Add deepseek v3.1 thinking parser support and update docs (#9464)

Signed-off-by: Xinyuan Tong <xinyuantong.cs@gmail.com>

python/sglang/srt/entrypoints/openai/serving_chat.py

@@ -872,12 +872,15 @@ class OpenAIServingChat(OpenAIServingBase):
         Returns:
             The boolean value of 'enable_thinking' if found, otherwise False.
         """
-        if (
-            hasattr(request, "chat_template_kwargs")
-            and request.chat_template_kwargs
-            and request.chat_template_kwargs.get("enable_thinking") is not None
-        ):
-            return request.chat_template_kwargs.get("enable_thinking")
+        if hasattr(request, "chat_template_kwargs") and request.chat_template_kwargs:
+            # For Qwen3 models, `enable_thinking` is supported.
+            if request.chat_template_kwargs.get("enable_thinking") is not None:
+                return request.chat_template_kwargs.get("enable_thinking")
+            # For DeepSeek-V3.1 models, `thinking` is supported.
+            elif request.chat_template_kwargs.get("thinking") is not None:
+                return request.chat_template_kwargs.get("thinking")
+            else:
+                return False
         return False
 
     async def _process_tool_call_stream(

python/sglang/srt/reasoning_parser.py

@@ -513,12 +513,13 @@ class ReasoningParser:
 
     DetectorMap: Dict[str, Type[BaseReasoningFormatDetector]] = {
         "deepseek-r1": DeepSeekR1Detector,
+        "deepseek-v3": Qwen3Detector,
+        "glm45": Qwen3Detector,
+        "gpt-oss": GptOssDetector,
+        "kimi": KimiDetector,
         "qwen3": Qwen3Detector,
         "qwen3-thinking": Qwen3Detector,
-        "glm45": Qwen3Detector,
-        "kimi": KimiDetector,
         "step3": DeepSeekR1Detector,
-        "gpt-oss": GptOssDetector,
     }
 
     def __init__(