head to head · open source
GPT4All vs faiss
GPT4All has 77,347 GitHub stars, 8,261 forks, 771 open issues and last shipped 1.4 years ago. faiss has 41,251 stars, 4,584 forks, 327 open issues and last shipped 2 days ago. GPT4All leads on adoption by 88% (77,347 vs 41,251 stars). GPT4All is written in C++ under MIT; faiss is written in C++ under MIT. GPT4All has attracted 11% as many forks as stars, faiss 11%. faiss was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| GPT4All | faiss | |
|---|---|---|
| GitHub stars | ★ 77K | ★ 41K |
| License | MIT | MIT |
| Written in | C++ | C++ |
| Last push | 2025-05-27 | 2026-11-01 |
| Forks | ⑂ 8.3K | ⑂ 4.6K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick GPT4All if
- You weight community size — 77K stars and counting
- You want the MIT license terms
- Your stack matches C++
- You value the larger contributor base for long-term maintenance
pick faiss if
- You want the faiss feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches C++
- You evaluated both and faiss fits your workflow better
About GPT4All
GPT4All Now with support for DeepSeek R1 Distillations Website • Documentation • Discord • YouTube Tutorial GPT4All runs large language models (LLMs) privately on everyday desktops & laptops. No API calls or GPUs required you can just download the application and get started . Read about what's new in our blog . Subscribe to the newsletter GPT4All is made possible by our compute partner Paperspace . Download Links — Windows Installer — — Windows ARM Installer — — macOS Installer — — Ubuntu Installer — The Windows and Linux builds require Intel Core…
read the full GPT4All overview →
About faiss
Faiss Faiss is a library for efficient similarity search and clustering of dense vectors. It contains algorithms that search in sets of vectors of any size, up to ones that possibly do not fit in RAM. It also contains supporting code for evaluation and parameter tuning. Faiss is written in C++ with complete wrappers for Python/numpy. Some of the most useful algorithms are implemented on the GPU. It is developed primarily at Meta's Fundamental AI Research group. News See CHANGELOG.md for detailed information about latest features. Introduction Faiss contains several methods for similarity search. It assumes that…
read the full faiss overview →
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Frequently asked questions
Is GPT4All or faiss more popular?
GPT4All has 77,347 GitHub stars and faiss has 41,251. GPT4All has the larger community by that measure.
Are GPT4All and faiss free?
Both are open source. GPT4All is licensed under MIT and faiss under MIT. Neither carries a licence fee.
What is the difference between GPT4All and faiss?
GPT4All is written in C++ and faiss in C++. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, GPT4All or faiss?
Choose GPT4All if you want the larger community (77,347 stars) or its MIT licence terms. Choose faiss if its feature set, stack or MIT licence fits better. Both are self-hostable.