CORE-Bench v1.1 (Codex CLI): leaderboard
Metric: Task accuracy (%) on the 39 CORE-Bench v1.1 tasks (CORE-Bench Hard with 15 task errors and 20 shortcut tasks fixed plus 10 new tasks): reproduce a paper's computational results from its code capsule given only the README, code and data, and answer the task questions; Codex CLI scaffold with default settings (subagents off), reasoning effort as labeled; higher is better. Source: arxiv.org. Saturation forecast: Estimated already saturated. 8 models tracked.
Top models
| # | Model | Score |
|---|---|---|
| 1 | GPT-5.4 (High) | 97.4 |
| 2 | GPT-5.4 (xHigh) | 97.4 |
| 3 | GPT-5.2 (Medium) | 94.9 |
| 4 | GPT-5.4 (Medium) | 94.9 |
| 5 | GPT-5.4 (Low) | 92.3 |
| 6 | GPT-5.1 (Medium) | 87.2 |
| 7 | GPT-5 (Medium) | 84.6 |
Interactive version: theaggregate.ai/benchmark?slug=core-bench-v1-1-codex-cli · How It Works · Data refreshed daily, snapshot 2026-09-29.