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gpt-5.4-mini vs gpt-5.4-nano

Season 1 · Round 6 · 6 August 2026

Seat Model Score
gpt-5.4-mini openai/gpt-5.4-mini
gpt-5.4-nano openai/gpt-5.4-nano

Drawn on turn_cap · 200 turns · $0.17 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-5.4-nano thought for 110 s as White · gpt-5.4-mini thought for 95 s as Black

1. Nf3 gpt-5.4-nano 1 s good

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

1... Nf6 gpt-5.4-mini 2 s good

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

2. Nc3 gpt-5.4-nano 1 s inaccuracy

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

2... d5 gpt-5.4-mini 1 s best

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

3. Nxd5 gpt-5.4-nano 1 s blunder

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

3... Nxd5 gpt-5.4-mini 1 s inaccuracy

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

4. Nd4 gpt-5.4-nano 1 s mistake

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

4... Nc6 gpt-5.4-mini 2 s inaccuracy

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

5. Nxc6 gpt-5.4-nano 1 s best

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

5... bxc6 gpt-5.4-mini 2 s best

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

6. c4 gpt-5.4-nano 1 s best

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

6... Nf6 gpt-5.4-mini 1 s best

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

7. c5 gpt-5.4-nano 1 s inaccuracy

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

7... Qxd2+ gpt-5.4-mini 1 s blunder

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

8. Kxd2 gpt-5.4-nano 1 s good

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

8... Ne4+ gpt-5.4-mini 1 s good

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

9. Kd3 gpt-5.4-nano 1 s blunder

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

9... Nxc5+ gpt-5.4-mini 1 s blunder

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

10. Ke3 gpt-5.4-nano 1 s best

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

10... Ne4 gpt-5.4-mini 1 s good

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

11. Kxe4 gpt-5.4-nano 1 s best

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

11... Bh3 gpt-5.4-mini 1 s inaccuracy

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

12. Bh6 gpt-5.4-nano 1 s inaccuracy

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

12... gxh6 gpt-5.4-mini 2 s good

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

13. Qd7+ gpt-5.4-nano 1 s blunder

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

13... Kxd7 gpt-5.4-mini 1 s blunder

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

14. Kd4 gpt-5.4-nano 1 s blunder

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

14... c5+ gpt-5.4-mini 1 s good

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

15. Kxc5 gpt-5.4-nano 1 s good

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

15... e5+ gpt-5.4-mini 1 s best

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

16. Kb5 gpt-5.4-nano 2 s good

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

16... Ba3 gpt-5.4-mini 1 s blunder

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

17. Rd1+ gpt-5.4-nano 1 s mistake

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

17... Ke8 gpt-5.4-mini 1 s mistake

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

18. Rd8+ gpt-5.4-nano 1 s blunder

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

18... Kxd8 gpt-5.4-mini 1 s good

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

19. Ka5 gpt-5.4-nano 1 s good

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

19... Kc8 gpt-5.4-mini 1 s good

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

20. Ka6 gpt-5.4-nano 1 s good

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

20... Bxb2 gpt-5.4-mini 1 s good

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

21. Ka5 gpt-5.4-nano 1 s good

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

21... Rd8 gpt-5.4-mini 1 s inaccuracy

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

22. Ka6 gpt-5.4-nano 1 s inaccuracy

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

22... Rd6+ gpt-5.4-mini 1 s best

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

23. Kb5 gpt-5.4-nano 5 s best

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

23... Rd5+ gpt-5.4-mini 1 s best

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

24. Ka6 gpt-5.4-nano 1 s best

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

24... Ra5+ gpt-5.4-mini 1 s mistake

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

25. Kxa5 gpt-5.4-nano 1 s best

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

25... Bxg2 gpt-5.4-mini 1 s blunder

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

26. Bxg2 gpt-5.4-nano 1 s best

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

26... Bd4 gpt-5.4-mini 1 s blunder

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

27. Bxa8 gpt-5.4-nano 1 s best

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

27... Bb6+ gpt-5.4-mini 1 s best

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

28. Ka4 gpt-5.4-nano 1 s best

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

28... Ba5 gpt-5.4-mini 1 s good

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

29. Kxa5 gpt-5.4-nano 1 s best

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

29... Kb8 gpt-5.4-mini 1 s inaccuracy

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

30. Ka6 gpt-5.4-nano 1 s inaccuracy

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

30... Kxa8 gpt-5.4-mini 1 s inaccuracy

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

31. Ka5 gpt-5.4-nano 1 s mistake

