Mate in 1
Benchmark page
Claude Opus 4.7 scored 18.7% strict accuracy on ChessBench, solving 28 of 150 fixed Lichess tactics when the answer had to match the expected UCI move line exactly.
Strict accuracy
18.7%
Correct puzzles
28 / 150
Prompt tokens
178,339
Total cost
$4.43
Benchmark updated
Apr 17, 2026, 2:29 AM
Find the tactical line that creates a fork.
Find the line that wins an undefended piece.
Solve a forced mate in one move.
Solve a forced mate in two moves.
Find the tactical line that exploits a pin.
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It also links back to the benchmark methodology and exposes model-specific copy, numbers, and sample puzzle outcomes that are relevant to searches like "Claude Opus 4.7chess benchmark" and "Claude Opus 4.7tactical reasoning results".
For the full dataset definition and scoring details, visit the ChessBench dataset and methodology page.
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