lm-sys/FastChat
An open platform for training, serving, and evaluating large language models. Release repo for Vicuna and Chatbot Arena.
FastChat is an open source Python project by lm-sys, created in March 2023. It has 39,548 stars and 4,779 forks on GitHub and is released under the Apache-2.0 license. Its most recent commit was on May 1, 2026, and it has 903 open issues, 30 of them labelled “good first issue”, which makes it a friendly place to start contributing. On FindOpenSource.dev it is listed under LLMs.
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