benchlm.ai

GPT-OSS 20B vs Grok 4.1 Fast

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

Quick Verdict

Grok 4.1 Fast wins overall with a score of 73 vs 22 (51 point difference).Grok 4.1 Fast wins 4 out of 4 categories.

GPT-OSS 20B

CreatorOpenAI
TypeOpen Weight
Context128K
Score22

Grok 4.1 Fast

CreatorxAI
TypeProprietary
Context2M
Score73

Knowledge

Grok 4.1 Fast

GPT-OSS 20B

28.8

Grok 4.1 Fast

91

31
MMLU
94
30
GPQA
92
28
SuperGPQA
90
26
OpenBookQA
88

Coding

Grok 4.1 Fast

GPT-OSS 20B

23

Grok 4.1 Fast

86

23
HumanEval
86

Mathematics

Grok 4.1 Fast

GPT-OSS 20B

30

Grok 4.1 Fast

95

31
AIME 2023
96
33
AIME 2024
98
32
AIME 2025
97
27
HMMT Feb 2023
92
29
HMMT Feb 2024
94
28
HMMT Feb 2025
93
30
BRUMO 2025
95

Reasoning

Grok 4.1 Fast

GPT-OSS 20B

28

Grok 4.1 Fast

89

29
SimpleQA
90
27
MuSR
88

Frequently Asked Questions

Which is better, GPT-OSS 20B or Grok 4.1 Fast?

Grok 4.1 Fast scores higher overall with 73 vs 22, a difference of 51 points across all benchmarks.

Which is better for knowledge tasks, GPT-OSS 20B or Grok 4.1 Fast?

Grok 4.1 Fast leads in knowledge tasks with an average score of 91 vs 28.8.

Which is better for coding, GPT-OSS 20B or Grok 4.1 Fast?

Grok 4.1 Fast leads in coding with an average score of 86 vs 23.

Which is better for math, GPT-OSS 20B or Grok 4.1 Fast?

Grok 4.1 Fast leads in math with an average score of 95 vs 30.

Which is better for reasoning, GPT-OSS 20B or Grok 4.1 Fast?

Grok 4.1 Fast leads in reasoning with an average score of 89 vs 28.

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