benchlm.ai

Gemini 3.1 Pro vs GPT-OSS 120B

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

Quick Verdict

Gemini 3.1 Pro wins overall with a score of 87 vs 42 (45 point difference).Gemini 3.1 Pro wins 4 out of 4 categories.

Gemini 3.1 Pro

CreatorGoogle
TypeProprietary
Context1M
Score87

GPT-OSS 120B

CreatorOpenAI
TypeOpen Weight
Context128K
Score42

Knowledge

Gemini 3.1 Pro

Gemini 3.1 Pro

96

GPT-OSS 120B

48.8

99
MMLU
51
97
GPQA
50
95
SuperGPQA
48
93
OpenBookQA
46

Coding

Gemini 3.1 Pro

Gemini 3.1 Pro

91

GPT-OSS 120B

43

91
HumanEval
43

Mathematics

Gemini 3.1 Pro

Gemini 3.1 Pro

97.1

GPT-OSS 120B

50

99
AIME 2023
51
99
AIME 2024
53
98
AIME 2025
52
95
HMMT Feb 2023
47
97
HMMT Feb 2024
49
96
HMMT Feb 2025
48
96
BRUMO 2025
50

Reasoning

Gemini 3.1 Pro

Gemini 3.1 Pro

94

GPT-OSS 120B

48

95
SimpleQA
49
93
MuSR
47

Frequently Asked Questions

Which is better, Gemini 3.1 Pro or GPT-OSS 120B?

Gemini 3.1 Pro scores higher overall with 87 vs 42, a difference of 45 points across all benchmarks.

Which is better for knowledge tasks, Gemini 3.1 Pro or GPT-OSS 120B?

Gemini 3.1 Pro leads in knowledge tasks with an average score of 96 vs 48.8.

Which is better for coding, Gemini 3.1 Pro or GPT-OSS 120B?

Gemini 3.1 Pro leads in coding with an average score of 91 vs 43.

Which is better for math, Gemini 3.1 Pro or GPT-OSS 120B?

Gemini 3.1 Pro leads in math with an average score of 97.1 vs 50.

Which is better for reasoning, Gemini 3.1 Pro or GPT-OSS 120B?

Gemini 3.1 Pro leads in reasoning with an average score of 94 vs 48.

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