Gemma 3 27B vs GPT-OSS 20B

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

Quick Verdict

Gemma 3 27B wins overall with a score of 36 vs 22 (14 point difference).Gemma 3 27B wins 4 out of 4 categories.

Knowledge

Gemma 3 27B

Gemma 3 27B

42.8

GPT-OSS 20B

28.8

45
MMLU
31
44
GPQA
30
42
SuperGPQA
28
40
OpenBookQA
26

Coding

Gemma 3 27B

Gemma 3 27B

37

GPT-OSS 20B

23

37
HumanEval
23

Mathematics

Gemma 3 27B

Gemma 3 27B

44

GPT-OSS 20B

30

45
AIME 2023
31
47
AIME 2024
33
46
AIME 2025
32
41
HMMT Feb 2023
27
43
HMMT Feb 2024
29
42
HMMT Feb 2025
28
44
BRUMO 2025
30

Reasoning

Gemma 3 27B

Gemma 3 27B

42

GPT-OSS 20B

28

43
SimpleQA
29
41
MuSR
27

Frequently Asked Questions

Which is better, Gemma 3 27B or GPT-OSS 20B?

Gemma 3 27B scores higher overall with 36 vs 22, a difference of 14 points across all benchmarks.

Which is better for knowledge tasks, Gemma 3 27B or GPT-OSS 20B?

Gemma 3 27B leads in knowledge tasks with an average score of 42.8 vs 28.8.

Which is better for coding, Gemma 3 27B or GPT-OSS 20B?

Gemma 3 27B leads in coding with an average score of 37 vs 23.

Which is better for math, Gemma 3 27B or GPT-OSS 20B?

Gemma 3 27B leads in math with an average score of 44 vs 30.

Which is better for reasoning, Gemma 3 27B or GPT-OSS 20B?

Gemma 3 27B leads in reasoning with an average score of 42 vs 28.