GPT-5.3 Codex
Benchmark scores
| Benchmark | Category | Rank | Score | Captured |
|---|---|---|---|---|
| Terminal-Bench 2.0 | agents | #4 | 78.7% | 2026-02-22 |
| METR Time Horizon | agents | #4 | 5h50m | 2026-02-05 |
| AA Coding Index | code | #4 | 53.1% | 2026-05-02 |
| OpenRouter · Weekly Usage | usage | #22 | #48 | 2026-05-02 |