Change default model to Qwen3-0.6B (#20335)

Signed-off-by: Tyler Michael Smith <tyler@neuralmagic.com>

vllm/config.py

@@ -226,7 +226,7 @@ ModelDType = Literal["auto", "half", "float16", "bfloat16", "float", "float32"]
 class ModelConfig:
     """Configuration for the model."""
 
-    model: str = "facebook/opt-125m"
+    model: str = "Qwen/Qwen3-0.6B"
     """Name or path of the Hugging Face model to use. It is also used as the
     content for `model_name` tag in metrics output when `served_model_name` is
     not specified."""