GLM-4.5-Air vs GPT-OSS 120B

Side-by-side benchmark comparison across knowledge, coding, math, and reasoning.

Quick Verdict

GPT-OSS 120B wins overall with a score of 42 vs 26 (16 point difference).GPT-OSS 120B wins 4 out of 4 categories.

Knowledge

GPT-OSS 120B

GLM-4.5-Air

32.8

GPT-OSS 120B

48.8

35
MMLU
51
34
GPQA
50
32
SuperGPQA
48
30
OpenBookQA
46

Coding

GPT-OSS 120B

GLM-4.5-Air

27

GPT-OSS 120B

43

27
HumanEval
43

Mathematics

GPT-OSS 120B

GLM-4.5-Air

34

GPT-OSS 120B

50

35
AIME 2023
51
37
AIME 2024
53
36
AIME 2025
52
31
HMMT Feb 2023
47
33
HMMT Feb 2024
49
32
HMMT Feb 2025
48
34
BRUMO 2025
50

Reasoning

GPT-OSS 120B

GLM-4.5-Air

32

GPT-OSS 120B

48

33
SimpleQA
49
31
MuSR
47

Frequently Asked Questions

Which is better, GLM-4.5-Air or GPT-OSS 120B?

GPT-OSS 120B scores higher overall with 42 vs 26, a difference of 16 points across all benchmarks.

Which is better for knowledge tasks, GLM-4.5-Air or GPT-OSS 120B?

GPT-OSS 120B leads in knowledge tasks with an average score of 48.8 vs 32.8.

Which is better for coding, GLM-4.5-Air or GPT-OSS 120B?

GPT-OSS 120B leads in coding with an average score of 43 vs 27.

Which is better for math, GLM-4.5-Air or GPT-OSS 120B?

GPT-OSS 120B leads in math with an average score of 50 vs 34.

Which is better for reasoning, GLM-4.5-Air or GPT-OSS 120B?

GPT-OSS 120B leads in reasoning with an average score of 48 vs 32.