Claude Fable 5 vs Claude Opus 4.8 — Who Actually Wins? Real Benchmark Data (2026)

head to head

Claude Fable 5 vs Claude Opus 4.8

26 shared benchmarks

24

wins

1

ties

1

wins

43.3%

APEX-Agents

39.4%

29.1%

AutomationBench

27.2%

90.5%

BabyVision

81.2%

88.0%

BrowseComp

84.3%

88.9%

CharXiv

80.5%

70.0%

DeepSWE

59.0%

86.6%

FrontierSWE

66.7%

92.6%

GPQA Diamond

91.0%

53.3%

Humanity's Last Exam

49.8%

57.4%

JobBench

48.4%

94.8%

MATH-Vision

86.7%

84.7%

MCP-Atlas

77.8%

49.9%

MLS Bench

42.8%

81.2%

MMMU Pro

78.9%

69.9%

OfficeQA Pro

63.9%

89.8%

OmniDocBench

87.9%

57.2%

PerceptionBench

47.2%

41.4%

PostTrain Bench

34.1%

76.8%

Program Bench

71.9%

35.0%

SWE Marathon

40.0%

80.3%

SWE-bench Pro

69.2%

34.7%

SpreadsheetBench 2

31.55%

84.6%

Terminal-Bench 2.1

84.6%

77.9%

Toolathlon-Verified

76.2%

56.7%

WorldVQA

39.1%

23.0%

ZeroBench

17.0%