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gemini-3.5-flash vs gpt-5.5

Season 1 · Round 1 · 26 July 2026

Seat Model Score
gemini-3.5-flash gemini/gemini-3.5-flash 1
gpt-5.5 openai/gpt-5.5 0

Won by gemini-3.5-flash on elimination · 125 turns · $4.63 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.

gpt-5.5 thought for 1250 s as White · gemini-3.5-flash thought for 335 s as Black

1. e4 gpt-5.5 4 s best

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

1... c5 gemini-3.5-flash 1 s best

Thought for 1 s. The provider returned no reasoning text for this move.

2. Nf3 gpt-5.5 9 s best

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

2... d6 gemini-3.5-flash 2 s best

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

3. d4 gpt-5.5 4 s best

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

3... cxd4 gemini-3.5-flash 1 s best

Thought for 1 s. The provider returned no reasoning text for this move.

4. Nxd4 gpt-5.5 3 s best

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

4... Nf6 gemini-3.5-flash 2 s best

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

5. Nc3 gpt-5.5 4 s best

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

5... a6 gemini-3.5-flash 2 s best

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

6. Be3 gpt-5.5 3 s best

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

6... e5 gemini-3.5-flash 2 s best

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

7. Nb3 gpt-5.5 9 s best

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

7... Be6 gemini-3.5-flash 2 s best

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

8. f3 gpt-5.5 19 s best

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

8... Be7 gemini-3.5-flash 3 s best

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

9. Qd2 gpt-5.5 10 s best

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

9... Nbd7 gemini-3.5-flash 3 s best

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

10. O-O-O gpt-5.5 10 s good

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

10... O-O gemini-3.5-flash 5 s good

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

11. g4 gpt-5.5 10 s best

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

11... b5 gemini-3.5-flash 3 s best

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

12. g5 gpt-5.5 49 s best

Thought for 49 s. The provider returned no reasoning text for this move.

12... Nh5 gemini-3.5-flash 4 s best

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

13. Nd5 gpt-5.5 48 s brilliant

Thought for 48 s. The provider returned no reasoning text for this move.

13... Bxd5 gemini-3.5-flash 5 s best

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

14. exd5 gpt-5.5 52 s best

Thought for 52 s. The provider returned no reasoning text for this move.

14... Nf4 gemini-3.5-flash 12 s inaccuracy

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

15. Bxf4 gpt-5.5 71 s best

Thought for 71 s. The provider returned no reasoning text for this move.

15... exf4 gemini-3.5-flash 5 s best

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

16. Qxf4 gpt-5.5 27 s blunder

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

16... Bxg5 gemini-3.5-flash 6 s brilliant

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

17. Bd3 gpt-5.5 80 s inaccuracy forced substitution

Thought for 80 s. The provider returned no reasoning text for this move.

17... Bxf4+ gemini-3.5-flash 5 s best

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

18. Nd2 gpt-5.5 20 s good

Thought for 20 s. The provider returned no reasoning text for this move.

18... Ne5 gemini-3.5-flash 12 s best

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

19. Rhe1 gpt-5.5 39 s best

Thought for 39 s. The provider returned no reasoning text for this move.

19... Nxd3+ gemini-3.5-flash 5 s best

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

20. cxd3 gpt-5.5 10 s best

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

20... Rc8+ gemini-3.5-flash 5 s good

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

21. Kb1 gpt-5.5 2 s best

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

21... Bxd2 gemini-3.5-flash 9 s good

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

22. Rxd2 gpt-5.5 11 s best

Thought for 11 s. The provider returned no reasoning text for this move.

22... Qg5 gemini-3.5-flash 6 s best

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

23. Rc2 gpt-5.5 47 s good

Thought for 47 s. The provider returned no reasoning text for this move.

23... Rxc2 gemini-3.5-flash 5 s best

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

24. Kxc2 gpt-5.5 9 s best

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

24... Rc8+ gemini-3.5-flash 7 s best

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

25. Kd1 gpt-5.5 20 s good

Thought for 20 s. The provider returned no reasoning text for this move.

25... Rc1+ gemini-3.5-flash 9 s brilliant

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

26. Ke2 gpt-5.5 5 s best

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

26... Qg2+ gemini-3.5-flash 7 s best

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

27. Ke3 gpt-5.5 5 s best

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

27... Rxe1+ gemini-3.5-flash 6 s best

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

28. Kf4 gpt-5.5 11 s best

Thought for 11 s. The provider returned no reasoning text for this move.

28... Qg5+ gemini-3.5-flash 23 s inaccuracy
Written analysis

An elegant and forced checkmate sequence is available starting with the queen check.

