Claude Fable 5 vs Claude Opus 4.6 — Who Actually Wins? Real Benchmark Data (2026)

head to head

Claude Fable 5 vs Claude Opus 4.6

5 shared benchmarks

5

wins

0

ties

0

wins

88.0%

BrowseComp

84.0%

88.9%

CharXiv

61.5%

92.6%

GPQA Diamond

91.3%

53.3%

Humanity's Last Exam

40.0%

80.3%

SWE-bench Pro

53.4%