GLM-5 vs GPT-OSS 20B

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

Quick Verdict

GLM-5 wins overall with a score of 68 vs 22 (46 point difference).GLM-5 wins 4 out of 4 categories.

Knowledge

GLM-5

GLM-5

85

GPT-OSS 20B

28.8

88
MMLU
31
86
GPQA
30
84
SuperGPQA
28
82
OpenBookQA
26

Coding

GLM-5

GLM-5

80

GPT-OSS 20B

23

80
HumanEval
23

Mathematics

GLM-5

GLM-5

87

GPT-OSS 20B

30

88
AIME 2023
31
90
AIME 2024
33
89
AIME 2025
32
84
HMMT Feb 2023
27
86
HMMT Feb 2024
29
85
HMMT Feb 2025
28
87
BRUMO 2025
30

Reasoning

GLM-5

GLM-5

83

GPT-OSS 20B

28

84
SimpleQA
29
82
MuSR
27

Frequently Asked Questions

Which is better, GLM-5 or GPT-OSS 20B?

GLM-5 scores higher overall with 68 vs 22, a difference of 46 points across all benchmarks.

Which is better for knowledge tasks, GLM-5 or GPT-OSS 20B?

GLM-5 leads in knowledge tasks with an average score of 85 vs 28.8.

Which is better for coding, GLM-5 or GPT-OSS 20B?

GLM-5 leads in coding with an average score of 80 vs 23.

Which is better for math, GLM-5 or GPT-OSS 20B?

GLM-5 leads in math with an average score of 87 vs 30.

Which is better for reasoning, GLM-5 or GPT-OSS 20B?

GLM-5 leads in reasoning with an average score of 83 vs 28.