Key takeaways
- Mistral Large 4 is open-weight: the weights are public on Hugging Face, but Mistral does not say the training data or code is.
- The license is a modified MIT license that allows commercial use.
- Businesses that sell the model as a hosted service need a separate commercial license.
Mistral Large 4 is open-weight, not fully open source. Mistral published the model's weights on Hugging Face on October 29 under a modified MIT license, so you can download, modify, fine-tune and use it commercially, with one exception: companies that sell it as a hosted service need a separate commercial license, according to Mistral's announcement.
What "open-weight" means here
Open-weight means the trained model file is public. It does not mean the training data or the full training code is public, and Mistral's post does not say they are. The weights are in the Mistral-Large-4-1T-A52B repository, which Hugging Face lists as not gated, with the license tagged "other".
What the license allows
Mistral calls it the Mistral Ecosystem Open-Weight license and describes it as a modified MIT license.
| Use | Allowed? |
|---|---|
| Download and run it yourself | Yes |
| Modify and fine-tune it | Yes |
| Use it inside a commercial product | Yes |
| Sell access to it as a hosted service (Model-as-a-Service) | Only with a separate commercial license from Mistral |
Read the full license text in the repository before building a business on it. This page summarizes Mistral's description, not the legal terms.
Is Mistral Large 4 free?
The weights are free to download. Running a 1-trillion-parameter model takes serious hardware. Mistral lists vLLM and SGLang for self-hosting. If you would rather use Mistral's API, it costs $0.70 per million input tokens, $0.07 per million cached input tokens and $2.10 per million output tokens, as of October 29, 2026. The model is also available through OpenRouter, NVIDIA-hosted endpoints and Microsoft Foundry.
How it compares
For benchmarks and prices next to a closed model, see our Mistral Large 4 vs Opus 5.5 comparison. For the release itself, see our news report.
What you can and cannot check
Mistral describes the license in its post, and Hugging Face tags it "other". That is why the repository's own license file matters more than any summary. Mistral also says it is changing the model's guardrails because it sees "a potential for uplift to conduct real attacks", and it keeps a cyber-focused variant limited to vetted enterprise partners. The public weights are not that variant.
Open source, open weight and the difference in practice
Under the common definition, open source means you can see how a model was made, not only run it. A downloadable file gives you the second but not the first. For most developers the day-to-day difference is small: you can host the model on your own servers, keep your data in your own systems and tune it for your work. The difference shows up in audits and research, where missing training data limits what anyone outside Mistral can check.
Frequently asked questions
Is Mistral Large 4 free?
The weights are free to download. Mistral's API costs $0.70 per million input tokens and $2.10 per million output tokens as of October 29, 2026.
Can I use Mistral Large 4 commercially?
Yes, Mistral says the license allows commercial use. Companies that run it as a Model-as-a-Service offering need a separate commercial license.
Where can I download Mistral Large 4?
The weights are in the mistralai/Mistral-Large-4-1T-A52B repository on Hugging Face.
Sources
- Le Chonk: Built for Coders, Trusted by DefendersMistral AI
- Mistral-Large-4-1T-A52BHugging Face
