GPT-5.3 Codex vs GPT-5.4 — Who Actually Wins? Real Benchmark Data (2026)

head to head

GPT-5.3 Codex vs GPT-5.4

6 shared benchmarks

2

wins

0

ties

4

wins

91.5%

GPQA Diamond

92.8%

39.9%

Humanity's Last Exam

36.24%

64.0%

OSWorld

75.0%

56.8%

SWE-bench Pro

57.7%

80.0%

SWE-bench Verified

77.2%

77.3%

Terminal-Bench 2.0

81.8%