FastChat
Open platform for training, serving, and evaluating large language models
What is FastChat?
FastChat is a LLM Evaluation tool. Open platform for training, serving, and evaluating large language models. FastChat is free to use. It is available on macOS and Linux. It is aimed at developers and researchers.
An open platform for training, serving, and evaluating large language models. It supports running and fine-tuning models like LLaMA and Vicuna, and includes tools for deployment and evaluation.
Built for developers and researchers.
Features
Model Weights
Inference with Command Line Interface
Serving with Web GUI
Chatbot Arena
Enables side-by-side model comparison UI
OpenAI-Compatible RESTful APIs
Hugging Face Generation APIs
LangChain Integration
Use cases
- Train large language models
- Serve large language models
- Evaluate large language models
- Run and fine-tune LLaMA models
- Run and fine-tune Vicuna models
Popular use cases
Who it's for
Pros & cons
Pros
- Free plan available
Cons
No documented limitations yet.
Pricing
Free.
Developer & API
Open source· Apache-2.0· 39.6K stars· 4.8K forks
FAQ
What is FastChat?
FastChat is a LLM Evaluation tool. Open platform for training, serving, and evaluating large language models. An open platform for training, serving, and evaluating large language models. It supports running and fine-tuning models like LLaMA and Vicuna, and includes tools for deployment and evaluation.
Is FastChat free?
Yes, FastChat is free to use.
How much does FastChat cost?
FastChat is free to use.
What platforms does FastChat support?
FastChat is available on macOS and Linux.
Who should use FastChat?
FastChat is built for developers and researchers. Common uses: train large language models, serve large language models, evaluate large language models and run and fine-tune LLaMA models.
Is FastChat open source?
Yes, FastChat is open source under the Apache-2.0 license.
What are the best alternatives to FastChat?
Similar tools on AiByts include PromptLayer, Vicuna-13B, DeepSeek-R1, Oracle AI and GPT4All.
Details are compiled from FastChat's website and public sources, last verified Oct 3, 2026. Features and pricing change — confirm on the official site before you buy.
Try FastChat
Free
Tags
- Model Weights
- Inference
- Serving
- Chatbot Arena
- OpenAI APIs
- Hugging Face APIs
- LangChain Integration
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