gemini-3.5-flash vs gpt-5.4-mini

Season 1 · Round 6 · 6 August 2026

Seat	Model	Score
gemini-3.5-flash	gemini/gemini-3.5-flash	1
gpt-5.4-mini	openai/gpt-5.4-mini	0

Won by gemini-3.5-flash on elimination · 65 turns · $0.65 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.

gemini-3.5-flash thought for 261 s as White · gpt-5.4-mini thought for 36 s as Black

1. e4 gemini-3.5-flash 1 s best

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

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

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

2. e5 gemini-3.5-flash 2 s best

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

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

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

3. exf6 gemini-3.5-flash 3 s best

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

3... gxf6 gpt-5.4-mini 1 s best

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

4. d4 gemini-3.5-flash 3 s best

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

4... e5 gpt-5.4-mini 2 s best

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

5. Nc3 gemini-3.5-flash 7 s best

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

5... e4 gpt-5.4-mini 1 s inaccuracy

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

6. Bf4 gemini-3.5-flash 8 s best

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

6... e3 gpt-5.4-mini 1 s inaccuracy

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

7. fxe3 gemini-3.5-flash 6 s good

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

7... Bd6 gpt-5.4-mini 2 s good

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

8. Qf3 gemini-3.5-flash 7 s good

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

8... Bxf4 gpt-5.4-mini 1 s best

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

9. Qxf4 gemini-3.5-flash 7 s best

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

9... O-O gpt-5.4-mini 1 s good

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

10. Bd3 gemini-3.5-flash 8 s best

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

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

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

11. Nxh3 gemini-3.5-flash 15 s good

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

11... Re8 gpt-5.4-mini 1 s best

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

12. Qh6 gemini-3.5-flash 13 s best

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

12... Rxe3+ gpt-5.4-mini 1 s good

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

13. Qxe3 gemini-3.5-flash 4 s best

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

13... Qe7 gpt-5.4-mini 1 s good

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

14. Qxe7 gemini-3.5-flash 3 s best

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

14... Nc6 gpt-5.4-mini 1 s best

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

15. Qxf6 gemini-3.5-flash 7 s best

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

15... Nxd4 gpt-5.4-mini 1 s good

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

16. Bxh7+ gemini-3.5-flash 4 s brilliant

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

16... Kf8 gpt-5.4-mini 2 s best

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

17. Qh8+ gemini-3.5-flash 7 s good

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

17... Ke7 gpt-5.4-mini 1 s best

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

18. Qxa8 gemini-3.5-flash 5 s best

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

18... Nf3+ gpt-5.4-mini 2 s good

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

19. gxf3 gemini-3.5-flash 3 s best

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

19... Kf6 gpt-5.4-mini 1 s good

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

20. Qd8+ gemini-3.5-flash 8 s best

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

20... Ke5 gpt-5.4-mini 1 s best

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

21. Qxd5+ gemini-3.5-flash 15 s brilliant

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

21... Kf6 gpt-5.4-mini 1 s best

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

22. Qg5+ gemini-3.5-flash 5 s brilliant

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

22... Ke6 gpt-5.4-mini 1 s best

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

23. Bf5+ gemini-3.5-flash 15 s brilliant

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

23... Ke5 gpt-5.4-mini 1 s best

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

24. Be6+ gemini-3.5-flash 19 s brilliant

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

24... Kxe6 gpt-5.4-mini 1 s best

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

25. Nf4+ gemini-3.5-flash 12 s best

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

25... Kd6 gpt-5.4-mini 1 s best

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

26. Qd5+ gemini-3.5-flash 10 s brilliant

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

26... Ke7 gpt-5.4-mini 1 s best

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

27. Qd7+ gemini-3.5-flash 15 s brilliant

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

27... Kxd7 gpt-5.4-mini 1 s good

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

28. O-O-O+ gemini-3.5-flash 2 s best

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

28... Ke7 gpt-5.4-mini 1 s best

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

29. Rhe1+ gemini-3.5-flash 16 s best

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

29... Kf6 gpt-5.4-mini 1 s best

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

30. Ncd5+ gemini-3.5-flash 11 s good

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

30... Kg5 gpt-5.4-mini 1 s best

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

31. h4+ gemini-3.5-flash 10 s good

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

31... Kf5 gpt-5.4-mini 1 s best

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

32. Ne7+ gemini-3.5-flash 6 s good

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

32... Kf6 gpt-5.4-mini 1 s good

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

33. Nh5# gemini-3.5-flash 5 s best

Thought for 5 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.