GPT4All is a free, open-source desktop application from Nomic AI that lets anyone run large language models locally on their own computer — no account, no API key and no internet connection required. It is one of the most starred local-LLM projects on GitHub, with more than 77,000 stars, and it remains actively maintained, with its latest updates in 2025.
GPT4All downloads open-weight models — including models from the Llama, Mistral and Qwen families — and runs them efficiently on ordinary CPUs and consumer GPUs. A friendly chat interface hides the complexity: pick a model, download it and start chatting, with everything processed on-device so conversations stay private. For developers, GPT4All also ships Python bindings and a local server mode, making it a simple way to embed offline inference in scripts and applications. Inside the app, a built-in catalog presents each model with its size, hardware requirements and license, and chats can be organized, searched and exported, and settings expose the knobs — temperature, context length, repeat penalties — when you want them. The software is released under the MIT license and is available for commercial use.
GPT4All is completely free and open source under the MIT license. There is no paid tier for the application itself; you only supply the computer it runs on.
GPT4All is for privacy-conscious users, developers prototyping LLM features, and anyone who wants a ChatGPT-style assistant that works offline — on a plane, in a secure facility, or simply without sending data to the cloud.