# SWE-bench Pro → FrontierCode 1.1 Main

Calibration · https://benchgap.net/calibration/1461 · data retrieved 2026-10-29

FrontierCode 1.1 Main is estimated from SWE-bench Pro with a Michaelis–Menten curve fitted on 8 models measured on both: y = 2.0000·x / (2.39264 + x), R² = 0.73, cross-validated error 5.5 pp. It is used for 10 estimates.

| Estimated model | SWE-bench Pro | FrontierCode 1.1 Main | Source |
|---|---|---|---|
| [Sakana Fugu-Ultra](https://benchgap.net/model/sakana-fugu-ultra.md) | 73.7% | 47.1% | estimated ± 5.5 pp, medium confidence |
| [Sage-A1.5](https://benchgap.net/model/sage-a1-5.md) | 61.2% | 40.7% | estimated ± 5.5 pp, medium confidence |
| [Atria Dawn Preview](https://benchgap.net/model/atria-dawn-preview.md) | 59.6% | 39.9% | estimated ± 5.5 pp, medium confidence |
| [Laguna S 2.1](https://benchgap.net/model/laguna-s-2-1.md) | 59.4% | 39.8% | estimated ± 5.5 pp, medium confidence |
| [Sakana Fugu](https://benchgap.net/model/sakana-fugu.md) | 59.0% | 39.6% | estimated ± 5.5 pp, medium confidence |
| [Spark-X2.6-4B](https://benchgap.net/model/spark-x2-6-4b.md) | 54.3% | 37.0% | estimated ± 5.5 pp, medium confidence |
| [Granite 4.2 30B](https://benchgap.net/model/granite-4-2-30b.md) | 33.3% | 24.4% | estimated ± 5.5 pp, low confidence |
| [LLaDA2.2-flash](https://benchgap.net/model/llada2-2-flash.md) | 30.1% | 22.3% | estimated ± 5.5 pp, low confidence |
| [Mellum2.1-12B-A2.5B-Thinking](https://benchgap.net/model/mellum2-1-12b-a2-5b-thinking.md) | 28.0% | 21.0% | estimated ± 5.5 pp, low confidence |
| [Granite 4.2 8B](https://benchgap.net/model/granite-4-2-8b.md) | 19.1% | 14.8% | estimated ± 5.5 pp, low confidence |

## Fitted on

| Model | SWE-bench Pro | FrontierCode 1.1 Main |
|---|---|---|
| [Claude Fable 5](https://benchgap.net/model/claude-fable.md) | 80.0% | 53.5% |
| [Claude Opus 4.6](https://benchgap.net/model/claude-opus-4-6.md) | 53.4% | 26.9% |
| [Claude Opus 4.8](https://benchgap.net/model/claude-opus-4-8.md) | 69.2% | 46.5% |
| [Claude Opus 5](https://benchgap.net/model/claude-opus-5.md) | 79.2% | 53.4% |
| [Claude Opus 5.5](https://benchgap.net/model/claude-opus-5-5.md) | 89.9% | 54.4% |
| [Claude Sonnet 5](https://benchgap.net/model/claude-sonnet-5.md) | 63.2% | 42.7% |
| [Claude Sonnet 5.5](https://benchgap.net/model/claude-sonnet-5-5.md) | 81.3% | 46.2% |
| [GPT-5.5](https://benchgap.net/model/gpt-5-5.md) | 58.6% | 43.0% |