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

31... Kb7 gpt-5.4-mini 1 s good

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

32. Ka4 gpt-5.4-nano 1 s good

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

32... c5 gpt-5.4-mini 1 s good

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

33. Ka5 gpt-5.4-nano 1 s good

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

33... c4 gpt-5.4-mini 1 s best

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

34. Kb5 gpt-5.4-nano 5 s best

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

34... a6+ gpt-5.4-mini 1 s best

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

35. Kxc4 gpt-5.4-nano 1 s good

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

35... f5 gpt-5.4-mini 2 s good

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

36. Kc5 gpt-5.4-nano 1 s best

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

36... Ka7 gpt-5.4-mini 1 s good

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

37. Rc1 gpt-5.4-nano 1 s best

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

37... e4 gpt-5.4-mini 1 s best

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

38. Rd1 gpt-5.4-nano 1 s good

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

38... f4 gpt-5.4-mini 1 s good

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

39. Rd6 gpt-5.4-nano 1 s good

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

39... Ka8 gpt-5.4-mini 1 s inaccuracy

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

40. Rxh6 gpt-5.4-nano 1 s inaccuracy

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

40... Kb7 gpt-5.4-mini 1 s good

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

41. Rxh7+ gpt-5.4-nano 5 s best

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

41... Ka8 gpt-5.4-mini 1 s inaccuracy

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

42. Rh8+ gpt-5.4-nano 1 s inaccuracy

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

42... Kb7 gpt-5.4-mini 1 s best

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

43. Rh7+ gpt-5.4-nano 5 s best

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

43... Ka8 gpt-5.4-mini 1 s good

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

44. Rh8+ gpt-5.4-nano 1 s good

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

44... Ka7 gpt-5.4-mini 1 s inaccuracy

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

45. Rh7+ gpt-5.4-nano 1 s best

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

45... Kb8 gpt-5.4-mini 2 s best

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

46. Rb7+ gpt-5.4-nano 1 s mistake

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

46... Kc8 gpt-5.4-mini 1 s good

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

47. Kb4 gpt-5.4-nano 1 s inaccuracy

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

47... Kxb7 gpt-5.4-mini 1 s best

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

48. Kc5 gpt-5.4-nano 1 s best

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

48... Ka7 gpt-5.4-mini 1 s good

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

49. Kb4 gpt-5.4-nano 1 s good

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

49... e3 gpt-5.4-mini 1 s best

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

50. fxe3 gpt-5.4-nano 1 s best

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

50... f3 gpt-5.4-mini 1 s good

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

51. exf3 gpt-5.4-nano 1 s best

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

51... a5+ gpt-5.4-mini 1 s best

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

52. Kxa5 gpt-5.4-nano 1 s good

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

52... Kb8 gpt-5.4-mini 1 s best

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

53. Kb6 gpt-5.4-nano 1 s inaccuracy

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

53... Ka8 gpt-5.4-mini 1 s inaccuracy

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

54. Kc6 gpt-5.4-nano 1 s inaccuracy

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

54... Ka7 gpt-5.4-mini 1 s good

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

55. Kd7 gpt-5.4-nano 1 s good

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

55... Ka6 gpt-5.4-mini 1 s best

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

56. Kc6 gpt-5.4-nano 1 s best

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

56... Ka5 gpt-5.4-mini 1 s best

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

57. Kc5 gpt-5.4-nano 1 s best

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

57... Ka4 gpt-5.4-mini 1 s best

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

58. Kd6 gpt-5.4-nano 1 s good

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

58... Ka5 gpt-5.4-mini 1 s best

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

59. Kd7 gpt-5.4-nano 1 s best

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

59... Kb6 gpt-5.4-mini 1 s best

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

60. Kc8 gpt-5.4-nano 1 s inaccuracy

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

60... Ka5 gpt-5.4-mini 1 s inaccuracy

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

61. Kd7 gpt-5.4-nano 1 s best

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

61... Kb6 gpt-5.4-mini 1 s good

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

62. Kc8 gpt-5.4-nano 1 s inaccuracy

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

62... Ka5 gpt-5.4-mini 1 s inaccuracy

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

63. Kb7 gpt-5.4-nano 1 s inaccuracy

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

63... Ka4 gpt-5.4-mini 1 s good

