benchlm.ai

Claude 3.5 Sonnet vs GPT-OSS 120B

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

Quick Verdict

Claude 3.5 Sonnet wins overall with a score of 55 vs 42 (13 point difference).Claude 3.5 Sonnet wins 4 out of 4 categories.

Claude 3.5 Sonnet

CreatorAnthropic
TypeProprietary
Context200K
Score55

GPT-OSS 120B

CreatorOpenAI
TypeOpen Weight
Context128K
Score42

Knowledge

Claude 3.5 Sonnet

Claude 3.5 Sonnet

63.5

GPT-OSS 120B

48.8

65
MMLU
51
65
GPQA
50
63
SuperGPQA
48
61
OpenBookQA
46

Coding

Claude 3.5 Sonnet

Claude 3.5 Sonnet

57

GPT-OSS 120B

43

57
HumanEval
43

Mathematics

Claude 3.5 Sonnet

Claude 3.5 Sonnet

64

GPT-OSS 120B

50

65
AIME 2023
51
67
AIME 2024
53
66
AIME 2025
52
61
HMMT Feb 2023
47
63
HMMT Feb 2024
49
62
HMMT Feb 2025
48
64
BRUMO 2025
50

Reasoning

Claude 3.5 Sonnet

Claude 3.5 Sonnet

62

GPT-OSS 120B

48

63
SimpleQA
49
61
MuSR
47

Frequently Asked Questions

Which is better, Claude 3.5 Sonnet or GPT-OSS 120B?

Claude 3.5 Sonnet scores higher overall with 55 vs 42, a difference of 13 points across all benchmarks.

Which is better for knowledge tasks, Claude 3.5 Sonnet or GPT-OSS 120B?

Claude 3.5 Sonnet leads in knowledge tasks with an average score of 63.5 vs 48.8.

Which is better for coding, Claude 3.5 Sonnet or GPT-OSS 120B?

Claude 3.5 Sonnet leads in coding with an average score of 57 vs 43.

Which is better for math, Claude 3.5 Sonnet or GPT-OSS 120B?

Claude 3.5 Sonnet leads in math with an average score of 64 vs 50.

Which is better for reasoning, Claude 3.5 Sonnet or GPT-OSS 120B?

Claude 3.5 Sonnet leads in reasoning with an average score of 62 vs 48.

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