gemini-3.5-flash vs gpt-5.4-nano

Season 1 · Round 1 · 26 July 2026

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

Won by gemini-3.5-flash on elimination · 30 turns · $0.21 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 14 s as White · gemini-3.5-flash thought for 83 s as Black

1. Nf3 gpt-5.4-nano 1 s good

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

1... d5 gemini-3.5-flash 2 s best

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

2. Nc3 gpt-5.4-nano 1 s good

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

2... Nf6 gemini-3.5-flash 5 s best

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

3. Nxd5 gpt-5.4-nano 1 s blunder

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

3... Nxd5 gemini-3.5-flash 4 s inaccuracy

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

4. Nd4 gpt-5.4-nano 1 s mistake

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

4... e5 gemini-3.5-flash 3 s best

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

5. e4 gpt-5.4-nano 1 s good

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

5... exd4 gemini-3.5-flash 6 s best

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

6. Bb5+ gpt-5.4-nano 1 s best

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

6... c6 gemini-3.5-flash 8 s good

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

7. Bxc6+ gpt-5.4-nano 1 s good

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

7... Nxc6 gemini-3.5-flash 7 s best

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

8. O-O gpt-5.4-nano 1 s good

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

8... Nb6 gemini-3.5-flash 7 s best

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

9. e5 gpt-5.4-nano 1 s good

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

9... Nxe5 gemini-3.5-flash 14 s good

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

10. Qf3 gpt-5.4-nano 1 s inaccuracy

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

10... Nxf3+ gemini-3.5-flash 2 s best

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

11. gxf3 gpt-5.4-nano 1 s best

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

11... Qg5+ gemini-3.5-flash 6 s best

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

12. Kh1 gpt-5.4-nano 1 s best

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

12... Bh3 gemini-3.5-flash 6 s best

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

13. Re1+ gpt-5.4-nano 1 s good

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

13... Be7 gemini-3.5-flash 5 s brilliant

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

14. Rxe7+ gpt-5.4-nano 1 s good

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

14... Kxe7 gemini-3.5-flash 7 s best

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

15. Rb1 gpt-5.4-nano 1 s best

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

15... Qg2# gemini-3.5-flash 2 s brilliant

Thought for 2 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.