feat: Add 'none' reasoning effort to ChatCompletionRequest (#20556)

test/registered/openai_server/basic/test_protocol.py

@@ -192,6 +192,30 @@ class TestChatCompletionRequest(unittest.TestCase):
         self.assertEqual(request.reasoning_effort, "high")
         self.assertEqual(request.chat_template_kwargs, {"thinking": True})
 
+    def test_chat_completion_reasoning_effort_none(self):
+        """Test reasoning_effort='none' disables thinking"""
+        messages = [{"role": "user", "content": "Hello"}]
+        request = ChatCompletionRequest(
+            model="test-model",
+            messages=messages,
+            reasoning_effort="none",
+        )
+        self.assertEqual(request.reasoning_effort, "none")
+        self.assertFalse(request.chat_template_kwargs.get("thinking"))
+        self.assertFalse(request.chat_template_kwargs.get("enable_thinking"))
+
+    def test_chat_completion_reasoning_effort_none_from_reasoning_dict(self):
+        """Test reasoning_effort='none' via nested reasoning dict"""
+        messages = [{"role": "user", "content": "Hello"}]
+        request = ChatCompletionRequest(
+            model="test-model",
+            messages=messages,
+            reasoning={"effort": "none"},
+        )
+        self.assertEqual(request.reasoning_effort, "none")
+        self.assertFalse(request.chat_template_kwargs.get("thinking"))
+        self.assertFalse(request.chat_template_kwargs.get("enable_thinking"))
+
     def test_chat_completion_json_format(self):
         """Test chat completion json format"""
         transcript = "Good morning! It's 7:00 AM, and I'm just waking up. Today is going to be a busy day, "