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Mistral Large 4 preview activates 49B of its 1T parameters

simonwillison.net Editor score 7/10

Mistral's preview model has 1 trillion parameters, 49 billion active parameters and was trained on 3,800 Grace Blackwell GPUs; it scores 38 on Artificial Analysis in the excerpt. The scale and benchmark offer useful context for evaluating a new frontier-model release.

What

Mistral Large 4 is a preview model with 1 trillion parameters and 49 billion active parameters, trained on 3,800 NVIDIA Grace Blackwell GPUs.

How

The preview is available through Mistral’s API and supports two reasoning levels, “none” and “high”; open weights are promised later in the month.

Why it matters

The distinction between total and active parameters is useful context for engineers evaluating large-model designs and API previews.

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