CHESS BENCHMARK · CHESS960

Claude Opus 5.5 vs Stockfish 1320

Chess960. Claude Opus 5.5 played Black against Stockfish 1320 (1,320). Result 0-1, adjudicated: decisive advantage, after 82 plies. All of Claude Opus 5.5's games.

RESULT0-1

ENDED BYadjudicated: decisive advantage

MODEL TIME8.0 min

COST$1.05 (API-equivalent)

TOKENS IN / OUT46,226 / 34,095

REQUESTS43

[Event "Model Cadence Bench"] [Site "https://modelcadence.com/bench/chess"] [Date "????.??.??"] [Round "?"] [White "Stockfish 1320"] [Black "Claude Opus 5.5"] [Result "0-1"] [FEN "rqbbkrnn/pppppppp/8/8/8/8/PPPPPPPP/RQBBKRNN w KQkq - 0 1"] [SetUp "1"] [Variant "Chess960"] 1. f4 d5 2. Nf3 Nf6 3. e3 Ng6 4. O-O O-O 5. d4 Ne4 6. Ng3 c5 7. a4 Bf5 8. Be2 e6 9. Qa2 Bb6 10. c4 Nxg3 11. hxg3 cxd4 12. b4 dxe3 13. cxd5 exd5 14. a5 Bc7 15. Bb2 Be6 16. Qa3 Re8 17. Qc3 f6 18. Rac1 Bd6 19. Bb5 Rc8 20. Qxe3 Bf7 21. Bc3 a6 22. Bd7 Rc7 23. Bg4 Qe8 24. Qd2 Qe4 25. Rfe1 Qc4 26. Bd4 Qb3 27. Rxc7 Bxc7 28. Rc1 Bd6 29. Bc5 Bxc5+ 30. Nd4 Bxd4+ 31. Kf1 Qe3 32. Qxe3 Bxe3 33. Rc7 Rb8 34. Bd7 Nf8 35. Bc8 Ne6 36. Rc3 Bd4 37. Bxe6 Bxc3 38. f5 Bxe6 39. g4 Bf7 40. g5 Bxb4 41. gxf6 gxf6 0-1