GPT-5.3 Codex
Benchmark scores
| Benchmark | Category | Rank | Score | Captured |
|---|---|---|---|---|
| METR Time Horizon | agents | #4 | 5h50m | 2026-02-05 |
| AA Coding Index | code | #5 | 53.1% | 2026-06-16 |
| Terminal-Bench 2.0 | agents | #6 | 82.0% | 2026-03-26 |
| OpenRouter · Weekly Usage | usage | #21 | #48 | 2026-06-09 |