Chess Puzzles Leaderboard

Chess Puzzles (Epoch AI Chess Puzzles (ECI internal benchmark)): An Epoch AI internal benchmark of 100 programmatically generated chess positions (given as FEN); the model must output the single Stockfish-best move, scored as exact-match accuracy. Feeds quick Epoch Capabilities Index (ECI) estimates; the top frontier score was under 40% at its 2025-12 release.

GPT-6 Astra leads Chess Puzzles at 72.64. The full leaderboard above lists every recorded measurement, not just the headline number.

135 models have recorded scores on Chess Puzzles, spanning a score spread of 72.64.

tensor.news grades Chess Puzzles A for integrity (score 100/100), ranking #1 of 65 benchmarks we assess across discrimination, saturation, contamination resistance, harness comparability, and freshness.

No — Chess Puzzles still has headroom and continues to discriminate between models rather than bunching them at the ceiling.

Its test set is held-out, which lowers — but does not eliminate — the risk that training data leaked into the questions.

Scores are reported under a consistent harness, so comparisons on Chess Puzzles are reasonably apples-to-apples.

Every Chess Puzzles measurement is source-backed and tagged reproduced, self-reported, or unverified; the underlying record cites epoch.ai/benchmarks/chess-puzzles.