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

head to head

Claude Mythos Preview vs Claude Sonnet 4.6

5 shared benchmarks

5

wins

0

ties

0

wins

86.9%

BrowseComp

74.0%

94.6%

GPQA Diamond

89.9%

79.6%

OSWorld

72.5%

93.9%

SWE-bench Verified

79.6%

82.0%

Terminal-Bench 2.0

59.1%