benchlm.ai

Gemini 3 Pro vs GPT-OSS 20B

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

Quick Verdict

Gemini 3 Pro wins overall with a score of 78 vs 22 (56 point difference).Gemini 3 Pro wins 4 out of 4 categories.

Gemini 3 Pro

CreatorGoogle
TypeProprietary
Context2M
Score78

GPT-OSS 20B

CreatorOpenAI
TypeOpen Weight
Context128K
Score22

Knowledge

Gemini 3 Pro

Gemini 3 Pro

96

GPT-OSS 20B

28.8

99
MMLU
31
97
GPQA
30
95
SuperGPQA
28
93
OpenBookQA
26

Coding

Gemini 3 Pro

Gemini 3 Pro

91

GPT-OSS 20B

23

91
HumanEval
23

Mathematics

Gemini 3 Pro

Gemini 3 Pro

97.1

GPT-OSS 20B

30

99
AIME 2023
31
99
AIME 2024
33
98
AIME 2025
32
95
HMMT Feb 2023
27
97
HMMT Feb 2024
29
96
HMMT Feb 2025
28
96
BRUMO 2025
30

Reasoning

Gemini 3 Pro

Gemini 3 Pro

94

GPT-OSS 20B

28

95
SimpleQA
29
93
MuSR
27

Frequently Asked Questions

Which is better, Gemini 3 Pro or GPT-OSS 20B?

Gemini 3 Pro scores higher overall with 78 vs 22, a difference of 56 points across all benchmarks.

Which is better for knowledge tasks, Gemini 3 Pro or GPT-OSS 20B?

Gemini 3 Pro leads in knowledge tasks with an average score of 96 vs 28.8.

Which is better for coding, Gemini 3 Pro or GPT-OSS 20B?

Gemini 3 Pro leads in coding with an average score of 91 vs 23.

Which is better for math, Gemini 3 Pro or GPT-OSS 20B?

Gemini 3 Pro leads in math with an average score of 97.1 vs 30.

Which is better for reasoning, Gemini 3 Pro or GPT-OSS 20B?

Gemini 3 Pro leads in reasoning with an average score of 94 vs 28.

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