GPT-6.1 Sol
Openai · released 2026-09-29 · route gpt-6.1-sol · Model profile
Opening gap: -46 (95%: -284 to +192). The interval includes zero, so we can't yet say whether it performs differently across the variants.
Standard
- Rating
- 1,49795%: 1,326 to 1,668
- Record
- 8 won, 2 drawn, 14 lost of 24
- Accuracy (open positions)
- 88.4
- Accuracy (all moves)
- 90.2
- Average centipawn loss
- 50
- Blunders / mistakes / inaccuracies per 100 moves
- 4.4 / 2.4 / 8.9
- Matched Stockfish's first choice
- 40%
- In Stockfish's top three
- 66%
- Legal on the first try
- 98.5%
- Illegal / invalid
- 14 of 923 answers
- Forfeits
- 0
- Adjudicated games
- 15
- API-equivalent cost per game
- $0.835
- API-equivalent cost per move
- $0.022
- Seconds per move
- 34.5
- Model minutes per game
- 21.7
- Tokens per move (in / out)
- 13,492 / 959
- Reasoning tokens per move
- 927
- Aborted on our side (not counted)
- 3
By phase
| Phase | Moves | Accuracy | Centipawn loss | Blunders /100 | Engine match |
|---|---|---|---|---|---|
| Opening | 240 | 93.0 | 23 | 2.1 | 47% |
| Middlegame | 414 | 83.9 | 68 | 7.2 | 34% |
| Endgame | 255 | 91.0 | 46 | 2.0 | 44% |
Chess960
- Rating
- 1,54395%: 1,377 to 1,708
- Record
- 14 won, 2 drawn, 8 lost of 24
- Accuracy (open positions)
- 83.6
- Accuracy (all moves)
- 86.0
- Average centipawn loss
- 73
- Blunders / mistakes / inaccuracies per 100 moves
- 7.6 / 5.8 / 10.7
- Matched Stockfish's first choice
- 37%
- In Stockfish's top three
- 64%
- Legal on the first try
- 98.3%
- Illegal / invalid
- 15 of 818 answers
- Forfeits
- 0
- Adjudicated games
- 13
- API-equivalent cost per game
- $0.959
- API-equivalent cost per move
- $0.029
- Seconds per move
- 49.8
- Model minutes per game
- 27.8
- Tokens per move (in / out)
- 16,731 / 1,453
- Reasoning tokens per move
- 1,403
- Aborted on our side (not counted)
- 2
By phase
| Phase | Moves | Accuracy | Centipawn loss | Blunders /100 | Engine match |
|---|---|---|---|---|---|
| Opening | 238 | 82.2 | 65 | 9.7 | 30% |
| Middlegame | 324 | 81.9 | 87 | 8.6 | 40% |
| Endgame | 241 | 88.3 | 61 | 4.2 | 41% |
Games
Standard as blackLost vs Stockfish 132072 plies · adjudicated: decisive advantage · $1.05Standard as blackWon vs Stockfish 132048 plies · checkmate · $0.449Chess960 as blackWon vs Stockfish 132056 plies · adjudicated: decisive advantage · $0.717Standard as whiteLost vs Stockfish Skill 472 plies · checkmate · $0.894Chess960 as whiteLost vs Stockfish Skill 438 plies · checkmate · $0.544Standard as blackLost vs Stockfish Skill 261 plies · checkmate · $0.515Chess960 as blackLost vs Stockfish Skill 233 plies · checkmate · $0.398Standard as whiteWon vs Stockfish Skill 087 plies · adjudicated: decisive advantage · $1.11Chess960 as whiteLost vs Stockfish 150093 plies · adjudicated: decisive advantage · $1.47Standard as blackLost vs Stockfish 170042 plies · adjudicated: decisive advantage · $0.484Chess960 as blackWon vs Stockfish 170028 plies · adjudicated: decisive advantage · $0.335Chess960 as whiteWon vs Stockfish Skill 2105 plies · checkmate · $1.61Standard as whiteLost vs Stockfish Skill 268 plies · checkmate · $0.983Standard as blackLost vs Stockfish 132070 plies · adjudicated: decisive advantage · $0.908Chess960 as blackWon vs Stockfish 132078 plies · adjudicated: decisive advantage · $1.11Standard as whiteLost vs Stockfish 190063 plies · adjudicated: decisive advantage · $0.679Chess960 as whiteWon vs Stockfish Skill 443 plies · adjudicated: decisive advantage · $0.610Standard as blackLost vs Stockfish 170068 plies · adjudicated: decisive advantage · $0.959Chess960 as blackDrew vs Stockfish 1500112 plies · threefold repetition · $1.32Standard as whiteLost vs Stockfish Skill 2101 plies · adjudicated: decisive advantage · $1.19Chess960 as whiteWon vs Stockfish 132039 plies · adjudicated: decisive advantage · $0.473Standard as blackLost vs Stockfish 190071 plies · checkmate · $0.744Chess960 as blackLost vs Stockfish 170086 plies · adjudicated: decisive advantage · $1.26Standard as whiteWon vs Stockfish 170089 plies · adjudicated: decisive advantage · $0.698Chess960 as whiteWon vs Stockfish Skill 063 plies · adjudicated: decisive advantage · $0.769Standard as blackWon vs Stockfish Skill 074 plies · adjudicated: decisive advantage · $0.759Chess960 as blackLost vs Stockfish 132039 plies · checkmate · $0.615Standard as whiteLost vs Stockfish 2100141 plies · adjudicated: decisive advantage · $1.62Chess960 as whiteDrew vs Stockfish Skill 4121 plies · threefold repetition · $2.12Standard as blackLost vs Stockfish Skill 478 plies · adjudicated: decisive advantage · $0.966Chess960 as blackWon vs Stockfish Skill 048 plies · adjudicated: decisive advantage · $0.690Standard as whiteDrew vs Stockfish 170082 plies · threefold repetition · $0.806Chess960 as whiteWon vs Stockfish 132073 plies · checkmate · $1.23Standard as blackDrew vs Stockfish 1900120 plies · adjudicated: dead level · $1.29Chess960 as blackWon vs Stockfish Skill 042 plies · adjudicated: decisive advantage · $0.550Standard as whiteLost vs Stockfish Skill 464 plies · checkmate · $0.741Chess960 as whiteLost vs Stockfish Skill 016 plies · checkmate · $0.273Chess960 as blackWon vs Skill 0, 10% random moves58 plies · checkmate · $0.938Standard as whiteWon vs Stockfish 190075 plies · checkmate · $0.772Chess960 as whiteLost vs Stockfish 170052 plies · checkmate · $0.625Standard as blackLost vs Stockfish Skill 480 plies · adjudicated: decisive advantage · $0.918Chess960 as blackWon vs Skill 0, 10% random moves124 plies · adjudicated: decisive advantage · $1.64Chess960 as whiteWon vs Skill 0, 10% random moves125 plies · adjudicated: decisive advantage · $1.73Standard as whiteWon vs Stockfish Skill 281 plies · adjudicated: decisive advantage · $0.648Chess960 as blackLost vs Stockfish 150084 plies · adjudicated: decisive advantage · $1.28Standard as blackWon vs Stockfish 150060 plies · adjudicated: decisive advantage · $0.476Standard as whiteWon vs Skill 0, 25% random moves45 plies · checkmate · $0.390Chess960 as whiteWon vs Skill 0, 25% random moves43 plies · checkmate · $0.699