GPT 5.6 Sol Successfully Formalizes Complex Math Proof for Nonsofic Existence
Sauers_ · x · 2026-08-05
A user demonstrated that GPT 5.6 Sol successfully formalized the Kun and Kun-Thom work (with necessary repairs) to prove nonsofic existence. Notably, the model did not formalize the entire work but only what was necessary for the specific goal. This was achieved without access to OpenAI's internal Lean code, running as a single instance on 'high' effort over a couple of days.
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