Connect Four
7×6 Connect Four, given as the columns played. An exact solver scores every column by win, draw or loss and how soon; the answer is a column. See Methodology.
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
7 of 7 models
- Anthropic
- OpenAI
- DeepSeek
- Z.ai
- Meta
- Pareto frontier: nothing plotted is both cheaper and better
- Anthropic
- OpenAI
- DeepSeek
- Z.ai
- Meta
Horizontal axis is logarithmic.
Table
| Model | Quality | Legality | Cost | n |
|---|---|---|---|---|
| Haiku 5.5High | 80.4 | 100.0 | <$0.01 | 3 |
| GLM-5.3 FlashHigh | 66.7 | 100.0 | $0.03 | 3 |
| LunaHigh | 66.7 | 100.0 | $0.01 | 3 |
| SolHigh | 66.7 | 100.0 | $0.10 | 3 |
| Opus 5.5High | 47.1 | 100.0 | $0.08 | 3 |
| DeepSeek V4.1 FlashHigh | 33.3 | 100.0 | $0.04 | 3 |
| Muse Spark 1.3High | 13.8 | 66.7 | $0.15 | 3 |
Headline is the mean move score × 100. n is answers: puzzles × samples.