CHESS BENCHMARK · CHESS960

Claude Opus 5.5 vs Stockfish 1500

Chess960. Claude Opus 5.5 played Black against Stockfish 1500 (1,500). Result 1-0, adjudicated: decisive advantage, after 116 plies. All of Claude Opus 5.5's games.

RESULT1-0

ENDED BYadjudicated: decisive advantage

MODEL TIME15.4 min

COST$1.80 (API-equivalent)

TOKENS IN / OUT75,302 / 59,816

REQUESTS64

[Event "Model Cadence Bench"] [Site "https://modelcadence.com/bench/chess"] [Date "????.??.??"] [Round "?"] [White "Stockfish 1500"] [Black "Claude Opus 5.5"] [Result "1-0"] [FEN "rbnkqrbn/pppppppp/8/8/8/8/PPPPPPPP/RBNKQRBN w KQkq - 0 1"] [SetUp "1"] [Variant "Chess960"] 1. a4 d5 2. f4 Ng6 3. f5 Ne5 4. e4 dxe4 5. Ng3 Nd6 6. d4 Nec4 7. Nb3 Qc6 8. Qe2 Nxb2+ 9. Kc1 Nbc4 10. c3 Nb6 11. Nxe4 Nxe4 12. Qxe4 Qxe4 13. Bxe4 c6 14. a5 Nc4 15. Nc5 Nd6 16. Bd3 Bc7 17. Kc2 e5 18. f6 gxf6 19. a6 bxa6 20. Nxa6 Bb6 21. Rxf6 Ke7 22. Rf3 e4 23. Re3 f5 24. Be2 f4 25. Rh3 Rf7 26. c4 Nf5 27. c5 Ba5 28. Rxa5 Rg7 29. Rh5 Rxg2 30. Rxf5 Rxe2+ 31. Kc3 Rg2 32. Re5+ Kd7 33. Rxe4 Rxg1 34. Rxf4 Be6 35. Nb4 Rg2 36. Rf6 Rxh2 37. d5 Bxd5 38. Nxd5 cxd5 39. Kd4 Rd2+ 40. Ke5 d4 41. Rh6 d3 42. Ke4 Re8+ 43. Kf3 Re7 44. Rxh7 Rxh7 45. Rxa7+ Kc6 46. Rxh7 Kxc5 47. Ke4 Kc4 48. Rc7+ Kb3 49. Ra7 Kc3 50. Rc7+ Kb2 51. Rd7 Kc2 52. Rc7+ Kd1 53. Rf7 Ke1 54. Ke3 Rd1 55. Ra7 d2 56. Rh7 Kf1 57. Rh1+ Kg2 58. Rxd1 Kg3 1-0