GPT-5.5 vs GPT-5.4 — Who Actually Wins? Real Benchmark Data (2026)

head to head

GPT-5.5 vs GPT-5.4

17 shared benchmarks

16

wins

1

ties

0

wins

85.0%

ARC-AGI 2

73.3%

0.43%

ARC-AGI 3

0.26%

46.9%

Agents' Last Exam

44.7%

84.4%

BrowseComp

82.7%

81.8%

CyberGym

79.0%

67.0%

DeepSWE

52.0%

51.7%

FrontierMath

47.6%

35.4%

FrontierMath Tier 4

27.1%

84.9%

GDPval

83.0%

93.5%

GPQA Diamond

92.8%

41.4%

Humanity's Last Exam

36.24%

81.2%

MMMU Pro

81.2%

74.0%

MRCR v2

36.6%

78.7%

OSWorld

75.0%

78.7%

OSWorld-Verified

75.0%

58.6%

SWE-bench Pro

57.7%

82.7%

Terminal-Bench 2.0

75.1%