benchlm.ai

GPT-OSS 120B 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 42 (31 point difference).Grok 4.1 Fast wins 4 out of 4 categories.

GPT-OSS 120B

CreatorOpenAI
TypeOpen Weight
Context128K
Score42

Grok 4.1 Fast

CreatorxAI
TypeProprietary
Context2M
Score73

Knowledge

Grok 4.1 Fast

GPT-OSS 120B

48.8

Grok 4.1 Fast

91

51
MMLU
94
50
GPQA
92
48
SuperGPQA
90
46
OpenBookQA
88

Coding

Grok 4.1 Fast

GPT-OSS 120B

43

Grok 4.1 Fast

86

43
HumanEval
86

Mathematics

Grok 4.1 Fast

GPT-OSS 120B

50

Grok 4.1 Fast

95

51
AIME 2023
96
53
AIME 2024
98
52
AIME 2025
97
47
HMMT Feb 2023
92
49
HMMT Feb 2024
94
48
HMMT Feb 2025
93
50
BRUMO 2025
95

Reasoning

Grok 4.1 Fast

GPT-OSS 120B

48

Grok 4.1 Fast

89

49
SimpleQA
90
47
MuSR
88

Frequently Asked Questions

Which is better, GPT-OSS 120B or Grok 4.1 Fast?

Grok 4.1 Fast scores higher overall with 73 vs 42, a difference of 31 points across all benchmarks.

Which is better for knowledge tasks, GPT-OSS 120B or Grok 4.1 Fast?

Grok 4.1 Fast leads in knowledge tasks with an average score of 91 vs 48.8.

Which is better for coding, GPT-OSS 120B or Grok 4.1 Fast?

Grok 4.1 Fast leads in coding with an average score of 86 vs 43.

Which is better for math, GPT-OSS 120B or Grok 4.1 Fast?

Grok 4.1 Fast leads in math with an average score of 95 vs 50.

Which is better for reasoning, GPT-OSS 120B or Grok 4.1 Fast?

Grok 4.1 Fast leads in reasoning with an average score of 89 vs 48.

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