Mate in 1
Benchmark page
Claude Sonnet 4.6 scored 10.7% strict accuracy on ChessBench, solving 16 of 150 fixed Lichess tactics when the answer had to match the expected UCI move line exactly.
Strict accuracy
10.7%
Correct puzzles
16 / 150
Prompt tokens
140,080
Total cost
$8.94
Benchmark updated
Mar 25, 2026, 2:14 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 Sonnet 4.6chess benchmark" and "Claude Sonnet 4.6tactical reasoning results".
For the full dataset definition and scoring details, visit the ChessBench dataset and methodology page.
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