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Chess Puzzles (task version 2.0)

Games · 2026-10-13

Epoch AI's Chess Puzzles reruns under task version 2.0.x, published October 13-14, 2026. Epoch replaced most models' 1.x runs with these and published no changelog; several scores moved sharply (e.g. Claude Opus 4.7 max from 7 to 41), so the protocol is treated as distinct from 1.x. It is its own capability family, separate from the 1.x family: 80 models have 2.0 results and only 7 also have 1.x results, so the two protocols enter the fit side by side rather than pooled.

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