benchlm.ai

Gemini 3 Pro Deep Think vs GPT-OSS 20B

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

Quick Verdict

Gemini 3 Pro Deep Think wins overall with a score of 81 vs 22 (59 point difference).Gemini 3 Pro Deep Think wins 4 out of 4 categories.

Gemini 3 Pro Deep Think

CreatorGoogle
TypeProprietary
Context2M
Score81

GPT-OSS 20B

CreatorOpenAI
TypeOpen Weight
Context128K
Score22

Knowledge

Gemini 3 Pro Deep Think

Gemini 3 Pro Deep Think

96

GPT-OSS 20B

28.8

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

Coding

Gemini 3 Pro Deep Think

Gemini 3 Pro Deep Think

91

GPT-OSS 20B

23

91
HumanEval
23

Mathematics

Gemini 3 Pro Deep Think

Gemini 3 Pro Deep Think

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 Deep Think

Gemini 3 Pro Deep Think

94

GPT-OSS 20B

28

95
SimpleQA
29
93
MuSR
27

Frequently Asked Questions

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

Gemini 3 Pro Deep Think scores higher overall with 81 vs 22, a difference of 59 points across all benchmarks.

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

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

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

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

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

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

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

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

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