diff --git a/generated_types.json b/generated_types.json
index 36a772a5..f741eba9 100644
--- a/generated_types.json
+++ b/generated_types.json
@@ -1305,6 +1305,9 @@
                 "items": {
                   "$ref": "#/components/schemas/ChatCompletionMessageReasoning"
                 }
+              },
+              "reasoning_signature": {
+                "type": "string"
               }
             },
             "required": [
@@ -1605,6 +1608,9 @@
                 "items": {
                   "$ref": "#/components/schemas/ChatCompletionMessageReasoning"
                 }
+              },
+              "reasoning_signature": {
+                "type": "string"
               }
             },
             "required": [
diff --git a/py/src/braintrust/_generated_types.py b/py/src/braintrust/_generated_types.py
index ff4f1ba0..c4a15701 100644
--- a/py/src/braintrust/_generated_types.py
+++ b/py/src/braintrust/_generated_types.py
@@ -416,6 +416,7 @@ class ChatCompletionOpenAIMessageParamChatCompletionOpenAIMessageParam2(TypedDic
     name: NotRequired[str | None]
     tool_calls: NotRequired[Sequence[ChatCompletionMessageToolCall] | None]
     reasoning: NotRequired[Sequence[ChatCompletionMessageReasoning] | None]
+    reasoning_signature: NotRequired[str | None]
 
 
 class ChatCompletionOpenAIMessageParamChatCompletionOpenAIMessageParam3(TypedDict):
@@ -2776,6 +2777,7 @@ class ChatCompletionMessageParamChatCompletionMessageParam2(TypedDict):
     name: NotRequired[str | None]
     tool_calls: NotRequired[Sequence[ChatCompletionMessageToolCall] | None]
     reasoning: NotRequired[Sequence[ChatCompletionMessageReasoning] | None]
+    reasoning_signature: NotRequired[str | None]
 
 
 ChatCompletionMessageParam: TypeAlias = (
diff --git a/py/src/braintrust/generated_types.py b/py/src/braintrust/generated_types.py
index 8284ba56..7a385c38 100644
--- a/py/src/braintrust/generated_types.py
+++ b/py/src/braintrust/generated_types.py
@@ -1,4 +1,4 @@
-"""Auto-generated file (content hash 9ac97be26c9575b6) -- do not modify"""
+"""Auto-generated file (content hash 2046371fcb54d28e) -- do not modify"""
 
 from ._generated_types import (
     Acl,