# Mistral Large 4, explained

> Mistral Large 4 (Le Chonk) is Mistral's 1-trillion-parameter open-weight model. Weights released October 29, 2026, three weeks after the October 6 preview. Built for coding agents and defensive cybersecurity. API pricing $0.70 per million input tokens, $0.07 cached, $2.10 output. GPU checker and cost calculator on the page. Full guide: https://lab.awaara.cn/mistral-large-4/

## Key facts

- Announced as a preview: October 6, 2026. Open weights released: October 29, 2026.
- Architecture: natively multimodal mixture of experts, about 1 trillion total parameters, 49 billion active per token (52 billion counting embeddings and output layers), 128 routed experts with 4 active per token plus 1 shared expert.
- Context: up to 1 million tokens. Languages: more than 160. Vision: Pixtral-style encoder.
- Serving: vLLM, SGLang, llama.cpp, Transformers. Checkpoints: FP8 and NVFP4, plus day-one GGUF builds. Weights: mistralai/Mistral-Large-4-1T-A52B on Hugging Face.
- Hardware, Mistral's guidance: NVFP4 runs on as few as four Nvidia B200 or B300 GPUs. FP8 needs roughly twice the memory.
- Reasoning modes: low, medium, high. High is the default.
- API pricing from October 29, 2026: $0.70 input, $0.07 cached input, $2.10 output per million tokens. Prior list price after the preview promotion: $1.36 and $4.18. EU endpoint on OpenRouter: $0.77 and $2.31.
- Benchmarks: Terminal-Bench 4.0 41% (preview 28.3%), FrontierCode 2.0 19.7%, Artificial Analysis Coding Agent Index 48%, Artificial Analysis Cyber Index 51%, CyberGym-E2E-AA 82%, Cybench 93% (Mistral-reported), FinWorkBench 73.3%, Artificial Analysis Intelligence Index v5 26 (highest among Western open-weight models, behind leading Chinese open-weight models).
- License: Mistral Ecosystem Open-Weight License, a modified MIT license. Free to use, modify, fine-tune, and commercialize, except that a business offering the model as a hosted service must obtain a separate commercial license from Mistral first.
- Not published at the time of writing: a full technical report for the final checkpoint, independent benchmark runs of the downloadable weights, and the full license text beyond the announcement summary (the repository license governs).
- Caution: Mistral's 96.6% average refusal rate on malicious cyber requests describes the released configuration; fine-tuning, prompts, and serving policy can change it. A specialized penetration-testing variant stays limited to vetted enterprise design partners.

## Optional

- Independent explainer, not affiliated with Mistral. Prices and availability change; check Mistral's announcement before buying or building a hosted product.