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

OpenAI

GPT-5.3 Codex

6 benchmarks

GPQA Diamond

#7 of 49

91.5%

SWE-bench Verified

#7 of 40

80.0%

Terminal-Bench 2.0

#5 of 14

77.3%

OSWorld

#8 of 16

64.0%

SWE-bench Pro

#4 of 13

56.8%

Humanity's Last Exam

#13 of 24

39.9%