Are Mistral AI models open source?

Many Mistral models ship with open weights. Mistral Large 4 uses the Mistral Ecosystem Open-Weight license, a modified MIT license that requires a separate commercial license for businesses offering the model as a service.

What is Mistral AI's largest model?

Mistral Large 4, nicknamed Le Chonk, with about 1 trillion total parameters and 52 billion active parameters, according to Mistral.

Mistral AI news

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Mistral AI is a Paris-based AI company that builds large language models and releases many of them with open weights.

Two men in dark suits sit facing each other in armchairs and talk in an orange-walled room with framed portraits. — Mistral releases open weights for Mistral Large 4, a 1-trillion-parameter model aimed at cyber defense

Open Source AI30 Oct 2026, 21:15 UTC

Mistral AI released the weights of Mistral Large 4 on 29 October 2026: a 1T-parameter open model for coding and defensive security, priced at $0.70 per 1M input tokens.

Summary

Mistral AI released the open weights of Mistral Large 4, nicknamed Le Chonk, on 29 October 2026, three weeks after an API-only preview. The mixture-of-experts model has about 1 trillion total and 52 billion active parameters and a 1M-token context window. Mistral pitches it for coding and defensive cybersecurity, reports 51% on the Artificial Analysis Cyber Index, and lists API prices of $0.70 input and $2.10 output per 1M tokens.

About Mistral AI

Mistral AI is a Paris-based AI company that builds large language models and releases many of them with open weights. It sells API access through Mistral Studio, the Le Chat assistant and the Vibe coding agent. On 29 October 2026 it released the weights of Mistral Large 4, its 1-trillion-parameter flagship model.

Reviewed 30 Oct 2026

Facts at a glance

Type: AI model developer and API provider
Headquarters: Paris, France
Chief executive: Arthur Mensch
Latest funding: EUR 3 billion Series D at a post-money valuation of more than EUR 21 billion (company announcement) source
Flagship model: Mistral Large 4, 1T total and 52B active parameters, open weights released 29 October 2026 source
Training infrastructure: Mistral Large 4 trained on 3,800 NVIDIA Grace Blackwell GPUs in Mistral's own European data centers source

More about Mistral AI (show)

What Mistral AI sells

Mistral AI publishes model weights on Hugging Face and sells hosted access through the Mistral API and Mistral Studio, the Le Chat assistant, the Vibe coding agent and Mistral Forge, a service for training custom models on a customer's own data. It positions its products around sovereign AI: models that organizations can inspect, customize and run on their own infrastructure. The timeline below lists every story on this site that names Mistral AI.

Questions people ask

Are Mistral AI models open source?: Many Mistral models ship with open weights. Mistral Large 4 uses the Mistral Ecosystem Open-Weight license, a modified MIT license that requires a separate commercial license for businesses offering the model as a service.
What is Mistral AI's largest model?: Mistral Large 4, nicknamed Le Chonk, with about 1 trillion total parameters and 52 billion active parameters, according to Mistral.

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Every story about Mistral AI

Mistral releases open weights for Mistral Large 4, a 1-trillion-parameter model aimed at cyber defense