# vLLM Integration You can use [vLLM](https://vllm.ai/) as an optimized worker implementation in FastChat. It offers advanced continuous batching and a much higher (~10x) throughput. See the supported models [here](https://vllm.readthedocs.io/en/latest/models/supported_models.html). ## Instructions 1. Install vLLM. ``` pip install vllm ``` 2. When you launch a model worker, replace the normal worker (`fastchat.serve.model_worker`) with the vLLM worker (`fastchat.serve.vllm_worker`). All other commands such as controller, gradio web server, and OpenAI API server are kept the same. ``` python3 -m fastchat.serve.vllm_worker --model-path lmsys/vicuna-7b-v1.3 ```