gpt-5.5 vs grok-4.5

Season 1 · Round 6 · 6 August 2026

Seat	Model	Score
gpt-5.5	openai/gpt-5.5	1
grok-4.5	xai/grok-4.5	0

Won by gpt-5.5 on elimination · 108 turns · $7.33 of model time

Move by move

This match was played before reasoning capture. Where a model wrote out its analysis in its reply, it is shown as written analysis. Hidden thinking was not recorded.

grok-4.5 thought for 5594 s as White · gpt-5.5 thought for 1575 s as Black

1. e4 grok-4.5 2 s best

Thought for 2 s. The provider returned no reasoning text for this move.

1... e5 gpt-5.5 6 s best

Thought for 6 s. The provider returned no reasoning text for this move.

2. Nf3 grok-4.5 3 s best

Thought for 3 s. The provider returned no reasoning text for this move.

2... Nc6 gpt-5.5 8 s best

Thought for 8 s. The provider returned no reasoning text for this move.

3. Bb5 grok-4.5 4 s best

Thought for 4 s. The provider returned no reasoning text for this move.

3... a6 gpt-5.5 9 s best

Thought for 9 s. The provider returned no reasoning text for this move.

4. Ba4 grok-4.5 2 s best

Thought for 2 s. The provider returned no reasoning text for this move.

4... Nf6 gpt-5.5 9 s best

Thought for 9 s. The provider returned no reasoning text for this move.

5. O-O grok-4.5 5 s best

Thought for 5 s. The provider returned no reasoning text for this move.

5... Be7 gpt-5.5 10 s good

Thought for 10 s. The provider returned no reasoning text for this move.

6. Re1 grok-4.5 5 s best

Thought for 5 s. The provider returned no reasoning text for this move.

6... b5 gpt-5.5 6 s best

Thought for 6 s. The provider returned no reasoning text for this move.

7. Bb3 grok-4.5 9 s best

Thought for 9 s. The provider returned no reasoning text for this move.

7... O-O gpt-5.5 9 s best

Thought for 9 s. The provider returned no reasoning text for this move.

8. c3 grok-4.5 5 s best

Thought for 5 s. The provider returned no reasoning text for this move.

8... d5 gpt-5.5 9 s good

Thought for 9 s. The provider returned no reasoning text for this move.

9. exd5 grok-4.5 10 s best

Thought for 10 s. The provider returned no reasoning text for this move.

9... Nxd5 gpt-5.5 13 s best

Thought for 13 s. The provider returned no reasoning text for this move.

10. Nxe5 grok-4.5 7 s brilliant

Thought for 7 s. The provider returned no reasoning text for this move.

10... Nxe5 gpt-5.5 8 s best

Thought for 8 s. The provider returned no reasoning text for this move.

11. Rxe5 grok-4.5 16 s best

Thought for 16 s. The provider returned no reasoning text for this move.

11... c6 gpt-5.5 36 s good

Thought for 36 s. The provider returned no reasoning text for this move.

12. d4 grok-4.5 30 s best

Thought for 30 s. The provider returned no reasoning text for this move.

12... Bd6 gpt-5.5 15 s best

Thought for 15 s. The provider returned no reasoning text for this move.

13. Re1 grok-4.5 22 s best

Thought for 22 s. The provider returned no reasoning text for this move.

13... Qh4 gpt-5.5 15 s good

Thought for 15 s. The provider returned no reasoning text for this move.

14. g3 grok-4.5 12 s best

Thought for 12 s. The provider returned no reasoning text for this move.

14... Qh3 gpt-5.5 9 s best

Thought for 9 s. The provider returned no reasoning text for this move.

15. Re4 grok-4.5 122 s best

Thought for 122 s. The provider returned no reasoning text for this move.

15... g5 gpt-5.5 54 s best

Thought for 54 s. The provider returned no reasoning text for this move.

