Leanstral 1.5

·2026.07.01 05:44

Key point

Mistral AI released Leanstral 1.5, a Lean 4 model optimized for automated theorem proving and autoformalization.

Mistral AI unveiled Leanstral 1.5, a new model optimized for Lean 4 formal proof engineering.

This model is specifically designed for automated theorem proving and autoformalization tasks.

Key specifications and features are as follows:

Parameter scale: 6.5B active parameters out of a total of 119B parameters
Supported features: Supports key features of the Mistral AI Studio API, including Chat Completions, Function Calling, Agents, Structured Outputs, OCR, and TTS

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