In a post on X, @MistralAI says Mistral Large 4, also called “Le Chonk,” is a natively multimodal model with 1 trillion total parameters and 49 billion active parameters. The company says the model is available through its API today, while an open-weights release is planned for the end of October.

What Mistral Large 4 is

The model’s 1-trillion-parameter figure refers to its total parameter count, while the 49-billion figure refers to the parameters active for a given computation, according to Mistral’s announcement. Mistral also describes Large 4 as natively multimodal, meaning it is designed to work with more than one type of input or output, such as text and visual information.

For its benchmark comparison, Mistral calls Large 4 “the best open weights model from US or Europe on aggregated benchmarks.” The announcement does not identify those benchmarks or explain how the comparison was conducted. It also describes the open-weights release as a future plan rather than reporting that the model weights are already available.

Video: Announcement video accompanying Mistral’s post about the Large 4 model and reported specifications

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Reported capabilities and workloads

Mistral says Large 4 reaches state-of-the-art performance on critical workloads including cyber defense, manufacturing and finance. These are reported workload-level statements; the announcement does not include scores, test datasets, evaluation procedures or independent results to substantiate them.

The company also says Large 4 surpasses closed frontier models on visual grounding, a capability involving the connection of visual content with the relevant words, objects or locations in an input. Mistral does not name the competing models or provide details of the comparison.

European development and deployment

Mistral says Large 4 was “forged in Europe end-to-end” and can be deployed from Europe through its own Mistral Cloud infrastructure. The announcement does not specify the available regions, deployment configuration, data-handling terms or compliance options.

How to access Mistral Large 4

Mistral says Large 4 is available to everyone through its API today. The announcement does not include an API URL, pricing, rate limits, supported inputs or documentation details, so it establishes the reported availability but not the practical terms of using the service.

The company separately says it is working privately with cybersecurity partners. That statement describes ongoing partner work, not a public cybersecurity deployment or a generally available product built for that use case.

When will the open weights be released?

Mistral says the open-weights release is planned for the end of October. The post does not give an exact calendar date or year, and it does not specify the license, downloadable files, self-hosting requirements or hardware needed to run the model.

For now, the announcement distinguishes between two access routes: API access is reported as available today, while the open-weights release remains a future plan with important release details still unspecified.

Sources