benchlm.ai

Claude 4.1 Opus Thinking vs GPT-OSS 20B

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

Quick Verdict

Claude 4.1 Opus Thinking wins overall with a score of 29 vs 22 (7 point difference).Claude 4.1 Opus Thinking wins 4 out of 4 categories.

Claude 4.1 Opus Thinking

CreatorAnthropic
TypeProprietary
Context200K
Score29

GPT-OSS 20B

CreatorOpenAI
TypeOpen Weight
Context128K
Score22

Knowledge

Claude 4.1 Opus Thinking

Claude 4.1 Opus Thinking

35.8

GPT-OSS 20B

28.8

38
MMLU
31
37
GPQA
30
35
SuperGPQA
28
33
OpenBookQA
26

Coding

Claude 4.1 Opus Thinking

Claude 4.1 Opus Thinking

30

GPT-OSS 20B

23

30
HumanEval
23

Mathematics

Claude 4.1 Opus Thinking

Claude 4.1 Opus Thinking

37

GPT-OSS 20B

30

38
AIME 2023
31
40
AIME 2024
33
39
AIME 2025
32
34
HMMT Feb 2023
27
36
HMMT Feb 2024
29
35
HMMT Feb 2025
28
37
BRUMO 2025
30

Reasoning

Claude 4.1 Opus Thinking

Claude 4.1 Opus Thinking

35

GPT-OSS 20B

28

36
SimpleQA
29
34
MuSR
27

Frequently Asked Questions

Which is better, Claude 4.1 Opus Thinking or GPT-OSS 20B?

Claude 4.1 Opus Thinking scores higher overall with 29 vs 22, a difference of 7 points across all benchmarks.

Which is better for knowledge tasks, Claude 4.1 Opus Thinking or GPT-OSS 20B?

Claude 4.1 Opus Thinking leads in knowledge tasks with an average score of 35.8 vs 28.8.

Which is better for coding, Claude 4.1 Opus Thinking or GPT-OSS 20B?

Claude 4.1 Opus Thinking leads in coding with an average score of 30 vs 23.

Which is better for math, Claude 4.1 Opus Thinking or GPT-OSS 20B?

Claude 4.1 Opus Thinking leads in math with an average score of 37 vs 30.

Which is better for reasoning, Claude 4.1 Opus Thinking or GPT-OSS 20B?

Claude 4.1 Opus Thinking leads in reasoning with an average score of 35 vs 28.

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