Calibration
VulcanBench v3 → CursorBench 4.0
CursorBench 4.0 is estimated from VulcanBench v3 with a offset logistic curve fitted on 5 models measured on both: y = 0.3507 + (0.4866 − 0.3507) / (1 + exp(−199.55·(x − 0.8687))), R² = 0.65, cross-validated error 3.6 pp. It is used for 0 estimates.
Fitted on
| Model | VulcanBench v3 | CursorBench 4.0 |
|---|---|---|
| Claude Opus 5 | 87.0% | 46.6% |
| GPT-5.6 Luna | 85.5% | 35.9% |
| GPT-5.6 Sol | 87.0% | 41.7% |
| GPT-5.6 Terra | 87.0% | 41.3% |
| Grok 4.6 | 87.0% | 41.4% |