GPT4Free (g4f) is an open-source project with more than 66,000 stars on GitHub that aggregates access to many powerful language models behind one free, OpenAI-style interface.
GPT4Free collects and maintains provider integrations for a wide range of language models — recent line-ups advertised by the project include frontier-class models from the GPT, Claude, DeepSeek, Kimi and Gemini families — and exposes them through a unified client and API server. Developers can point OpenAI-compatible code at g4f and experiment with different models without juggling separate accounts and keys for each one. The project is essentially a large, community-maintained provider-aggregation effort, which makes it popular for prototyping, education and cost-free experimentation. It has trended on GitHub 75 times in the archive, remains under heavy development with pushes in October 2026, and is released under the GPL-3.0 license. Provider availability changes often as upstream services evolve, so results vary by model and over time.
The project also ships a graphical interface and an API server, so non-developers can chat with the aggregated models directly while developers integrate them into applications. Because it depends on third-party services, models appear and disappear over time; the maintainers update providers continuously, which is why the repository sees near-daily activity and such a large following.
GPT4Free is free and open source under the GPL-3.0 license. There is no paid tier from the project itself; availability of specific models depends on the third-party providers it connects to.
Developers, students and hobbyists who want to experiment with many frontier language models at zero cost, and who are comfortable with a community tool whose provider line-up changes frequently.