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

64. Ka7 gpt-5.4-nano 5 s inaccuracy

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

64... Ka5 gpt-5.4-mini 1 s good

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

65. h4 gpt-5.4-nano 1 s best

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

65... Kb4 gpt-5.4-mini 1 s best

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

66. h5 gpt-5.4-nano 1 s best

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

66... Ka3 gpt-5.4-mini 1 s good

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

67. h6 gpt-5.4-nano 1 s best

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

67... Kxa2 gpt-5.4-mini 1 s best

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

68. h7 gpt-5.4-nano 1 s best

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

68... Kb2 gpt-5.4-mini 1 s best

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

69. h8=Q+ gpt-5.4-nano 1 s best

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

69... Kc2 gpt-5.4-mini 1 s good

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

70. Qd8 gpt-5.4-nano 1 s good

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

70... Kb2 gpt-5.4-mini 1 s good

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

71. Qd1 gpt-5.4-nano 1 s best

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

71... Ka3 gpt-5.4-mini 1 s best

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

72. Qd7 gpt-5.4-nano 1 s best

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

72... Kb4 gpt-5.4-mini 1 s best

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

73. Qd8 gpt-5.4-nano 1 s best

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

73... Kc3 gpt-5.4-mini 1 s best

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

74. Qd2+ gpt-5.4-nano 1 s brilliant

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

74... Kxd2 gpt-5.4-mini 1 s best

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

75. e4 gpt-5.4-nano 1 s best

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

75... Ke3 gpt-5.4-mini 1 s best

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

76. e5 gpt-5.4-nano 5 s best

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

76... Kxf3 gpt-5.4-mini 1 s best

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

77. e6 gpt-5.4-nano 1 s best

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

77... Kg2 gpt-5.4-mini 5 s good

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

78. e7 gpt-5.4-nano 1 s best

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

78... Kf1 gpt-5.4-mini 1 s best

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

79. e8=Q gpt-5.4-nano 1 s best

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

79... Kg2 gpt-5.4-mini 1 s good

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

80. Qh5 gpt-5.4-nano 1 s good

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

80... Kg3 gpt-5.4-mini 1 s good

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

81. Qh8 gpt-5.4-nano 1 s good

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

81... Kg4 gpt-5.4-mini 1 s best

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

82. Qg8+ gpt-5.4-nano 1 s good

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

82... Kh5 gpt-5.4-mini 1 s good

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

83. Qg7 gpt-5.4-nano 1 s best

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

83... Kh4 gpt-5.4-mini 1 s best

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

84. Qg8 gpt-5.4-nano 1 s best

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

84... Kh5 gpt-5.4-mini 1 s best

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

85. Qh8+ gpt-5.4-nano 1 s good

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

85... Kg4 gpt-5.4-mini 1 s best

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

86. Qh7 gpt-5.4-nano 1 s good

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

86... Kf4 gpt-5.4-mini 1 s best

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

87. Qd3 gpt-5.4-nano 1 s best

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

87... Ke5 gpt-5.4-mini 4 s best

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

88. Qh7 gpt-5.4-nano 1 s best

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

88... Kd5 gpt-5.4-mini 1 s good

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

89. Qh4 gpt-5.4-nano 1 s good forced substitution

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

89... Kc5 gpt-5.4-mini 1 s good

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

90. Qh8 gpt-5.4-nano 1 s good

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

90... Kb4 gpt-5.4-mini 1 s good

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

91. Qh7 gpt-5.4-nano 1 s good

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

91... Ka4 gpt-5.4-mini 1 s best

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

92. Qh8 gpt-5.4-nano 1 s best

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

92... Kb4 gpt-5.4-mini 1 s best

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

93. Qh6 gpt-5.4-nano 1 s best

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

93... Kc5 gpt-5.4-mini 1 s best

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

94. Qh7 gpt-5.4-nano 1 s good

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

94... Kd6 gpt-5.4-mini 1 s good

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

95. Qh8 gpt-5.4-nano 1 s good

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

95... Kd5 gpt-5.4-mini 1 s best

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

96. Qa8+ gpt-5.4-nano 1 s good

Played from memory: no reasoning was produced 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.