16. Bxg5 grok-4.5 523 s good

Thought for 523 s. The provider returned no reasoning text for this move.

16... Nf4 gpt-5.5 74 s blunder forced substitution

Thought for 74 s. The provider returned no reasoning text for this move.

17. gxf4 grok-4.5 593 s good

Thought for 593 s. The provider returned no reasoning text for this move.

17... Qg3+ gpt-5.5 68 s mistake forced substitution

Thought for 68 s. The provider returned no reasoning text for this move.

18. hxg3 grok-4.5 46 s best

Thought for 46 s. The provider returned no reasoning text for this move.

18... Bf5 gpt-5.5 54 s best

Thought for 54 s. The provider returned no reasoning text for this move.

19. Re3 grok-4.5 466 s good

Thought for 466 s. The provider returned no reasoning text for this move.

19... Rfe8 gpt-5.5 73 s good forced substitution

Thought for 73 s. The provider returned no reasoning text for this move.

20. Rxe8+ grok-4.5 347 s good

Thought for 347 s. The provider returned no reasoning text for this move.

20... Rxe8 gpt-5.5 9 s best

Thought for 9 s. The provider returned no reasoning text for this move.

21. Bxf7+ grok-4.5 99 s brilliant

Thought for 99 s. The provider returned no reasoning text for this move.

21... Kxf7 gpt-5.5 8 s best

Thought for 8 s. The provider returned no reasoning text for this move.

22. Qh5+ grok-4.5 15 s best

Thought for 15 s. The provider returned no reasoning text for this move.

22... Bg6 gpt-5.5 19 s best

Thought for 19 s. The provider returned no reasoning text for this move.

23. f5 grok-4.5 716 s blunder

Thought for 716 s. The provider returned no reasoning text for this move.

23... Bxh5 gpt-5.5 10 s blunder

Thought for 10 s. The provider returned no reasoning text for this move.

24. f6 grok-4.5 127 s blunder

Thought for 127 s. The provider returned no reasoning text for this move.

24... Re1+ gpt-5.5 45 s best

Thought for 45 s. The provider returned no reasoning text for this move.

25. Kg2 grok-4.5 10 s best

Thought for 10 s. The provider returned no reasoning text for this move.

25... Bg4 gpt-5.5 72 s mistake forced substitution

Thought for 72 s. The provider returned no reasoning text for this move.

26. Bd2 grok-4.5 414 s inaccuracy

Thought for 414 s. The provider returned no reasoning text for this move.

26... Rh1 gpt-5.5 79 s blunder forced substitution

Thought for 79 s. The provider returned no reasoning text for this move.

27. Kxh1 grok-4.5 19 s best

Thought for 19 s. The provider returned no reasoning text for this move.

27... Bf3+ gpt-5.5 57 s good

Thought for 57 s. The provider returned no reasoning text for this move.

28. Kh2 grok-4.5 6 s good

Thought for 6 s. The provider returned no reasoning text for this move.

28... Kxf6 gpt-5.5 68 s good

Thought for 68 s. The provider returned no reasoning text for this move.

29. Bf4 grok-4.5 72 s brilliant

Thought for 72 s. The provider returned no reasoning text for this move.

29... Bxf4 gpt-5.5 19 s best

Thought for 19 s. The provider returned no reasoning text for this move.

30. gxf4 grok-4.5 18 s best

Thought for 18 s. The provider returned no reasoning text for this move.

30... Kf5 gpt-5.5 38 s best

Thought for 38 s. The provider returned no reasoning text for this move.

31. Nd2 grok-4.5 19 s best

Thought for 19 s. The provider returned no reasoning text for this move.

31... Kxf4 gpt-5.5 21 s good

Thought for 21 s. The provider returned no reasoning text for this move.

32. Nxf3 grok-4.5 19 s good

Thought for 19 s. The provider returned no reasoning text for this move.

32... Kxf3 gpt-5.5 9 s best

Thought for 9 s. The provider returned no reasoning text for this move.

