GPT-6 Astra
Openai · released 2026-09-03 · route gpt-6-astra · Model profile
Opening gap: +265 (95%: +29 to +500). Its standard chess rating is higher. This comparison alone cannot isolate the reason.
Standard
- Rating
- 1,56995%: 1,400 to 1,738
- Record
- 16 won, 0 drawn, 8 lost of 24
- Accuracy (open positions)
- 89.2
- Accuracy (all moves)
- 91.3
- Average centipawn loss
- 42
- Blunders / mistakes / inaccuracies per 100 moves
- 3.9 / 3.1 / 7.5
- Matched Stockfish's first choice
- 44%
- In Stockfish's top three
- 68%
- Legal on the first try
- 98.8%
- Illegal / invalid
- 10 of 811 answers
- Forfeits
- 0
- Adjudicated games
- 18
- API-equivalent cost per game
- $2.23
- API-equivalent cost per move
- $0.067
- Seconds per move
- 26.3
- Model minutes per game
- 14.6
- Tokens per move (in / out)
- 10,584 / 450
- Reasoning tokens per move
- 434
- Aborted on our side (not counted)
- 0
By phase
| Phase | Moves | Accuracy | Centipawn loss | Blunders /100 | Engine match |
|---|---|---|---|---|---|
| Opening | 240 | 94.0 | 18 | 0.4 | 49% |
| Middlegame | 354 | 86.4 | 49 | 5.7 | 44% |
| Endgame | 207 | 86.1 | 60 | 4.8 | 40% |
Chess960
- Rating
- 1,30595%: 1,141 to 1,468
- Record
- 14 won, 1 drawn, 9 lost of 24
- Accuracy (open positions)
- 83.7
- Accuracy (all moves)
- 88.1
- Average centipawn loss
- 63
- Blunders / mistakes / inaccuracies per 100 moves
- 5.7 / 4.0 / 11.5
- Matched Stockfish's first choice
- 34%
- In Stockfish's top three
- 59%
- Legal on the first try
- 97.9%
- Illegal / invalid
- 16 of 718 answers
- Forfeits
- 0
- Adjudicated games
- 18
- API-equivalent cost per game
- $2.53
- API-equivalent cost per move
- $0.086
- Seconds per move
- 40.4
- Model minutes per game
- 19.7
- Tokens per move (in / out)
- 11,811 / 737
- Reasoning tokens per move
- 716
- Aborted on our side (not counted)
- 0
By phase
| Phase | Moves | Accuracy | Centipawn loss | Blunders /100 | Engine match |
|---|---|---|---|---|---|
| Opening | 240 | 84.0 | 54 | 6.2 | 30% |
| Middlegame | 322 | 82.5 | 72 | 7.1 | 37% |
| Endgame | 140 | 87.3 | 57 | 1.4 | 34% |
Games
Standard as blackWon vs Stockfish 1320144 plies · adjudicated: decisive advantage · $5.49Chess960 as blackLost vs Skill 0, 10% random moves72 plies · adjudicated: decisive advantage · $4.32Standard as whiteWon vs Stockfish Skill 445 plies · adjudicated: decisive advantage · $1.45Chess960 as whiteWon vs Stockfish Skill 251 plies · adjudicated: decisive advantage · $2.41Standard as blackWon vs Stockfish 150078 plies · adjudicated: decisive advantage · $2.42Chess960 as blackLost vs Stockfish 132064 plies · adjudicated: decisive advantage · $2.10Standard as whiteWon vs Stockfish 132047 plies · adjudicated: decisive advantage · $1.64Chess960 as whiteWon vs Skill 0, 10% random moves87 plies · adjudicated: decisive advantage · $3.87Standard as blackLost vs Stockfish 1700112 plies · adjudicated: decisive advantage · $3.81Chess960 as blackLost vs Stockfish 150092 plies · adjudicated: decisive advantage · $3.93Standard as whiteWon vs Stockfish 150071 plies · adjudicated: decisive advantage · $2.14Chess960 as whiteWon vs Stockfish 132051 plies · adjudicated: decisive advantage · $2.27Standard as blackWon vs Skill 0, 10% random moves60 plies · adjudicated: decisive advantage · $2.02Chess960 as blackWon vs Skill 0, 10% random moves40 plies · adjudicated: decisive advantage · $1.44Standard as whiteLost vs Stockfish Skill 472 plies · checkmate · $2.44Chess960 as whiteDrew vs Stockfish Skill 2131 plies · threefold repetition · $5.69Standard as blackLost vs Stockfish 150092 plies · adjudicated: decisive advantage · $2.97Chess960 as blackLost vs Stockfish 132080 plies · adjudicated: decisive advantage · $3.23Standard as whiteWon vs Stockfish 132051 plies · adjudicated: decisive advantage · $1.49Chess960 as whiteWon vs Skill 0, 10% random moves67 plies · checkmate · $2.92Standard as blackLost vs Stockfish 170082 plies · adjudicated: decisive advantage · $2.67Chess960 as blackWon vs Stockfish Skill 036 plies · adjudicated: decisive advantage · $1.49Standard as whiteWon vs Stockfish 150053 plies · adjudicated: decisive advantage · $1.44Chess960 as whiteWon vs Stockfish 132041 plies · adjudicated: decisive advantage · $1.63Standard as blackWon vs Skill 0, 10% random moves32 plies · checkmate · $0.863Chess960 as blackWon vs Skill 0, 25% random moves64 plies · adjudicated: decisive advantage · $2.54Standard as whiteLost vs Stockfish Skill 467 plies · adjudicated: decisive advantage · $2.80Chess960 as whiteLost vs Stockfish 150063 plies · adjudicated: decisive advantage · $2.66Standard as blackWon vs Stockfish Skill 066 plies · checkmate · $1.96Chess960 as blackLost vs Stockfish 132053 plies · checkmate · $2.20Standard as whiteWon vs Stockfish 132051 plies · adjudicated: decisive advantage · $1.55Chess960 as whiteWon vs Skill 0, 10% random moves57 plies · adjudicated: decisive advantage · $2.60Standard as blackWon vs Stockfish 150040 plies · checkmate · $0.991Chess960 as blackLost vs Stockfish Skill 021 plies · checkmate · $0.805Standard as whiteLost vs Stockfish Skill 063 plies · adjudicated: decisive advantage · $2.42Chess960 as whiteLost vs Stockfish 132050 plies · checkmate · $2.27Standard as blackWon vs Skill 0, 10% random moves46 plies · checkmate · $1.31Chess960 as blackWon vs Skill 0, 10% random moves42 plies · adjudicated: decisive advantage · $1.56Standard as whiteWon vs Stockfish 150063 plies · checkmate · $2.00Chess960 as whiteWon vs Stockfish Skill 079 plies · adjudicated: decisive advantage · $2.90Standard as blackLost vs Stockfish 1320106 plies · adjudicated: decisive advantage · $3.17Chess960 as blackWon vs Skill 0, 10% random moves42 plies · adjudicated: decisive advantage · $2.35Standard as whiteWon vs Skill 0, 10% random moves49 plies · adjudicated: decisive advantage · $1.48Chess960 as whiteWon vs Skill 0, 25% random moves27 plies · checkmate · $0.961Standard as blackLost vs Stockfish 150072 plies · adjudicated: decisive advantage · $3.67Chess960 as blackWon vs Skill 0, 25% random moves34 plies · adjudicated: decisive advantage · $1.19Standard as whiteWon vs Skill 0, 25% random moves29 plies · adjudicated: decisive advantage · $1.26Chess960 as whiteLost vs Skill 0, 25% random moves51 plies · adjudicated: decisive advantage · $3.35