Mistral's Small 4 consolidates reasoning, vision and coding into one model — at a fraction of the inference cost

Enterprises that have been juggling separate models for reasoning, multimodal tasks, and agentic coding may be able to simplify their stack: Mistral’s new Small 4 brings all three into a single open-source model, with adjustable reasoning levels under the hood.Small 4 enters a crowded field of small models — including Qwen and Claude Haiku — that are competing on inference cost and benchmark performance. Mistral’s pitch: shorter outputs that translate to lower latency and cheaper tokens.Mistral Small 4 updates Mistral Small 3.2, which came out in June 2025, and is available under an Apache 2.0 license. “With Small 4, users no longer need to choose between a fast instruct model, a powerful reasoning engine, or a multimodal assistant: one model now delivers all three, with configurable reasoning effort and best-in-class efficiency,” Mistral said in a blog post.The company said that despite its smaller size — Mistral Small 4 has 119 billion total parameters with only 6 billion active para