diff --git a/api_reference/openapi.transformed.yml b/api_reference/openapi.transformed.yml
index c12baba61f..8c3be5390b 100644
--- a/api_reference/openapi.transformed.yml
+++ b/api_reference/openapi.transformed.yml
@@ -39474,9 +39474,10 @@ components:
         role:
           type: string
           description: |
-            The role of the message input. One of `user`, `system`, or `developer`.
+            The role of the message input. One of `user`, `assistant`, `system`, or `developer`.
           enum:
           - user
+          - assistant
           - system
           - developer
         status:
@@ -72326,9 +72327,10 @@ components:
         role:
           type: string
           description: |
-            The role of the message input. One of `user`, `system`, or `developer`.
+            The role of the message input. One of `user`, `assistant`, `system`, or `developer`.
           enum:
           - user
+          - assistant
           - system
           - developer
         status:
diff --git a/src/openai/types/responses/response_input_item_param.py b/src/openai/types/responses/response_input_item_param.py
index d6192ae496..47edcb275b 100644
--- a/src/openai/types/responses/response_input_item_param.py
+++ b/src/openai/types/responses/response_input_item_param.py
@@ -89,8 +89,8 @@ class Message(TypedDict, total=False):
     types.
     """
 
-    role: Required[Literal["user", "system", "developer"]]
-    """The role of the message input. One of `user`, `system`, or `developer`."""
+    role: Required[Literal["user", "assistant", "system", "developer"]]
+    """The role of the message input. One of `user`, `assistant`, `system`, or `developer`."""
 
     status: Literal["in_progress", "completed", "incomplete"]
     """The status of item.