         "medium",
         "high",
+        "xhigh",
     ],
     UnrecognizedStr,
 ]