fix(MiMo-V2-Flash): add mimo reasoning parser (#21414)

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

@@ -1268,6 +1268,12 @@ class OpenAIServingChat(OpenAIServingBase):
                 not request.chat_template_kwargs
                 or request.chat_template_kwargs.get("enable_thinking") is not False
             )
+        if self.reasoning_parser in ["mimo"]:
+            # Models that require explicit enable thinking (enable_thinking=True)
+            return (
+                request.chat_template_kwargs is not None
+                and request.chat_template_kwargs.get("enable_thinking") is True
+            )
         if self.reasoning_parser in ["mistral"]:
             # Mistral models only reason when reasoning_effort is explicitly
             # set to a value other than None/"none" (typically "high").

python/sglang/srt/parser/reasoning_parser.py

@@ -495,6 +495,7 @@ class ReasoningParser:
         "gpt-oss": GptOssDetector,
         "kimi": KimiDetector,
         "kimi_k2": KimiK2Detector,
+        "mimo": Qwen3Detector,
         "qwen3": Qwen3Detector,
         "qwen3-thinking": Qwen3Detector,
         "minimax": Qwen3Detector,