Chess
Standard chess, given as FEN. Stockfish 19 scores every legal move by expected score; the answer is a UCI move. See Methodology.
Fewer puzzles than the other models, so results are noisy.
Quality is the mean oracle score of the moves played, × 100. The best move scores 100; an illegal move or no move scores 0. Protocol boardbench-0.2.
Quality vs cost
4 of 4 models
- Anthropic
- OpenAI
- Pareto frontier: nothing plotted is both cheaper and better
- Anthropic
- OpenAI
Horizontal axis is logarithmic.
Table
| Model | Quality | Legality | Cost | n |
|---|---|---|---|---|
| Haiku 5.5Medium | 0.0 | 33.3 | <$0.01 | 9 |
| Sonnet 5.5 (fewer samples)Medium | 0.0 | 66.7 | $0.01 | 3 |
| Luna highMedium | 0.0 | 100.0 | <$0.01 | 9 |
| Sol (fewer samples)Medium | 0.0 | 100.0 | $0.02 | 3 |
Headline is the mean move score × 100. n is answers: puzzles × samples.