Qwen3.8 Flash-Next
Alibaba · open weights · released 2026-08-26 · route qwen3.8-flash-next · Model profile
Opening gap: -441 (95%: -1,107 to +225). The interval includes zero, so we can't yet say whether it performs differently across the variants.
Standard
- Rating
- 20495%: -300 to 709
- Record
- 0 won, 0 drawn, 4 lost of 4
- Accuracy (open positions)
- 72.2
- Accuracy (all moves)
- 78.2
- Average centipawn loss
- 153
- Blunders / mistakes / inaccuracies per 100 moves
- 17.8 / 5.9 / 9.9
- Matched Stockfish's first choice
- 26%
- In Stockfish's top three
- 50%
- Legal on the first try
- 85.4%
- Illegal / invalid
- 22 of 123 answers
- Forfeits
- 2
- Adjudicated games
- 1
- API-equivalent cost per game
- n/a
- API-equivalent cost per move
- n/a
- Seconds per move
- 295.1
- Model minutes per game
- 126.6
- Tokens per move (in / out)
- 446 / 4,548
- Reasoning tokens per move
- n/a
- Aborted on our side (not counted)
- 0
By phase
| Phase | Moves | Accuracy | Centipawn loss | Blunders /100 | Engine match |
|---|---|---|---|---|---|
| Opening | 40 | 85.8 | 98 | 10.0 | 48% |
| Middlegame | 33 | 63.7 | 182 | 27.3 | 12% |
| Endgame | 28 | 48.7 | 198 | 17.9 | 11% |
Chess960
- Rating
- 64595%: 210 to 1,080
- Record
- 1 won, 0 drawn, 3 lost of 4
- Accuracy (open positions)
- 72.4
- Accuracy (all moves)
- 80.3
- Average centipawn loss
- 156
- Blunders / mistakes / inaccuracies per 100 moves
- 14.7 / 3.9 / 13.7
- Matched Stockfish's first choice
- 24%
- In Stockfish's top three
- 47%
- Legal on the first try
- 77.5%
- Illegal / invalid
- 24 of 126 answers
- Forfeits
- 0
- Adjudicated games
- 2
- API-equivalent cost per game
- n/a
- API-equivalent cost per move
- n/a
- Seconds per move
- 292.0
- Model minutes per game
- 124.1
- Tokens per move (in / out)
- 544 / 5,273
- Reasoning tokens per move
- n/a
- Aborted on our side (not counted)
- 0
By phase
| Phase | Moves | Accuracy | Centipawn loss | Blunders /100 | Engine match |
|---|---|---|---|---|---|
| Opening | 36 | 74.3 | 122 | 19.4 | 19% |
| Middlegame | 31 | 58.8 | 241 | 16.1 | 19% |
| Endgame | 35 | 72.0 | 116 | 8.6 | 31% |
Games
Standard as blackLost vs Skill 0, 50% random moves29 plies · forfeit: no legal move · localChess960 as blackLost vs Skill 0, 25% random moves13 plies · checkmate · localStandard as whiteLost vs Skill 0, 50% random moves80 plies · forfeit: no legal move · localChess960 as whiteWon vs Skill 0, 50% random moves93 plies · adjudicated: decisive advantage · localStandard as blackLost vs Skill 0, 10% random moves43 plies · checkmate · localChess960 as blackLost vs Skill 0, 10% random moves31 plies · checkmate · localStandard as whiteLost vs Skill 0, 10% random moves51 plies · adjudicated: decisive advantage · localChess960 as whiteLost vs Skill 0, 10% random moves67 plies · adjudicated: decisive advantage · local