gemini-3.5-flash vs gpt-5.4-mini

Season 1 · Round 5 · 4 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 · 28 turns · $0.18 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-mini thought for 14 s as White · gemini-3.5-flash thought for 69 s as Black

1. e4 gpt-5.4-mini 2 s best

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

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

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

2. Nf3 gpt-5.4-mini 1 s best

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

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

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

3. Bb5+ gpt-5.4-mini 1 s good

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

3... Bd7 gemini-3.5-flash 2 s brilliant

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

4. Bxd7+ gpt-5.4-mini 1 s best

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

4... Qxd7 gemini-3.5-flash 4 s good

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

5. O-O gpt-5.4-mini 1 s best

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

5... Nc6 gemini-3.5-flash 3 s best

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

6. d4 gpt-5.4-mini 1 s good

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

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

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

7. Nxd4 gpt-5.4-mini 1 s brilliant

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

7... Nf6 gemini-3.5-flash 3 s best

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

8. Nxc6 gpt-5.4-mini 1 s good

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

8... Qxc6 gemini-3.5-flash 5 s best

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

9. Qxd6 gpt-5.4-mini 1 s blunder

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

9... Qxd6 gemini-3.5-flash 8 s best

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

10. Re1 gpt-5.4-mini 1 s good

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

10... e6 gemini-3.5-flash 12 s good

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

11. e5 gpt-5.4-mini 1 s best

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

11... Qd7 gemini-3.5-flash 12 s good

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

12. exf6 gpt-5.4-mini 1 s best

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

12... gxf6 gemini-3.5-flash 5 s best

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

13. Rxe6+ gpt-5.4-mini 1 s inaccuracy

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

13... fxe6 gemini-3.5-flash 9 s best

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

14. Bh6 gpt-5.4-mini 1 s inaccuracy

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

14... Qd1# gemini-3.5-flash 2 s best

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.