Mistral AI releases Leanstral 1.5 for formal verification
Mistral AI has launched Leanstral 1.5, an open AI model under the Apache 2.0 licence. The model focuses on advanced theorem verification and automated code auditing.

Vad har hänt
Mistral AI has made Leanstral 1.5 public as an open-source model under the Apache 2.0 licence. This version of the AI model is designed for advanced, formal verification of mathematical proofs and software correctness. The model is built with a Mixture-of-Experts architecture and has 119 billion total parameters, of which 6 billion are active during inference.
Key facts
| Modell | Leanstral 1.5 |
|---|---|
| Licens | Apache 2.0 |
| Parametrar (totalt) | 119 miljarder |
| Parametrar (aktiva) | 6 miljarder |
| Benchmarkresultat | 100% på miniF2F |
”Mistral has open-sourced Leanstral 1.5 under the Apache 2.0 licence, bringing advanced AI-powered theorem proving and automated code verification to developers and enterprises with self-hosting support.”
”Mistral AI has released Leanstral 1.5 as an open-source AI model under the Apache 2.0 licence, expanding access to advanced formal verification for mathematical proofs and software correctness.”
Varför det spelar roll
By making Leanstral 1.5 open source with a permissive licence, Mistral AI enables commercial use, modification, and self-hosting. This is particularly significant for organisations with strict compliance and data governance requirements. The model works in conjunction with the interactive theorem prover Lean 4.
Vem påverkas
Developers and companies working with academic mathematics and software verification are directly affected, as they gain access to a powerful tool for self-hosting. Mistral AI is a French AI company positioning itself as a leading player in open and responsible AI development.
EU-status
Not relevant for EU status.
Mer att veta
Leanstral 1.5 is available via a free API endpoint and for self-hosting via Hugging Face. The model achieved 100% on both validation and test sets in the miniF2F benchmark, according to Mistral AI.
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