benchlm.ai

Gemini 1.5 Pro vs GPT-OSS 20B

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

Quick Verdict

Gemini 1.5 Pro wins overall with a score of 54 vs 22 (32 point difference).Gemini 1.5 Pro wins 4 out of 4 categories.

Gemini 1.5 Pro

CreatorGoogle
TypeProprietary
Context2M
Score54

GPT-OSS 20B

CreatorOpenAI
TypeOpen Weight
Context128K
Score22

Knowledge

Gemini 1.5 Pro

Gemini 1.5 Pro

62.5

GPT-OSS 20B

28.8

64
MMLU
31
64
GPQA
30
62
SuperGPQA
28
60
OpenBookQA
26

Coding

Gemini 1.5 Pro

Gemini 1.5 Pro

56

GPT-OSS 20B

23

56
HumanEval
23

Mathematics

Gemini 1.5 Pro

Gemini 1.5 Pro

63

GPT-OSS 20B

30

64
AIME 2023
31
66
AIME 2024
33
65
AIME 2025
32
60
HMMT Feb 2023
27
62
HMMT Feb 2024
29
61
HMMT Feb 2025
28
63
BRUMO 2025
30

Reasoning

Gemini 1.5 Pro

Gemini 1.5 Pro

61

GPT-OSS 20B

28

62
SimpleQA
29
60
MuSR
27

Frequently Asked Questions

Which is better, Gemini 1.5 Pro or GPT-OSS 20B?

Gemini 1.5 Pro scores higher overall with 54 vs 22, a difference of 32 points across all benchmarks.

Which is better for knowledge tasks, Gemini 1.5 Pro or GPT-OSS 20B?

Gemini 1.5 Pro leads in knowledge tasks with an average score of 62.5 vs 28.8.

Which is better for coding, Gemini 1.5 Pro or GPT-OSS 20B?

Gemini 1.5 Pro leads in coding with an average score of 56 vs 23.

Which is better for math, Gemini 1.5 Pro or GPT-OSS 20B?

Gemini 1.5 Pro leads in math with an average score of 63 vs 30.

Which is better for reasoning, Gemini 1.5 Pro or GPT-OSS 20B?

Gemini 1.5 Pro leads in reasoning with an average score of 61 vs 28.

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