Models · Mistral AI News · Update

Leanstral 1.5: Proof Abundance for All

Leanstral 1.5, a free Apache-2.0 licensed model with 6B active parameters, delivers a major performance upgrade in formal verification, saturating miniF2F, solving 587/672 PutnamBench problems, and achieving state-of-the-art results on FATE-H (87%) and FATE-X.

Why it matters

This matters to teams comparing model capability, API access, or migration timing. Check the source for availability and evaluation conditions.

What changed

The technical change sits in models. Check what is available now, how it was evaluated, and where the source's claim stops.

What to watch

The main uncertainty is scope: vendor claims still need workload, pricing, availability, and independent context.