benchlm.ai

Gemini 2.5 Pro vs GPT-OSS 20B

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

Quick Verdict

Gemini 2.5 Pro wins overall with a score of 65 vs 22 (43 point difference).Gemini 2.5 Pro wins 4 out of 4 categories.

Gemini 2.5 Pro

CreatorGoogle
TypeProprietary
Context2M
Score65

GPT-OSS 20B

CreatorOpenAI
TypeOpen Weight
Context128K
Score22

Knowledge

Gemini 2.5 Pro

Gemini 2.5 Pro

81.5

GPT-OSS 20B

28.8

83
MMLU
31
83
GPQA
30
81
SuperGPQA
28
79
OpenBookQA
26

Coding

Gemini 2.5 Pro

Gemini 2.5 Pro

75

GPT-OSS 20B

23

75
HumanEval
23

Mathematics

Gemini 2.5 Pro

Gemini 2.5 Pro

83

GPT-OSS 20B

30

84
AIME 2023
31
86
AIME 2024
33
85
AIME 2025
32
80
HMMT Feb 2023
27
82
HMMT Feb 2024
29
81
HMMT Feb 2025
28
83
BRUMO 2025
30

Reasoning

Gemini 2.5 Pro

Gemini 2.5 Pro

80

GPT-OSS 20B

28

81
SimpleQA
29
79
MuSR
27

Frequently Asked Questions

Which is better, Gemini 2.5 Pro or GPT-OSS 20B?

Gemini 2.5 Pro scores higher overall with 65 vs 22, a difference of 43 points across all benchmarks.

Which is better for knowledge tasks, Gemini 2.5 Pro or GPT-OSS 20B?

Gemini 2.5 Pro leads in knowledge tasks with an average score of 81.5 vs 28.8.

Which is better for coding, Gemini 2.5 Pro or GPT-OSS 20B?

Gemini 2.5 Pro leads in coding with an average score of 75 vs 23.

Which is better for math, Gemini 2.5 Pro or GPT-OSS 20B?

Gemini 2.5 Pro leads in math with an average score of 83 vs 30.

Which is better for reasoning, Gemini 2.5 Pro or GPT-OSS 20B?

Gemini 2.5 Pro leads in reasoning with an average score of 80 vs 28.

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