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Leanstral 1.5 is a what..?

This story is from 2026-09-08. It is preserved in the archive; the latest stories are on the live feed.

I was doing the do out on the internet, and you do, and came across Mistral AI Leanstral 1.5 . Which calls itself: An updated Lean 4 formal proof engineering model optimised for automated theorem proving and autoformalization. 119B total parameters, 6.5B active. I was like, wow, thats a thingymabob…

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  1. 2026-09-08 17:13 · DEV Community — AI
    Leanstral 1.5 is a what..?

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