Claude Fable 5.1
Anthropic · released 2026-09-01 · route claude-fable-5-1 · Model profile · Chess results
Results
- Score
- 9395%: 83 to 100
- Grids solved
- 39 of 42
- Blank cells filled correctly
- 97.6%
- Wrong cells / empty cells / changed a given / no grid
- 2 / 0 / 1 / 0
- Broke the rules (complete grid repeating a digit)
- 2
- Near misses (three cells or fewer wrong)
- 2
- Average stated confidence
- 97%
- Average confidence when it had not solved it
- 68%
- Sure but wrong (90% or more, unsolved)
- 2
- Calibration (Brier, lower is better)
- 0.047
- API-equivalent cost per grid
- $0.894
- API-equivalent cost per solved grid
- $0.963
- Seconds per grid
- 173
- Tokens per grid (in / out)
- 2,235 / 16,999
- Reasoning tokens per grid
- 15,035
- Retries for an unreadable reply
- 1
- Aborted on our side (not counted)
- 0
By tier
| Tier | Needs | Solved | Output tokens | Seconds |
|---|---|---|---|---|
| Cozy | Singles only | 6 of 6 | 5,128 | 56 |
| Gentle | Scanning | 6 of 6 | 10,788 | 109 |
| Steady | Locked candidates | 6 of 6 | 16,626 | 170 |
| Tricky | Hidden pairs and triples | 4 of 6 | 11,143 | 122 |
| Devious | Wings and fish | 5 of 6 | 9,188 | 93 |
| Expert | Deep wings and fish | 6 of 6 | 23,410 | 250 |
| Beyond | No human technique finishes it | 6 of 6 | 42,711 | 413 |
Cells by the technique they needed
Each blank cell is tagged with the simplest technique that fills it, given everything a solver could fill before it.
| Technique | Cells | Filled correctly |
|---|---|---|
| Last free cell | 432 | 99.3% |
| Scanning | 674 | 99.4% |
| Locked candidates | 274 | 100.0% |
| Hidden pairs and triples | 258 | 82.6% |
| Wings and fish | 165 | 98.8% |
| Deep wings and fish | 181 | 100.0% |
| Search | 249 | 100.0% |
Every answer
Cozy #1Solved 50 of 50 cells100% sure · 6,935 tokens · $0.365Cozy #2Solved 48 of 48 cells99% sure · 4,617 tokens · $0.249Cozy #3Solved 49 of 49 cells99% sure · 5,501 tokens · $0.293Cozy #4Solved 50 of 50 cells99% sure · 4,992 tokens · $0.268Cozy #5Solved 49 of 49 cells99% sure · 5,080 tokens · $0.272Cozy #6Solved 39 of 39 cells99% sure · 3,644 tokens · $0.200Gentle #1Solved 56 of 56 cells99% sure · 12,739 tokens · $0.655Gentle #2Solved 51 of 51 cells99% sure · 14,829 tokens · $0.760Gentle #3Solved 52 of 52 cells99% sure · 7,537 tokens · $0.395Gentle #4Solved 51 of 51 cells99% sure · 7,561 tokens · $0.396Gentle #5Solved 56 of 56 cells99% sure · 12,705 tokens · $0.654Gentle #6Solved 52 of 52 cells99% sure · 9,360 tokens · $0.486Steady #1Solved 53 of 53 cells99% sure · 11,281 tokens · $0.582Steady #2Solved 53 of 53 cells99% sure · 9,998 tokens · $0.518Steady #3Solved 49 of 49 cells99% sure · 14,410 tokens · $0.739Steady #4Solved 54 of 54 cells98% sure · 27,307 tokens · $1.38Steady #5Solved 53 of 53 cells99% sure · 9,572 tokens · $0.497Steady #6Solved 54 of 54 cells99% sure · 27,190 tokens · $1.38Tricky #1Solved 55 of 55 cells100% sure · 15,148 tokens · $0.775Tricky #2Solved 57 of 57 cells99% sure · 10,700 tokens · $0.553Tricky #3Solved 57 of 57 cells99% sure · 15,031 tokens · $0.770Tricky #4Solved 54 of 54 cells100% sure · 12,679 tokens · $0.652Tricky #5Wrong cells 53 of 55 cells99% sure · 12,423 tokens · $0.639Tricky #6Changed a given digit 6 of 56 cells5% sure · 879 tokens · $0.062Devious #1Solved 55 of 55 cells99% sure · 10,330 tokens · $0.535Devious #2Solved 55 of 55 cells99% sure · 13,552 tokens · $0.696Devious #3Solved 49 of 49 cells99% sure · 8,315 tokens · $0.434Devious #4Wrong cells 38 of 40 cells99% sure · 5,441 tokens · $0.290Devious #5Solved 47 of 47 cells99% sure · 7,648 tokens · $0.401Devious #6Solved 54 of 54 cells99% sure · 9,839 tokens · $0.510Expert #1Solved 58 of 58 cells97% sure · 28,310 tokens · $1.43Expert #2Solved 53 of 53 cells99% sure · 10,177 tokens · $0.527Expert #3Solved 54 of 54 cells97% sure · 43,571 tokens · $2.20Expert #4Solved 57 of 57 cells99% sure · 17,430 tokens · $0.890Expert #5Solved 58 of 58 cells99% sure · 19,958 tokens · $1.02Expert #6Solved 54 of 54 cells99% sure · 21,017 tokens · $1.07Beyond #1Solved 60 of 60 cells99% sure · 78,775 tokens · $5.05Beyond #2Solved 57 of 57 cells99% sure · 23,019 tokens · $1.17Beyond #3Solved 56 of 56 cells99% sure · 51,505 tokens · $2.59Beyond #4Solved 57 of 57 cells99% sure · 18,866 tokens · $0.962Beyond #5Solved 59 of 59 cells97% sure · 35,274 tokens · $1.78Beyond #6Solved 57 of 57 cells99% sure · 48,825 tokens · $2.46