Models New
Mistral releases the weights of Mistral Large 4, its 1-trillion-parameter 'Le Chonk' model, and pitches it at cyber defenders
Published:
Mistral on 29 October published the weights of an improved Mistral Large 4, nicknamed Le Chonk, which it first offered as a public preview earlier this month. Mistral describes it as a 1-trillion-parameter, natively multimodal model trained from scratch in its own European data centres. The weights are on Hugging Face, and the model is also offered through Mistral's API and OpenRouter.
Mistral says three more weeks of reinforcement learning made it the strongest open-weight coding model. It reports 48% on the Artificial Analysis Coding Agent Index, level with Zhipu's GLM-5.3 while using 47% fewer tokens per task, and 41% on Terminal-Bench 4.0. On security, it reports 51% on the Artificial Analysis Cyber Index and a 96.6% average refusal rate on malicious cyber prompts.
The licence is a modified MIT licence: use, fine-tuning and commercial use are free, but companies selling the model as a service need a separate licence. API pricing is $0.70 per million input tokens and $2.10 per million output tokens. Mistral also says enterprise partners such as Orange Cyberdefense get preview access to a specialised variant for penetration testing and red-teaming, under vetting and contracts.
Caveat. The benchmark figures and refusal rates are reported by Mistral. Mistral itself says it saw potential for uplift to conduct real attacks in preview traffic and is tightening its guardrails.
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