Claude Fable 5 vs Claude Mythos Preview — Who Actually Wins? Real Benchmark Data (2026)

head to head

Claude Fable 5 vs Claude Mythos Preview

4 shared benchmarks

2

wins

0

ties

2

wins

88.0%

BrowseComp

86.9%

92.6%

GPQA Diamond

94.6%

53.3%

Humanity's Last Exam

64.7%

80.3%

SWE-bench Pro

77.8%