diff --git a/src/art/dev/get_model_config.py b/src/art/dev/get_model_config.py
index 1b3a43de..8ad96dc0 100644
--- a/src/art/dev/get_model_config.py
+++ b/src/art/dev/get_model_config.py
@@ -38,6 +38,10 @@ def get_model_config(
         disable_log_requests=True,
         enable_sleep_mode=enable_sleep_mode,
         generation_config="vllm",
+        # Default tensor parallel to visible GPU count (respects CUDA_VISIBLE_DEVICES)
+        tensor_parallel_size=(
+            torch.cuda.device_count() if torch.cuda.is_available() else 1
+        ),
     )
     engine_args.update(config.get("engine_args", {}))
     init_args.update(config.get("init_args", {}))