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Mistral AIMarch 16, 2026

Leanstral-2603

Open Source
AI Agents
Agentic AI
Coding
Software Engineering (SW)

Explore Leanstral-2603

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### TL;DR

Leanstral-2603 is an open-source code agent developed by Mistral AI, designed specifically for the Lean 4 proof assistant. It combines multimodal capabilities with an efficient architecture, offering a performant and cost-effective alternative to existing closed-source solutions.

Key Insights & Metrics

Pricing
Free
Cost structure
Version
1.0
Current release version
Hardware
CPU only
Compute requirements
Category
Open Source
Licensing model
Region
France
Primary region

Key Features

  • MoE: 128 experts, 4 active per token
  • Model Size: 119B parameters with 6.5B activated per token
  • Context Length: 256k tokens
  • Multimodal Input: Accepts text and image input, producing text output
  • Multilingual Support: English, French, Spanish, German, Italian, Portuguese, Dutch, Chinese, Japanese, Korean, and Arabic

𝕏 From the Author

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