1... Qg5+

If White plays 2. Kf5, then 2... Re5+ 3. Kf6 Qg6# is mate.
If White plays 2. Ke4, then 2... Qe7+ 3. Kd4 Qe5+ 4. Kc4 Qc5+ 5. Kb3 Qb4# is mate.

Let's play the first move.

29. Kxg5 gpt-5.5 4 s best

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

29... Re5+ gemini-3.5-flash 18 s best

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

30. Kf4 gpt-5.5 28 s best

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

30... Rxd5 gemini-3.5-flash 5 s good

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

31. Ke4 gpt-5.5 10 s good

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

31... Rh5 gemini-3.5-flash 8 s best

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

32. Kd4 gpt-5.5 55 s good

Thought for 55 s. The provider returned no reasoning text for this move.

32... Rxh2 gemini-3.5-flash 2 s best

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

33. Kd5 gpt-5.5 11 s best

Thought for 11 s. The provider returned no reasoning text for this move.

33... Rxb2 gemini-3.5-flash 4 s best

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

34. Kxd6 gpt-5.5 12 s best

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

34... Rxa2 gemini-3.5-flash 3 s best

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

35. Kc5 gpt-5.5 31 s best

Thought for 31 s. The provider returned no reasoning text for this move.

35... b4 gemini-3.5-flash 5 s good

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

36. Kxb4 gpt-5.5 11 s best

Thought for 11 s. The provider returned no reasoning text for this move.

36... Rf2 gemini-3.5-flash 4 s good

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

37. Ka5 gpt-5.5 19 s best

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

37... Rxf3 gemini-3.5-flash 3 s good

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

38. d4 gpt-5.5 57 s best

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

38... Rd3 gemini-3.5-flash 2 s best

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

39. Kxa6 gpt-5.5 28 s best

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

39... Rxd4 gemini-3.5-flash 2 s best

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

40. Kb5 gpt-5.5 7 s best

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

40... h5 gemini-3.5-flash 3 s best

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

41. Kc6 gpt-5.5 10 s best

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

41... h4 gemini-3.5-flash 2 s best

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

42. Kc7 gpt-5.5 10 s best

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

42... h3 gemini-3.5-flash 2 s good

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

43. Kc8 gpt-5.5 11 s best

Thought for 11 s. The provider returned no reasoning text for this move.

43... h2 gemini-3.5-flash 2 s best

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

44. Kc7 gpt-5.5 12 s best

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

44... h1=Q gemini-3.5-flash 2 s best

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

45. Kb8 gpt-5.5 12 s best

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

45... Rd8+ gemini-3.5-flash 16 s best

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

46. Kc7 gpt-5.5 22 s best

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

46... Qa8 gemini-3.5-flash 10 s best

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

47. Kb6 gpt-5.5 7 s best

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

47... Qb7+ gemini-3.5-flash 8 s inaccuracy

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

48. Kxb7 gpt-5.5 7 s best

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

48... Rd7+ gemini-3.5-flash 3 s best

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

49. Kc8 gpt-5.5 23 s good

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

49... Rd6 gemini-3.5-flash 5 s good

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

50. Kc7 gpt-5.5 23 s good

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

50... Re6 gemini-3.5-flash 5 s good

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

51. Kd7 gpt-5.5 12 s best

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

51... Kf8 gemini-3.5-flash 3 s best

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

52. Kd8 gpt-5.5 33 s best

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

52... Re1 gemini-3.5-flash 6 s good

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

53. Kc8 gpt-5.5 42 s best

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

53... Rd1 gemini-3.5-flash 4 s good

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

54. Kc7 gpt-5.5 13 s good

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

54... Ke7 gemini-3.5-flash 3 s good

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

55. Kc6 gpt-5.5 36 s good

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

55... Rd6+ gemini-3.5-flash 5 s brilliant

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

56. Kc7 gpt-5.5 22 s good

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

56... Ke6 gemini-3.5-flash 6 s best

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

57. Kb8 gpt-5.5 12 s best

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

57... Kd7 gemini-3.5-flash 6 s best

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

58. Kb7 gpt-5.5 63 s good

Thought for 63 s. The provider returned no reasoning text for this move.

58... Rc6 gemini-3.5-flash 14 s brilliant

Thought for 14 s. The provider returned no reasoning text for this move.

59. Ka8 gpt-5.5 12 s good

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

59... Rb6 gemini-3.5-flash 14 s good

Thought for 14 s. The provider returned no reasoning text for this move.

60. Ka7 gpt-5.5 3 s best

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

60... Kc7 gemini-3.5-flash 6 s best

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

61. Ka8 gpt-5.5 5 s best

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

61... Ra6# gemini-3.5-flash 3 s best

Thought for 3 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.