Claude 4 Sonnet vs GPT-OSS 120B

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

Quick Verdict

Claude 4 Sonnet wins overall with a score of 59 vs 42 (17 point difference).Claude 4 Sonnet wins 4 out of 4 categories.

Knowledge

Claude 4 Sonnet

Claude 4 Sonnet

71.5

GPT-OSS 120B

48.8

73
MMLU
51
73
GPQA
50
71
SuperGPQA
48
69
OpenBookQA
46

Coding

Claude 4 Sonnet

Claude 4 Sonnet

65

GPT-OSS 120B

43

65
HumanEval
43

Mathematics

Claude 4 Sonnet

Claude 4 Sonnet

72

GPT-OSS 120B

50

73
AIME 2023
51
75
AIME 2024
53
74
AIME 2025
52
69
HMMT Feb 2023
47
71
HMMT Feb 2024
49
70
HMMT Feb 2025
48
72
BRUMO 2025
50

Reasoning

Claude 4 Sonnet

Claude 4 Sonnet

70

GPT-OSS 120B

48

71
SimpleQA
49
69
MuSR
47

Frequently Asked Questions

Which is better, Claude 4 Sonnet or GPT-OSS 120B?

Claude 4 Sonnet scores higher overall with 59 vs 42, a difference of 17 points across all benchmarks.

Which is better for knowledge tasks, Claude 4 Sonnet or GPT-OSS 120B?

Claude 4 Sonnet leads in knowledge tasks with an average score of 71.5 vs 48.8.

Which is better for coding, Claude 4 Sonnet or GPT-OSS 120B?

Claude 4 Sonnet leads in coding with an average score of 65 vs 43.

Which is better for math, Claude 4 Sonnet or GPT-OSS 120B?

Claude 4 Sonnet leads in math with an average score of 72 vs 50.

Which is better for reasoning, Claude 4 Sonnet or GPT-OSS 120B?

Claude 4 Sonnet leads in reasoning with an average score of 70 vs 48.