gemini-3.1-flash-lite vs gemini-3.1-pro-preview

Season 1 · Round 2 · 31 July 2026

Seat	Model	Score
gemini-3.1-flash-lite	gemini/gemini-3.1-flash-lite	0
gemini-3.1-pro-preview	gemini/gemini-3.1-pro-preview	1

Won by gemini-3.1-pro-preview on elimination · 42 turns · $0.63 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.

gemini-3.1-flash-lite thought for 10 s as White · gemini-3.1-pro-preview thought for 272 s as Black

1. e4 gemini-3.1-flash-lite 1 s best

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

1... c5 gemini-3.1-pro-preview 3 s good

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

2. Nf3 gemini-3.1-flash-lite 0 s best

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

2... d6 gemini-3.1-pro-preview 3 s good

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

3. d4 gemini-3.1-flash-lite 0 s best

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

3... cxd4 gemini-3.1-pro-preview 3 s best

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

4. Nxd4 gemini-3.1-flash-lite 1 s best

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

4... Nf6 gemini-3.1-pro-preview 3 s best

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

5. Nc3 gemini-3.1-flash-lite 1 s best

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

5... a6 gemini-3.1-pro-preview 5 s best

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

6. Be3 gemini-3.1-flash-lite 1 s best

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

6... e5 gemini-3.1-pro-preview 7 s best

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

7. Nb3 gemini-3.1-flash-lite 0 s best

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

7... Be6 gemini-3.1-pro-preview 5 s good

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

8. f3 gemini-3.1-flash-lite 0 s good

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

8... Be7 gemini-3.1-pro-preview 5 s best

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

9. Qd2 gemini-3.1-flash-lite 1 s best

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

9... O-O gemini-3.1-pro-preview 6 s good

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

10. O-O-O gemini-3.1-flash-lite 1 s best

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

10... Nbd7 gemini-3.1-pro-preview 9 s best

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

11. g4 gemini-3.1-flash-lite 1 s best

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

11... b5 gemini-3.1-pro-preview 11 s best

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

12. g5 gemini-3.1-flash-lite 0 s best

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

12... b4 gemini-3.1-pro-preview 20 s best

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

13. gxf6 gemini-3.1-flash-lite 0 s inaccuracy

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

13... bxc3 gemini-3.1-pro-preview 14 s best

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

14. Qxc3 gemini-3.1-flash-lite 0 s best

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

14... Nxf6 gemini-3.1-pro-preview 15 s best

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

15. Kb1 gemini-3.1-flash-lite 1 s mistake

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

15... Rc8 gemini-3.1-pro-preview 28 s brilliant

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

16. Qd2 gemini-3.1-flash-lite 1 s best

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

16... a5 gemini-3.1-pro-preview 26 s good

Thought for 26 s. The provider returned no reasoning text for this move.

17. Nxa5 gemini-3.1-flash-lite 1 s mistake

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

17... Qc7 gemini-3.1-pro-preview 13 s inaccuracy

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

18. Qxd6 gemini-3.1-flash-lite 1 s blunder

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

18... Bxd6 gemini-3.1-pro-preview 29 s best

Thought for 29 s. The provider returned no reasoning text for this move.

19. Rxd6 gemini-3.1-flash-lite 1 s inaccuracy

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

19... Qxc2+ gemini-3.1-pro-preview 27 s brilliant

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

20. Ka1 gemini-3.1-flash-lite 1 s best

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

20... Qc1+ gemini-3.1-pro-preview 36 s brilliant

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

21. Bxc1 gemini-3.1-flash-lite 0 s best

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

21... Rxc1# gemini-3.1-pro-preview 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.