GPT-5.3 Codex — Real Scores Across 6 Benchmarks (2026)

OpenAI

GPT-5.3 Codex

6 benchmarks

GPQA Diamond

#21 of 118

91.5%

SWE-bench Verified

#10 of 86

80.0%

Terminal-Bench 2.0

#6 of 29

77.3%

OSWorld

#13 of 31

64.0%

SWE-bench Pro

#21 of 43

56.8%

Humanity's Last Exam

#40 of 72

39.9%