DeepSeek V3.1 (Reasoning) vs GPT-OSS 20B

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

Quick Verdict

DeepSeek V3.1 (Reasoning) wins overall with a score of 25 vs 22 (3 point difference).DeepSeek V3.1 (Reasoning) wins 4 out of 4 categories.

Knowledge

DeepSeek V3.1 (Reasoning)

DeepSeek V3.1 (Reasoning)

31.8

GPT-OSS 20B

28.8

34
MMLU
31
33
GPQA
30
31
SuperGPQA
28
29
OpenBookQA
26

Coding

DeepSeek V3.1 (Reasoning)

DeepSeek V3.1 (Reasoning)

26

GPT-OSS 20B

23

26
HumanEval
23

Mathematics

DeepSeek V3.1 (Reasoning)

DeepSeek V3.1 (Reasoning)

33

GPT-OSS 20B

30

34
AIME 2023
31
36
AIME 2024
33
35
AIME 2025
32
30
HMMT Feb 2023
27
32
HMMT Feb 2024
29
31
HMMT Feb 2025
28
33
BRUMO 2025
30

Reasoning

DeepSeek V3.1 (Reasoning)

DeepSeek V3.1 (Reasoning)

31

GPT-OSS 20B

28

32
SimpleQA
29
30
MuSR
27

Frequently Asked Questions

Which is better, DeepSeek V3.1 (Reasoning) or GPT-OSS 20B?

DeepSeek V3.1 (Reasoning) scores higher overall with 25 vs 22, a difference of 3 points across all benchmarks.

Which is better for knowledge tasks, DeepSeek V3.1 (Reasoning) or GPT-OSS 20B?

DeepSeek V3.1 (Reasoning) leads in knowledge tasks with an average score of 31.8 vs 28.8.

Which is better for coding, DeepSeek V3.1 (Reasoning) or GPT-OSS 20B?

DeepSeek V3.1 (Reasoning) leads in coding with an average score of 26 vs 23.

Which is better for math, DeepSeek V3.1 (Reasoning) or GPT-OSS 20B?

DeepSeek V3.1 (Reasoning) leads in math with an average score of 33 vs 30.

Which is better for reasoning, DeepSeek V3.1 (Reasoning) or GPT-OSS 20B?

DeepSeek V3.1 (Reasoning) leads in reasoning with an average score of 31 vs 28.