GSO-Bench — leaderboard
102 software optimization challenges across 10 codebases in 5 languages. Models must improve runtime efficiency to match expert developers. Includes hack detection to prevent deceptive optimizations.
Metric: Opt@1 (%). Source: gso-bench.github.io. Status: saturation imminent. 30 models tracked.
Top models
| # | Model | Score |
|---|---|---|
| 1 | Claude Opus 4.8 | 47.06 |
| 2 | Claude Opus 4.7 | 44.12 |
| 3 | Claude Opus 4.6 | 41.18 |
| 4 | GPT-5.5 | 40.2 |
| 5 | Claude Sonnet 5 | 37.25 |
| 6 | GPT-5.4 | 31.37 |
| 7 | GPT-5.2 | 27.45 |
| 8 | Claude Opus 4.5 | 26.47 |
| 9 | Gemini 3.1 Pro (Preview) | 22.55 |
| 10 | Gemini 3 Pro | 18.63 |
| 11 | Claude Sonnet 4.5 | 14.71 |
| 12 | GPT-5.1 | 13.73 |
| 13 | O4 Mini | 12.7 |
| 14 | Gemini 3 Flash | 9.8 |
| 15 | O3 | 8.82 |
Interactive version: theaggregate.ai/benchmark?slug=gso-bench · How the rankings work · Data refreshed daily, snapshot 2026-07-22.