# Mistral launches public preview of Mistral Large 4 model

> Mistral offers a 1‑trillion‑parameter multimodal model for a preview API, with full weights due later in October.

Oossa · 2026-10-06 · https://oossa.com/en/mistral-launches-public-preview-of-mistral-large-4-model

Mistral announced today that a public preview of its new model, Mistral Large 4 (ML4), is available through the Mistral Studio API. The preview can be tried immediately, and the company plans to release the model weights by the end of the month. ML4 is a 1 trillion‑parameter model that uses 49 billion active parameters and is designed to handle text, code, and images.

## How we got here

ML4 was trained from scratch on 3,800 NVIDIA Grace Blackwell GPUs in Mistral’s European datacenters. The training data includes more than 160 languages, covering every official EU language. Mistral says the model already matches the strongest open‑source models on many benchmarks and beats other open‑weight models from the US and Europe, especially in cybersecurity, finance, and legal tasks.

## What happens next

The company will continue red‑team testing with cybersecurity partners and state authorities before the final weights are released. After the weight release, customers will be able to run ML4 on private cloud or on‑premise installations, including a dedicated European deployment that operates under EU law. Mistral also plans to build specialized versions of ML4 for industry‑specific workloads, funded by its recent €3 billion Series D round.

## The facts

- The public preview of Mistral Large 4 went live on 2026-10-06.
- ML4 is a 1 trillion‑parameter model with 49 billion active parameters.
- Training used 3,800 NVIDIA Grace Blackwell GPUs in European datacenters.
- The model was evaluated on the Artificial Analysis Cyber Index, scoring 82% on a vulnerability‑patch test, the highest among open‑weight models.
- ML4 achieved 93% success on the Cybench security competition set.
- Weights are scheduled to be released by the end of October 2026.

## Why it matters

For enterprises, especially in security and finance, ML4 offers a powerful AI that can be run on their own infrastructure, avoiding reliance on third‑party providers that might block critical tasks. The open‑weight release means organizations can audit and customize the model to meet regulatory or privacy requirements. However, the full capabilities and performance outside the preview remain unverified until the final weights are released.

## Sources & references

1. [Introducing Mistral Large 4](https://mistral.ai/news/mistral-large-4/) – Mistral, 2026-10-06
2. [Mistral has released Mistral Large 4, making France home to the most intelligent model outside the US and China](https://artificialanalysis.ai/articles/mistral-large-4-france-ai) – Artificial Analysis, 2026-10-06
3. [New on OpenRouter: Mistral: Mistral Large 4](https://openrouter.ai/mistralai/mistral-large-4-0) – OpenRouter API, 2026-10-06
4. [Mistral launches open-source Mistral Large 4, details AI roadmap](https://siliconangle.com/2026/10/06/mistral-launches-open-source-mistral-large-4-details-ai-roadmap/) – SiliconANGLE, 2026-10-06
5. [Introducing Mistral Large 4: Le chonk](https://simonwillison.net/2026/Oct/6/le-chonk/) – Simon Willison, 2026-10-06
6. [Mistral’s new 1T model aims to leapfrog closed and open rivals](https://techcrunch.com/2026/10/06/mistrals-new-1t-model-aims-to-leapfrog-closed-and-open-rivals/) – TechCrunch, 2026-10-06
7. [Mistral Large 4 is Europe's trillion-parameter answer to US models that refuse security work](https://the-decoder.com/mistral-large-4-is-said-to-be-the-most-powerful-open-ai-model-from-europe-and-the-u-s/) – The Decoder, 2026-10-06
8. [Mistral unveils new AI model it says rivals best open systems from China](https://www.cnbc.com/2026/10/06/mistral-ai-model-le-chonk.html) – CNBC, 2026-10-06
9. [Mistral AI Releases Mistral Large 4 (Le Chonk): A 1.05T Parameter Multimodal MoE Model](https://www.marktechpost.com/2026/10/06/mistral-ai-releases-mistral-large-4-le-chonk-a-1-05t-parameter-open-weight-multimodal-moe/) – MarkTechPost, 2026-10-06
10. [Mistral Says Its New AI Model ‘Le Chonk’ Is the Best Open-Weight Offering Outside of China](https://www.wired.com/story/mistral-new-model-le-chonk-open-source-china-us-frontier/) – Wired, 2026-10-06

Last updated: 2026-10-06