diff --git a/src/openai/types/websocket_connection_options.py b/src/openai/types/websocket_connection_options.py
index 0ddbf5af49..d8bfabad18 100644
--- a/src/openai/types/websocket_connection_options.py
+++ b/src/openai/types/websocket_connection_options.py
@@ -5,17 +5,17 @@
 from typing import TYPE_CHECKING
 from typing_extensions import Sequence, TypeAlias, TypedDict
 
-__all__ = ["WebSocketConnectionOptions", "WebsocketConnectionOptions"]
+__all__ = ["SyncWebSocketConnectionOptions", "WebSocketConnectionOptions", "WebsocketConnectionOptions"]
 
 if TYPE_CHECKING:
     from websockets import Subprotocol
     from websockets.extensions import ClientExtensionFactory
 
 
-class WebSocketConnectionOptions(TypedDict, total=False):
-    """WebSocket connection options copied from `websockets`.
+class SyncWebSocketConnectionOptions(TypedDict, total=False):
+    """Native options for synchronous WebSocket connections.
 
-    For example: https://websockets.readthedocs.io/en/stable/reference/asyncio/client.html#websockets.asyncio.client.connect
+    See https://websockets.readthedocs.io/en/stable/reference/sync/client.html#websockets.sync.client.connect
     """
 
     extensions: Sequence[ClientExtensionFactory] | None
@@ -32,7 +32,14 @@ class WebSocketConnectionOptions(TypedDict, total=False):
     """Maximum size of incoming messages in bytes. None disables the limit."""
 
     max_queue: int | None | tuple[int | None, int | None]
-    """High-water mark of the buffer where frames are received. It defaults to 16 frames. The low-water mark defaults to max_queue // 4. You may pass a (high, low) tuple to set the high-water and low-water marks. If you want to disable flow control entirely, you may set it to None, although that’s a bad idea."""
+    """For synchronous connections, this requires websockets >=14. High-water mark of the buffer where frames are received. It defaults to 16 frames. The low-water mark defaults to max_queue // 4. You may pass a (high, low) tuple to set the high-water and low-water marks. If you want to disable flow control entirely, you may set it to None, although that’s a bad idea."""
+
+
+class WebSocketConnectionOptions(SyncWebSocketConnectionOptions, total=False):
+    """Native options for asynchronous WebSocket connections.
+
+    See https://websockets.readthedocs.io/en/stable/reference/asyncio/client.html#websockets.asyncio.client.connect
+    """
 
     write_limit: int | tuple[int, int | None]
     """High-water mark of write buffer in bytes. It is passed to set_write_buffer_limits(). It defaults to 32 KiB. You may pass a (high, low) tuple to set the high-water and low-water marks."""
diff --git a/tests/test_websocket_connection_options.py b/tests/test_websocket_connection_options.py
index 122ee10078..468b797c8a 100644
--- a/tests/test_websocket_connection_options.py
+++ b/tests/test_websocket_connection_options.py
@@ -1,3 +1,7 @@
+# An invalid native-sync literal becoming accepted must fail the type check.
+# pyright: reportUnnecessaryTypeIgnoreComment=true
+from typing import TYPE_CHECKING
+
 from openai import types
 from openai.types import websocket_connection_options
 
@@ -18,3 +22,30 @@ def test_beta_realtime_import_still_works_with_old_alias() -> None:
 
     assert Realtime.__name__ == "Realtime"
     assert AsyncRealtime.__name__ == "AsyncRealtime"
+
+
+if TYPE_CHECKING:
+    from openai import AsyncOpenAI
+    from openai.types.websocket_connection_options import SyncWebSocketConnectionOptions
+
+    def native_options_contract(
+        client: AsyncOpenAI,
+    ) -> tuple[SyncWebSocketConnectionOptions, SyncWebSocketConnectionOptions]:
+        # All synchronous native options remain representable. max_queue requires
+        # websockets >=14 for a synchronous native connection.
+        valid_sync: SyncWebSocketConnectionOptions = {
+            "extensions": None,
+            "subprotocols": None,
+            "compression": None,
+            "max_size": None,
+            "max_queue": (8, 2),
+        }
+        invalid_sync: SyncWebSocketConnectionOptions = {"write_limit": 65536}  # pyright: ignore[reportAssignmentType]
+
+        # The existing names still support async write limits on all supported
+        # websocket versions, including through the generated public entrypoint.
+        original: types.WebSocketConnectionOptions = {"write_limit": 65536, "max_queue": 8}
+        legacy: types.WebsocketConnectionOptions = {"write_limit": (65536, 16384)}
+        client.realtime.connect(model="test", websocket_connection_options=original)
+        client.responses.connect(websocket_connection_options=legacy)
+        return valid_sync, invalid_sync