diff --git a/openai-api-servant/src/OpenAI/Resources.hs b/openai-api-servant/src/OpenAI/Resources.hs
index 55964d6..39230f0 100644
--- a/openai-api-servant/src/OpenAI/Resources.hs
+++ b/openai-api-servant/src/OpenAI/Resources.hs
@@ -509,6 +509,7 @@ data ReasoningEffort =
   | RE_low
   | RE_medium
   | RE_high
+  | RE_xhigh
   deriving stock (Show, Eq, Generic)
   deriving anyclass NFData