Claude Mythos Preview vs Claude Opus 4.6 — Who Actually Wins? Real Benchmark Data (2026)

head to head

Claude Mythos Preview vs Claude Opus 4.6

10 shared benchmarks

10

wins

0

ties

0

wins

86.9%

BrowseComp

84.0%

83.1%

CyberGym

66.6%

94.6%

GPQA Diamond

91.3%

56.8%

Humanity's Last Exam

53.1%

79.6%

OSWorld

72.7%

87.3%

SWE-bench Multilingual

77.8%

59.0%

SWE-bench Multimodal

27.1%

93.9%

SWE-bench Verified

81.42%

82.0%

Terminal-Bench 2.0

81.8%

97.6%

USAMO 2026

42.3%