GLM-4.5 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 28 (14 point difference).GPT-OSS 120B wins 4 out of 4 categories.

Knowledge

GPT-OSS 120B

GLM-4.5

34.8

GPT-OSS 120B

48.8

37
MMLU
51
36
GPQA
50
34
SuperGPQA
48
32
OpenBookQA
46

Coding

GPT-OSS 120B

GLM-4.5

29

GPT-OSS 120B

43

29
HumanEval
43

Mathematics

GPT-OSS 120B

GLM-4.5

36

GPT-OSS 120B

50

37
AIME 2023
51
39
AIME 2024
53
38
AIME 2025
52
33
HMMT Feb 2023
47
35
HMMT Feb 2024
49
34
HMMT Feb 2025
48
36
BRUMO 2025
50

Reasoning

GPT-OSS 120B

GLM-4.5

34

GPT-OSS 120B

48

35
SimpleQA
49
33
MuSR
47

Frequently Asked Questions

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

GPT-OSS 120B scores higher overall with 42 vs 28, a difference of 14 points across all benchmarks.

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

GPT-OSS 120B leads in knowledge tasks with an average score of 48.8 vs 34.8.

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

GPT-OSS 120B leads in coding with an average score of 43 vs 29.

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

GPT-OSS 120B leads in math with an average score of 50 vs 36.

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

GPT-OSS 120B leads in reasoning with an average score of 48 vs 34.