Mistral launches Large 4 'Le Chonk' public preview, open weights due Oct. 27

French AI company Mistral has launched a public preview of Mistral Large 4, a one-trillion-parameter multimodal model code-named “Le Chonk,” with a focus on coding, cybersecurity, finance, manufacturing and visual grounding.

The model, abbreviated ML4, has 49 billion active parameters and was trained from scratch over roughly two months on 4,000 Nvidia Grace Blackwell GPUs in Mistral's European data centers. Mistral said the model was trained across more than 160 languages, including every official language of the European Union.

Mistral plans to make ML4 available through its API and to publish the model weights on Oct. 27 after a roughly three-week testing period with developers, cybersecurity leaders and government authorities. The weights will be released under a custom Mistral license; the company has not disclosed API pricing.

Mistral co-founder and chief scientist Guillaume Lample said ML4 is at the frontier of open-weight models. The company also shared preliminary benchmark results, though independent verification is still pending.