Is Mistral Large 4 open source?

The weights are published on Hugging Face under the Mistral Ecosystem Open-Weight license, a modified MIT license. Use, modification and commercial use are allowed, but businesses offering the model as a service need a separate commercial license from Mistral.

How much does Mistral Large 4 cost in the API?

Mistral lists $0.70 per 1M input tokens, $0.07 per 1M cached input tokens and $2.10 per 1M output tokens.

How large is Mistral Large 4?

About 1 trillion total parameters, with 49 billion active per token or 52 billion including embeddings and output layers, according to the model card.

Mistral Large 4 news

Open-weight multimodal language model1 story

Mistral Large 4, nicknamed Le Chonk, is a mixture-of-experts model from Mistral AI with about 1 trillion total and 52 billion active parameters and a 1M-token context window.

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 Large 4

Mistral Large 4, nicknamed Le Chonk, is a mixture-of-experts model from Mistral AI with about 1 trillion total and 52 billion active parameters and a 1M-token context window. It entered public preview on 6 October 2026 and its open weights were released on 29 October 2026, with coding and defensive cybersecurity as its main targets.

Reviewed 30 Oct 2026 · by Mistral AI

Facts at a glance

Developer: Mistral AI
Public preview: 6 October 2026 (API only) source
Open weights released: 29 October 2026 source
Parameters: About 1T total; 49B active per token, 52B including embeddings and output layers (128 routed experts, 4 active, plus 1 shared expert) source
Context window: 1M tokens source
Modalities: Text and image input, text output
Reasoning modes: Low, medium and high (default) source
API price: $0.70 per 1M input tokens, $0.07 per 1M cached input tokens, $2.10 per 1M output tokens source
License: Mistral Ecosystem Open-Weight license (modified MIT; Model-as-a-Service businesses need a separate commercial license) source
Weights: FP8 and NVFP4 checkpoints on Hugging Face source
Training hardware: 3,800 NVIDIA Grace Blackwell GPUs in Mistral's own European data centers source

More about Mistral Large 4 (show)

What Mistral Large 4 is used for

Mistral positions Mistral Large 4 for agentic coding, defensive cybersecurity, multimodal document and image work, and enterprise tasks in finance, law and science. The weights run in vLLM, SGLang, Hugging Face Transformers and llama.cpp, and the model is also served through the Mistral API, Mistral Studio, OpenRouter, Microsoft Foundry and NVIDIA-hosted endpoints. Mistral says it will serve as the base for a new generation of specialized Mistral models.

Questions people ask

Is Mistral Large 4 open source?: The weights are published on Hugging Face under the Mistral Ecosystem Open-Weight license, a modified MIT license. Use, modification and commercial use are allowed, but businesses offering the model as a service need a separate commercial license from Mistral.
How much does Mistral Large 4 cost in the API?: Mistral lists $0.70 per 1M input tokens, $0.07 per 1M cached input tokens and $2.10 per 1M output tokens.
How large is Mistral Large 4?: About 1 trillion total parameters, with 49 billion active per token or 52 billion including embeddings and output layers, according to the model card.

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