Invigil, the benchmark a lab cannot train against

Field notes

The proposed evaluation separates a reproducible public method from a private problem set that is never published and is refreshed quarterly from later research literature. Models receive theorem statements and return proof bodies; Invigil’s harness supplies the statement and Lean 4 checks correctness and axiom dependencies. Runs are described as pre-registered and hash-committed, with certification by Antefacts, a commonly owned entity whose relationship the site says is disclosed on its certification page.