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FastChat
Python

FastChat

An open platform for training, serving, and evaluating large language models. Release repo for Vicuna and Chatbot Arena.

by lm-sys · GitHub
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In plain words

Train and evaluate chatbots using a platform that supports multiple large language models.

From the README

Install
git clone https://github.com/lm-sys/FastChat.git
cd FastChat

Excerpts from the project README on GitHub. Copyright and licensing remain with the respective authors.

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2026-07-122026-08-31
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📄 About

An open platform for training, serving, and evaluating large language models. Release repo for Vicuna and Chatbot Arena.

FastChat has 39.5k stars on GitHub. It has been forked 4.8k times. FastChat is written mainly in Python. It has been in active development since 2023. FastChat is available under the Apache-2.0 license.

Frequently asked questions

What is FastChat?

An open platform for training, serving, and evaluating large language models. Release repo for Vicuna and Chatbot Arena.

Is FastChat open source?

FastChat is an open-source project. It is released under the Apache-2.0 license.

Is FastChat free?

Yes. FastChat is free and open source — you can use, modify and self-host it.

What license does FastChat use?

FastChat is available under the Apache-2.0 license.

What language is FastChat written in?

FastChat is written mainly in Python.

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