benchlm.ai

Claude 4.1 Opus vs GPT-OSS 20B

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

Quick Verdict

Claude 4.1 Opus wins overall with a score of 61 vs 22 (39 point difference).Claude 4.1 Opus wins 4 out of 4 categories.

Claude 4.1 Opus

CreatorAnthropic
TypeProprietary
Context200K
Score61

GPT-OSS 20B

CreatorOpenAI
TypeOpen Weight
Context128K
Score22

Knowledge

Claude 4.1 Opus

Claude 4.1 Opus

74.5

GPT-OSS 20B

28.8

76
MMLU
31
76
GPQA
30
74
SuperGPQA
28
72
OpenBookQA
26

Coding

Claude 4.1 Opus

Claude 4.1 Opus

68

GPT-OSS 20B

23

68
HumanEval
23

Mathematics

Claude 4.1 Opus

Claude 4.1 Opus

75

GPT-OSS 20B

30

76
AIME 2023
31
78
AIME 2024
33
77
AIME 2025
32
72
HMMT Feb 2023
27
74
HMMT Feb 2024
29
73
HMMT Feb 2025
28
75
BRUMO 2025
30

Reasoning

Claude 4.1 Opus

Claude 4.1 Opus

73

GPT-OSS 20B

28

74
SimpleQA
29
72
MuSR
27

Frequently Asked Questions

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

Claude 4.1 Opus scores higher overall with 61 vs 22, a difference of 39 points across all benchmarks.

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

Claude 4.1 Opus leads in knowledge tasks with an average score of 74.5 vs 28.8.

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

Claude 4.1 Opus leads in coding with an average score of 68 vs 23.

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

Claude 4.1 Opus leads in math with an average score of 75 vs 30.

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

Claude 4.1 Opus leads in reasoning with an average score of 73 vs 28.

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