# VulcanBench v3 → CursorBench 4.0

Calibration · https://benchgap.net/calibration/1664 · data retrieved 2026-10-29

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](https://benchgap.net/model/claude-opus-5.md) | 87.0% | 46.6% |
| [GPT-5.6 Luna](https://benchgap.net/model/gpt-5-6-luna.md) | 85.5% | 35.9% |
| [GPT-5.6 Sol](https://benchgap.net/model/gpt-5-6-sol.md) | 87.0% | 41.7% |
| [GPT-5.6 Terra](https://benchgap.net/model/gpt-5-6-terra.md) | 87.0% | 41.3% |
| [Grok 4.6](https://benchgap.net/model/grok-4-6.md) | 87.0% | 41.4% |