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Introducing Mistral Small 4

sourceSimon Willison
calendar_todayMarch 17, 2026
schedule2 min read
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EXECUTIVE SUMMARY

Mistral Unveils Groundbreaking AI Model: Mistral Small 4

Summary

Mistral has launched the Mistral Small 4, a new AI model that combines the capabilities of its flagship models into a single versatile solution. This model features 119 billion parameters and is designed to enhance reasoning and multimodal tasks.

Key Points

  • Mistral Small 4 is a Mixture-of-Experts model with 119 billion parameters and 6 billion active.
  • It unifies features from Magistral (reasoning), Pixtral (multimodal), and Devstral (agentic coding).
  • The model supports two reasoning efforts: "none" and "high", with high providing verbosity similar to previous Magistral models.
  • The model size is 242GB and is available on Hugging Face.
  • Users can access it via the Mistral API with commands like `llm install llm-mistral`.
  • Mistral also introduced Leanstral, an open weight model tuned for the Lean 4 coding language.
  • The release highlights Mistral's focus on enhancing AI capabilities in coding and reasoning tasks.

Analysis

The introduction of Mistral Small 4 signifies a major advancement in AI model capabilities, particularly in reasoning and coding. By integrating multiple functionalities into one model, Mistral aims to streamline AI applications for developers and researchers, making it easier to implement complex tasks.

Conclusion

IT professionals should explore the capabilities of Mistral Small 4 for applications in coding and reasoning tasks. Additionally, keeping an eye on updates to the Mistral API will be crucial for leveraging its full potential.