benchlm.ai

Claude Sonnet 4.6 vs GPT-OSS 120B

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

Quick Verdict

Claude Sonnet 4.6 wins overall with a score of 80 vs 42 (38 point difference).Claude Sonnet 4.6 wins 4 out of 4 categories.

Claude Sonnet 4.6

CreatorAnthropic
TypeProprietary
Context1M
Score80

GPT-OSS 120B

CreatorOpenAI
TypeOpen Weight
Context128K
Score42

Knowledge

Claude Sonnet 4.6

Claude Sonnet 4.6

96

GPT-OSS 120B

48.8

99
MMLU
51
97
GPQA
50
95
SuperGPQA
48
93
OpenBookQA
46

Coding

Claude Sonnet 4.6

Claude Sonnet 4.6

93

GPT-OSS 120B

43

93
HumanEval
43

Mathematics

Claude Sonnet 4.6

Claude Sonnet 4.6

97.1

GPT-OSS 120B

50

99
AIME 2023
51
99
AIME 2024
53
98
AIME 2025
52
95
HMMT Feb 2023
47
97
HMMT Feb 2024
49
96
HMMT Feb 2025
48
96
BRUMO 2025
50

Reasoning

Claude Sonnet 4.6

Claude Sonnet 4.6

94

GPT-OSS 120B

48

95
SimpleQA
49
93
MuSR
47

Frequently Asked Questions

Which is better, Claude Sonnet 4.6 or GPT-OSS 120B?

Claude Sonnet 4.6 scores higher overall with 80 vs 42, a difference of 38 points across all benchmarks.

Which is better for knowledge tasks, Claude Sonnet 4.6 or GPT-OSS 120B?

Claude Sonnet 4.6 leads in knowledge tasks with an average score of 96 vs 48.8.

Which is better for coding, Claude Sonnet 4.6 or GPT-OSS 120B?

Claude Sonnet 4.6 leads in coding with an average score of 93 vs 43.

Which is better for math, Claude Sonnet 4.6 or GPT-OSS 120B?

Claude Sonnet 4.6 leads in math with an average score of 97.1 vs 50.

Which is better for reasoning, Claude Sonnet 4.6 or GPT-OSS 120B?

Claude Sonnet 4.6 leads in reasoning with an average score of 94 vs 48.

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