DeepSeekMath V2 vs GPT-OSS 20B

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

Quick Verdict

DeepSeekMath V2 wins overall with a score of 64 vs 22 (42 point difference).DeepSeekMath V2 wins 4 out of 4 categories.

Knowledge

DeepSeekMath V2

DeepSeekMath V2

77.8

GPT-OSS 20B

28.8

80
MMLU
31
79
GPQA
30
77
SuperGPQA
28
75
OpenBookQA
26

Coding

DeepSeekMath V2

DeepSeekMath V2

72

GPT-OSS 20B

23

72
HumanEval
23

Mathematics

DeepSeekMath V2

DeepSeekMath V2

79

GPT-OSS 20B

30

80
AIME 2023
31
82
AIME 2024
33
81
AIME 2025
32
76
HMMT Feb 2023
27
78
HMMT Feb 2024
29
77
HMMT Feb 2025
28
79
BRUMO 2025
30

Reasoning

DeepSeekMath V2

DeepSeekMath V2

76

GPT-OSS 20B

28

77
SimpleQA
29
75
MuSR
27

Frequently Asked Questions

Which is better, DeepSeekMath V2 or GPT-OSS 20B?

DeepSeekMath V2 scores higher overall with 64 vs 22, a difference of 42 points across all benchmarks.

Which is better for knowledge tasks, DeepSeekMath V2 or GPT-OSS 20B?

DeepSeekMath V2 leads in knowledge tasks with an average score of 77.8 vs 28.8.

Which is better for coding, DeepSeekMath V2 or GPT-OSS 20B?

DeepSeekMath V2 leads in coding with an average score of 72 vs 23.

Which is better for math, DeepSeekMath V2 or GPT-OSS 20B?

DeepSeekMath V2 leads in math with an average score of 79 vs 30.

Which is better for reasoning, DeepSeekMath V2 or GPT-OSS 20B?

DeepSeekMath V2 leads in reasoning with an average score of 76 vs 28.