diff --git a/src/openai/resources/beta/realtime/realtime.py b/src/openai/resources/beta/realtime/realtime.py
index 8e1b558cf3..af9ca6cf77 100644
--- a/src/openai/resources/beta/realtime/realtime.py
+++ b/src/openai/resources/beta/realtime/realtime.py
@@ -283,7 +283,7 @@ async def recv_bytes(self) -> bytes:
 
     async def send(self, event: RealtimeClientEvent | RealtimeClientEventParam) -> None:
         data = (
-            event.to_json(use_api_names=True, exclude_defaults=True, exclude_unset=True)
+            event.to_json(use_api_names=True, exclude_unset=True)
             if isinstance(event, BaseModel)
             else json.dumps(await async_maybe_transform(event, RealtimeClientEventParam))
         )
@@ -465,7 +465,7 @@ def recv_bytes(self) -> bytes:
 
     def send(self, event: RealtimeClientEvent | RealtimeClientEventParam) -> None:
         data = (
-            event.to_json(use_api_names=True, exclude_defaults=True, exclude_unset=True)
+            event.to_json(use_api_names=True, exclude_unset=True)
             if isinstance(event, BaseModel)
             else json.dumps(maybe_transform(event, RealtimeClientEventParam))
         )