gemini-3.1-pro-preview vs grok-4.3

Season 1 · Round 2 · 31 July 2026

Seat	Model	Score
gemini-3.1-pro-preview	gemini/gemini-3.1-pro-preview	1
grok-4.3	xai/grok-4.3	0

Won by gemini-3.1-pro-preview on elimination · 55 turns · $1.08 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-pro-preview thought for 606 s as White · grok-4.3 thought for 360 s as Black

1. e4 gemini-3.1-pro-preview 2 s best

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

1... e5 grok-4.3 4 s best

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

2. Nf3 gemini-3.1-pro-preview 3 s best

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

2... Nc6 grok-4.3 4 s best

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

3. Bb5 gemini-3.1-pro-preview 3 s best

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

3... a6 grok-4.3 4 s best

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

4. Ba4 gemini-3.1-pro-preview 3 s best

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

4... Nf6 grok-4.3 6 s best

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

5. O-O gemini-3.1-pro-preview 3 s best

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

5... Be7 grok-4.3 6 s good

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

6. Re1 gemini-3.1-pro-preview 5 s best

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

6... O-O grok-4.3 4 s inaccuracy

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

7. c3 gemini-3.1-pro-preview 17 s inaccuracy

Thought for 17 s. The provider returned no reasoning text for this move.

7... b5 grok-4.3 10 s best

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

8. Bb3 gemini-3.1-pro-preview 5 s best

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

8... Na5 grok-4.3 9 s best

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

9. Bc2 gemini-3.1-pro-preview 9 s best

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

9... c5 grok-4.3 9 s inaccuracy

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

10. d4 gemini-3.1-pro-preview 5 s good

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

10... exd4 grok-4.3 13 s good

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

11. cxd4 gemini-3.1-pro-preview 8 s good

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

11... cxd4 grok-4.3 10 s inaccuracy

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

12. Nxd4 gemini-3.1-pro-preview 19 s good

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

12... d5 grok-4.3 17 s inaccuracy

Thought for 17 s. The provider returned no reasoning text for this move.

13. e5 gemini-3.1-pro-preview 36 s best

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

13... Ne4 grok-4.3 22 s best

Thought for 22 s. The provider returned no reasoning text for this move.

14. Nd2 gemini-3.1-pro-preview 38 s brilliant

Thought for 38 s. The provider returned no reasoning text for this move.

14... Nxd2 grok-4.3 14 s inaccuracy

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

15. Bxd2 gemini-3.1-pro-preview 15 s best

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

15... Nc4 grok-4.3 11 s best

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

16. Bc1 gemini-3.1-pro-preview 42 s inaccuracy

Thought for 42 s. The provider returned no reasoning text for this move.

16... Re8 grok-4.3 27 s mistake

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

17. b3 gemini-3.1-pro-preview 41 s good

Thought for 41 s. The provider returned no reasoning text for this move.

17... Nxe5 grok-4.3 14 s mistake

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

18. Rxe5 gemini-3.1-pro-preview 33 s best

Thought for 33 s. The provider returned no reasoning text for this move.

18... Bf6 grok-4.3 13 s good

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

19. Rxe8+ gemini-3.1-pro-preview 36 s best

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

19... Qxe8 grok-4.3 3 s best

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

20. Be3 gemini-3.1-pro-preview 37 s brilliant

Thought for 37 s. The provider returned no reasoning text for this move.

20... Bb7 grok-4.3 21 s best

Thought for 21 s. The provider returned no reasoning text for this move.

21. Qd3 gemini-3.1-pro-preview 19 s best

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

21... Qe4 grok-4.3 20 s good

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

22. Qxe4 gemini-3.1-pro-preview 20 s inaccuracy

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

22... dxe4 grok-4.3 23 s best

Thought for 23 s. The provider returned no reasoning text for this move.

23. Rd1 gemini-3.1-pro-preview 42 s best

Thought for 42 s. The provider returned no reasoning text for this move.

23... Rd8 grok-4.3 16 s good

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

24. h3 gemini-3.1-pro-preview 21 s good

Thought for 21 s. The provider returned no reasoning text for this move.

24... Bxd4 grok-4.3 12 s good

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

25. Bxd4 gemini-3.1-pro-preview 35 s good

Thought for 35 s. The provider returned no reasoning text for this move.

25... Rd5 grok-4.3 15 s inaccuracy

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

26. Bxe4 gemini-3.1-pro-preview 84 s best

Thought for 84 s. The provider returned no reasoning text for this move.

26... Rxd4 grok-4.3 24 s good

Thought for 24 s. The provider returned no reasoning text for this move.

27. Rxd4 gemini-3.1-pro-preview 26 s best

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

27... Bxe4 grok-4.3 30 s inaccuracy

Thought for 30 s. The provider returned no reasoning text for this move.

28. Rd8# gemini-3.1-pro-preview 3 s best

Thought for 3 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.