Mert Ünsal(@mertunsal2020):let's go leanstral! much shorter proofs than aristotle. It's the most important thing to make the right bets and it's very easy to work hard on useless things. We made the bet that the way to go for formal theorem proving is pure code agent setup: no custom provers, no lean servers. Lean is a programming language and it's meant to be interacted that way!

Mert Ünsal@mertunsal2020

2026.08.18 23:23

let's go leanstral! much shorter proofs than aristotle. It's the most important thing to make the right bets and it's very easy to work hard on useless things. We made the bet that the way to go for formal theorem proving is pure code agent setup: no custom provers, no lean servers. Lean is a programming language and it's meant to be interacted that way!

Albert Jiang@AlbertQJiang

2026.08.18 23:00

Great to see @WendaLi8 talk about Leanstral in the ICML tutorial: Starting 2:09:00 you see Leanstral present an elegant 6-line proof using grind compared to Claude's 40-50 line slop and Aristotle's 180-line MCTS trace (alledgedly) :P Leanstral: Claude: Aristotle: Genuinely gobsmacked by the Aristotle proof taking three vertical screenshots to capture and the last one exceeds twitter photo limit lol