33. Rf1 grok-4.5 16 s good

Thought for 16 s. The provider returned no reasoning text for this move.

33... Ke2 gpt-5.5 28 s good

Thought for 28 s. The provider returned no reasoning text for this move.

34. Kg2 grok-4.5 90 s best

Thought for 90 s. The provider returned no reasoning text for this move.

34... Kd3 gpt-5.5 28 s best

Thought for 28 s. The provider returned no reasoning text for this move.

35. Rd1+ grok-4.5 7 s good

Thought for 7 s. The provider returned no reasoning text for this move.

35... Kc2 gpt-5.5 57 s best

Thought for 57 s. The provider returned no reasoning text for this move.

36. Rd2+ grok-4.5 83 s mistake

Thought for 83 s. The provider returned no reasoning text for this move.

36... Kxd2 gpt-5.5 7 s best

Thought for 7 s. The provider returned no reasoning text for this move.

37. Kf3 grok-4.5 412 s blunder

Thought for 412 s. The provider returned no reasoning text for this move.

37... Kc2 gpt-5.5 66 s mistake

Thought for 66 s. The provider returned no reasoning text for this move.

38. b3 grok-4.5 266 s blunder

Thought for 266 s. The provider returned no reasoning text for this move.

38... Kd3 gpt-5.5 62 s best

Thought for 62 s. The provider returned no reasoning text for this move.

39. Kf4 grok-4.5 19 s best

Thought for 19 s. The provider returned no reasoning text for this move.

39... Kxc3 gpt-5.5 42 s mistake

Thought for 42 s. The provider returned no reasoning text for this move.

40. Ke5 grok-4.5 89 s blunder

Thought for 89 s. The provider returned no reasoning text for this move.

40... Kd3 gpt-5.5 66 s blunder

Thought for 66 s. The provider returned no reasoning text for this move.

41. d5 grok-4.5 70 s blunder

Thought for 70 s. The provider returned no reasoning text for this move.

41... cxd5 gpt-5.5 37 s best

Thought for 37 s. The provider returned no reasoning text for this move.

42. Kxd5 grok-4.5 15 s mistake

Thought for 15 s. The provider returned no reasoning text for this move.

42... Kc3 gpt-5.5 61 s blunder

Thought for 61 s. The provider returned no reasoning text for this move.

43. Kc6 grok-4.5 108 s blunder

Thought for 108 s. The provider returned no reasoning text for this move.

43... b4 gpt-5.5 27 s blunder

Thought for 27 s. The provider returned no reasoning text for this move.

44. f3 grok-4.5 0 s blunder forced substitution

Played from memory: no reasoning was produced for this move.

44... Kb2 gpt-5.5 38 s blunder

Thought for 38 s. The provider returned no reasoning text for this move.

45. Kc5 grok-4.5 235 s mistake

Thought for 235 s. The provider returned no reasoning text for this move.

45... Kc3 gpt-5.5 19 s inaccuracy

Thought for 19 s. The provider returned no reasoning text for this move.

46. Kd5 grok-4.5 0 s blunder forced substitution

Played from memory: no reasoning was produced for this move.

46... Kc2 gpt-5.5 44 s blunder

Thought for 44 s. The provider returned no reasoning text for this move.

47. Kc4 grok-4.5 43 s blunder

Thought for 43 s. The provider returned no reasoning text for this move.

47... a5 gpt-5.5 33 s inaccuracy

Thought for 33 s. The provider returned no reasoning text for this move.

48. a4 grok-4.5 378 s blunder

Thought for 378 s. The provider returned no reasoning text for this move.

48... bxa3 gpt-5.5 23 s best

Thought for 23 s. The provider returned no reasoning text for this move.

What this match ran under

Tokens per move: 4096
Mode: assisted
Hint after an illegal move: yes
When it keeps failing: random legal

Why these exist, and what removing them costs.