{"article":{"slug":"mistral-large-4-open-weights","kind":"model","source":{"title":"Mistral Large 4 (Le Chonk) is now open weight","url":"https://mistral.ai/news/mistral-large-4-oss","date":"2026-10-29"},"headline":"Mistral releases Large 4 weights under a modified MIT license, with a catch for resellers","whatChanged":"Mistral AI released the weights of Mistral Large 4 on October 29. It is a 1-trillion-parameter, natively multimodal model that Mistral first put out in public preview earlier in the month. The license is the Mistral Ecosystem Open-Weight license, a modified MIT license: free to use, modify, fine-tune and commercialize, except that a business operating a Model-as-a-Service offering needs a separate commercial license from Mistral. Weights are on Hugging Face for vLLM or SGLang. The hosted API costs $0.70 per million input tokens, $0.07 cached and $2.10 output, with Low, Medium and High reasoning modes.\n\nMistral reports 19.7% on Cognition's private FrontierCode 2.0, the highest score on its chart. On the Artificial Analysis Coding Agent Index it scores 48%, which Mistral calls effectively tied with GLM-5.3, while using 47% fewer tokens per task. On Terminal-Bench 4.0 it reaches 41%, up 13 points from the preview. In Surge Code's blind comparisons, graders preferred it to GLM-5.3, Kimi K3 and DeepSeek V4.1 Flash, and Mistral says only Claude Opus 5.5 ranked ahead of it among the models evaluated. Mistral says it refuses 96.6% of malicious cyber requests on average. A technical report is not yet published.","whyItMatters":"Open weights and a $0.70 and $2.10 hosted price put a strong coding model within reach of teams that want to run it themselves. On list price alone that is below GPT-6.1 Terra's $1 and $5 and Carbon's $2 and $10, though the models were tested differently and the scores cannot be lined up.\n\nRead the license first. It is free for most uses, but anyone operating a Model-as-a-Service offering needs a separate commercial license. The strongest claim, \"best open-weight model for coding,\" is Mistral's own, backed by benchmarks the company selected.","issuer":"Mistral AI","glance":"Mistral released Large 4 open weights October 29 under a modified MIT license; its API costs $0.70 in and $2.10 out.","keyFact":"Open weights; API $0.70 in, $2.10 out","action":"Read Mistral's license terms before building a hosted product on the Large 4 weights.","guide":{"slug":"where-your-ai-should-run","title":"Where should our AI run? Choosing for each piece of work"},"evidenceNote":"Mistral's announcement charts render in the page with download buttons, and no stable image URL could be verified for hotlinking. Figures used here come from the page text, not from reading the chart images, and the chart label-to-score pairing was not checked.","companyLabel":"Public edition"},"issue":{"id":"2026-11-02","publishedLabel":"Week of November 2, 2026","isLatest":false},"position":{"index":3,"total":4},"next":{"slug":"new-york-ai-companion-chatbot-law","headline":"New York's chatbot law starts January 1 and allows fines up to $25,000 per violation"},"session":null}