Realtime: allow arbitrarily sized messages (#1500)

rm-openai · web-flow · commit 992faf730c59 · 2025-08-15T17:10:06.000-04:00
@rzhao-openai was seeing errors about incoming messages being too large. Turns out there's a default limit of 2**20 = 1,048,576 bytes.
diff --git a/src/agents/realtime/openai_realtime.py b/src/agents/realtime/openai_realtime.py
@@ -170,7 +170,10 @@ async def connect(self, options: RealtimeModelConfig) -> None:
             "OpenAI-Beta": "realtime=v1",
         }
         self._websocket = await websockets.connect(
-            url, user_agent_header=_USER_AGENT, additional_headers=headers
+            url,
+            user_agent_header=_USER_AGENT,
+            additional_headers=headers,
+            max_size=None,  # Allow any size of message
         )
         self._websocket_task = asyncio.create_task(self._listen_for_messages())
         await self._update_session_config(model_settings)

Original file line number	Diff line number	Diff line change
`@@ -170,7 +170,10 @@ async def connect(self, options: RealtimeModelConfig) -> None:`
`170`	`170`	`"OpenAI-Beta": "realtime=v1",`
`171`	`171`	`}`
`172`	`172`	`self._websocket = await websockets.connect(`
`173`		`- url, user_agent_header=_USER_AGENT, additional_headers=headers`
	`173`	`+ url,`
	`174`	`+ user_agent_header=_USER_AGENT,`
	`175`	`+ additional_headers=headers,`
	`176`	`+ max_size=None, # Allow any size of message`
`174`	`177`	`)`
`175`	`178`	`self._websocket_task = asyncio.create_task(self._listen_for_messages())`
`176`	`179`	`await self._update_session_config(model_settings)`