benchlm.ai

Claude 4.1 Opus Thinking 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 29 (13 point difference).GPT-OSS 120B wins 4 out of 4 categories.

Claude 4.1 Opus Thinking

CreatorAnthropic
TypeProprietary
Context200K
Score29

GPT-OSS 120B

CreatorOpenAI
TypeOpen Weight
Context128K
Score42

Knowledge

GPT-OSS 120B

Claude 4.1 Opus Thinking

35.8

GPT-OSS 120B

48.8

38
MMLU
51
37
GPQA
50
35
SuperGPQA
48
33
OpenBookQA
46

Coding

GPT-OSS 120B

Claude 4.1 Opus Thinking

30

GPT-OSS 120B

43

30
HumanEval
43

Mathematics

GPT-OSS 120B

Claude 4.1 Opus Thinking

37

GPT-OSS 120B

50

38
AIME 2023
51
40
AIME 2024
53
39
AIME 2025
52
34
HMMT Feb 2023
47
36
HMMT Feb 2024
49
35
HMMT Feb 2025
48
37
BRUMO 2025
50

Reasoning

GPT-OSS 120B

Claude 4.1 Opus Thinking

35

GPT-OSS 120B

48

36
SimpleQA
49
34
MuSR
47

Frequently Asked Questions

Which is better, Claude 4.1 Opus Thinking or GPT-OSS 120B?

GPT-OSS 120B scores higher overall with 42 vs 29, a difference of 13 points across all benchmarks.

Which is better for knowledge tasks, Claude 4.1 Opus Thinking or GPT-OSS 120B?

GPT-OSS 120B leads in knowledge tasks with an average score of 48.8 vs 35.8.

Which is better for coding, Claude 4.1 Opus Thinking or GPT-OSS 120B?

GPT-OSS 120B leads in coding with an average score of 43 vs 30.

Which is better for math, Claude 4.1 Opus Thinking or GPT-OSS 120B?

GPT-OSS 120B leads in math with an average score of 50 vs 37.

Which is better for reasoning, Claude 4.1 Opus Thinking or GPT-OSS 120B?

GPT-OSS 120B leads in reasoning with an average score of 48 vs 35.

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