GPT-5.5 vs GLM-5.2 — Who Actually Wins? Real Benchmark Data (2026)

head to head

GPT-5.5 vs GLM-5.2

18 shared benchmarks

13

wins

0

ties

5

wins

38.5%

APEX-Agents

35.6%

22.7%

AutomationBench

12.9%

67.0%

DeepSWE

44.0%

64.9%

FrontierSWE

67.3%

93.5%

GPQA Diamond

91.2%

41.4%

Humanity's Last Exam

40.5%

38.3%

JobBench

43.4%

82.8%

MCP-Atlas

76.8%

35.5%

MLS Bench

40.4%

60.9%

OfficeQA Pro

41.4%

28.4%

PostTrain Bench

34.3%

70.8%

Program Bench

63.7%

14.0%

SWE Marathon

13.0%

58.6%

SWE-bench Pro

62.1%

29.05%

SpreadsheetBench 2

28.12%

83.4%

Terminal-Bench 2.1

81.0%

55.6%

Toolathlon

48.2%

73.5%

Toolathlon-Verified

59.9%