GPT-5.5 vs Kimi K2.5 — Who Actually Wins? Real Benchmark Data (2026)

head to head

GPT-5.5 vs Kimi K2.5

8 shared benchmarks

8

wins

0

ties

0

wins

84.4%

BrowseComp

60.6%

93.5%

GPQA Diamond

87.6%

41.4%

Humanity's Last Exam

24.37%

81.2%

MMMU Pro

78.5%

78.7%

OSWorld

63.3%

89.4%

OmniDocBench

89.33%

58.6%

SWE-bench Pro

50.7%

82.7%

Terminal-Bench 2.0

50.8%