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lm-sys/FastChat

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

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What it does

FastChat is an open-source platform that lets you train, deploy, and benchmark AI chatbots, and it's the engine behind Chatbot Arena — a site where over 10 million conversations have been used to rank 70+ AI models head-to-head. It also released Vicuna, one of the early open-source AI assistants that demonstrated performance rivaling commercial models like ChatGPT.

Why it matters

For builders considering which AI model to use or whether to build their own, FastChat provides both the infrastructure to deploy models and real-world performance data from 1.5 million human preference votes — reducing the guesswork in picking the right AI backbone for a product. The OpenAI-compatible API layer also means teams can swap in open-source models without rewriting their existing integrations, lowering costs and reducing dependency on closed providers.

10Active

On the radar — signal detected

Stars
39.5k
Forks
4.8k
Contributors
246
Language
Python

Score updated Jun 27, 2026

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