diff --git a/google/genai/_gaos/types/interactions/servicetier.py b/google/genai/_gaos/types/interactions/servicetier.py
index 97d60f87e..426635343 100644
--- a/google/genai/_gaos/types/interactions/servicetier.py
+++ b/google/genai/_gaos/types/interactions/servicetier.py
@@ -26,6 +26,7 @@
         "flex",
         "standard",
         "priority",
+        "deferred",
     ],
     UnrecognizedStr,
 ]