OpenAIclosed weightsReasoning
GPT-5.3 Codex
Coding-specialised.
Feb 5, 2026
$1.75 / $14
$4.81
400K
Benchmark scores
| Benchmark | Score | Δ vs prior | Rank (current) | Configuration | Source |
|---|---|---|---|---|---|
SWE-bench Verified | 85% | #2 of 9 | leaderboard | benchlm.ai ↗ | |
τ²-bench (Telecom) | 86% | #6 of 10 | leaderboard | benchlm.ai ↗ | |
Artificial Analysis Intelligence Index | 44.3 | #4 of 11 | leaderboard | benchlm.ai ↗ |