GPT-5.5 vs Claude Fable 5 — Who Actually Wins? Real Benchmark Data (2026)

head to head

GPT-5.5 vs Claude Fable 5

32 shared benchmarks

2

wins

1

ties

29

wins

38.5%

APEX-Agents

43.3%

46.9%

Agents' Last Exam

40.5%

22.7%

AutomationBench

29.1%

83.6%

BabyVision

90.5%

84.4%

BrowseComp

88.0%

84.1%

CharXiv

88.9%

67.0%

DeepSWE

70.0%

47.9%

ExploitBench

78.0%

51.7%

FrontierMath

87.0%

35.4%

FrontierMath Tier 4

87.8%

64.9%

FrontierSWE

86.6%

93.5%

GPQA Diamond

92.6%

41.4%

Humanity's Last Exam

53.3%

38.3%

JobBench

57.4%

92.2%

MATH-Vision

94.8%

82.8%

MCP-Atlas

84.7%

35.5%

MLS Bench

49.9%

81.2%

MMMU Pro

81.2%

78.7%

OSWorld-Verified

85.0%

60.9%

OfficeQA Pro

69.9%

89.4%

OmniDocBench

89.8%

55.8%

PerceptionBench

57.2%

28.4%

PostTrain Bench

41.4%

70.8%

Program Bench

76.8%

14.0%

SWE Marathon

35.0%

58.6%

SWE-bench Pro

80.3%

29.05%

SpreadsheetBench 2

34.7%

83.4%

Terminal-Bench 2.1

84.6%

55.6%

Toolathlon

61.7%

73.5%

Toolathlon-Verified

77.9%

38.5%

WorldVQA

56.7%

22.0%

ZeroBench

23.0%