Add Mistral Large 3 support. (#14213)

Co-authored-by: elvischenv <219235043+elvischenv@users.noreply.github.com>
Co-authored-by: Linda-Stadter <57756729+Linda-Stadter@users.noreply.github.com>

python/sglang/srt/server_args.py

@@ -944,7 +944,18 @@ class ServerArgs:
 
         hf_config = self.get_hf_config()
         model_arch = hf_config.architectures[0]
-        if model_arch in ["DeepseekV3ForCausalLM"]:
+
+        if model_arch in [
+            "MistralLarge3ForCausalLM",
+            "PixtralForConditionalGeneration",
+        ]:
+            self.dtype = "bfloat16"
+
+        if model_arch in [
+            "DeepseekV3ForCausalLM",
+            "MistralLarge3ForCausalLM",
+            "PixtralForConditionalGeneration",
+        ]:
             if is_deepseek_nsa(hf_config):
                 if (
                     self.attention_backend is None
@@ -1050,7 +1061,7 @@ class ServerArgs:
                     # Default DeepSeek V3/R1 native FP8 when not explicitly set,
                     # Because we need this condition for an assertion in
                     # flashinfer_trtllm MoE runner backend.
-                    if quant_method is None:
+                    if quant_method is None and model_arch == "DeepseekV3ForCausalLM":
                         self.quantization = "fp8"
                         logger.info(
                             "Quantization not specified, default to fp8 for DeepSeek on sm100"
@@ -1693,6 +1704,8 @@ class ServerArgs:
                 "Glm4MoeForCausalLM",
                 "BailingMoeForCausalLM",
                 "BailingMoeV2ForCausalLM",
+                "MistralLarge3ForCausalLM",
+                "PixtralForConditionalGeneration",
             ]:
                 if self.speculative_draft_model_path is None:
                     self.speculative_draft_model_path = self.model_path
@@ -1933,6 +1946,8 @@ class ServerArgs:
                         "DeepseekV2ForCausalLM",
                         "DeepseekV3ForCausalLM",
                         "DeepseekV32ForCausalLM",
+                        "MistralLarge3ForCausalLM",
+                        "PixtralForConditionalGeneration",
                     ]
                 except Exception:
                     pass
@@ -4526,6 +4541,8 @@ def auto_choose_speculative_params(self: ServerArgs):
         "GptOssForCausalLM",
         "BailingMoeForCausalLM",
         "BailingMoeV2ForCausalLM",
+        "MistralLarge3ForCausalLM",
+        "PixtralForConditionalGeneration",
     ]:
         # The default value for deepseek and gpt-oss
         return (3, 1, 4)