diff --git a/tests/test_responses_websocket.py b/tests/test_responses_websocket.py
new file mode 100644
index 0000000000..261138f186
--- /dev/null
+++ b/tests/test_responses_websocket.py
@@ -0,0 +1,48 @@
+from __future__ import annotations
+
+import json
+from typing import Any, cast
+
+from openai.resources.responses.responses import ResponsesConnection, AsyncResponsesConnection
+
+
+class FakeWebSocket:
+    def __init__(self) -> None:
+        self.sent: list[str] = []
+
+    def send(self, data: str) -> None:
+        self.sent.append(data)
+
+
+class AsyncFakeWebSocket:
+    def __init__(self) -> None:
+        self.sent: list[str] = []
+
+    async def send(self, data: str) -> None:
+        self.sent.append(data)
+
+
+def test_responses_websocket_create_preserves_decimal_temperature() -> None:
+    websocket = FakeWebSocket()
+    connection = ResponsesConnection(cast(Any, websocket))
+
+    connection.response.create(model="gpt-4.1-mini", input="hello", temperature=1.2)
+
+    assert len(websocket.sent) == 1
+    payload = json.loads(websocket.sent[0])
+    assert payload["type"] == "response.create"
+    assert payload["temperature"] == 1.2
+    assert isinstance(payload["temperature"], float)
+
+
+async def test_async_responses_websocket_create_preserves_decimal_temperature() -> None:
+    websocket = AsyncFakeWebSocket()
+    connection = AsyncResponsesConnection(cast(Any, websocket))
+
+    await connection.response.create(model="gpt-4.1-mini", input="hello", temperature=1.2)
+
+    assert len(websocket.sent) == 1
+    payload = json.loads(websocket.sent[0])
+    assert payload["type"] == "response.create"
+    assert payload["temperature"] == 1.2
+    assert isinstance(payload["temperature"], float)