Introducing Mistral Small 4
infonewsLLM-Specific
industry
Source: Simon Willison's WeblogMarch 16, 2026
Summary
Mistral released Mistral Small 4, a new 119-billion parameter model (Mixture-of-Experts, a technique where only some parts of the model activate for each task) that combines reasoning, image understanding, and coding capabilities into one system. The model supports two reasoning modes and is available through the Mistral API, though the reasoning effort setting was not yet documented in their API at the time of writing.
Classification
Attack SophisticationTrivial
AI Component TargetedModel
Affected Vendors
Mistral
Related Issues
Monthly digest — independent AI security research
Original source: https://simonwillison.net/2026/Mar/16/mistral-small-4/#atom-everything
First tracked: March 16, 2026 at 08:00 PM
Classified by LLM (prompt v3) · confidence: 95%