Claude Mythos Preview vs GPT-5.2 — Who Actually Wins? Real Benchmark Data (2026)

head to head

Claude Mythos Preview vs GPT-5.2

3 shared benchmarks

3

wins

0

ties

0

wins

94.6%

GPQA Diamond

92.4%

56.8%

Humanity's Last Exam

27.8%

93.9%

SWE-bench Verified

80.0%