DeepSeek Coder 2.0 vs GPT-OSS 20B

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

Quick Verdict

DeepSeek Coder 2.0 wins overall with a score of 64 vs 22 (42 point difference).DeepSeek Coder 2.0 wins 4 out of 4 categories.

Knowledge

DeepSeek Coder 2.0

DeepSeek Coder 2.0

77.8

GPT-OSS 20B

28.8

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

Coding

DeepSeek Coder 2.0

DeepSeek Coder 2.0

82

GPT-OSS 20B

23

82
HumanEval
23

Mathematics

DeepSeek Coder 2.0

DeepSeek Coder 2.0

80

GPT-OSS 20B

30

81
AIME 2023
31
83
AIME 2024
33
82
AIME 2025
32
77
HMMT Feb 2023
27
79
HMMT Feb 2024
29
78
HMMT Feb 2025
28
80
BRUMO 2025
30

Reasoning

DeepSeek Coder 2.0

DeepSeek Coder 2.0

77

GPT-OSS 20B

28

78
SimpleQA
29
76
MuSR
27

Frequently Asked Questions

Which is better, DeepSeek Coder 2.0 or GPT-OSS 20B?

DeepSeek Coder 2.0 scores higher overall with 64 vs 22, a difference of 42 points across all benchmarks.

Which is better for knowledge tasks, DeepSeek Coder 2.0 or GPT-OSS 20B?

DeepSeek Coder 2.0 leads in knowledge tasks with an average score of 77.8 vs 28.8.

Which is better for coding, DeepSeek Coder 2.0 or GPT-OSS 20B?

DeepSeek Coder 2.0 leads in coding with an average score of 82 vs 23.

Which is better for math, DeepSeek Coder 2.0 or GPT-OSS 20B?

DeepSeek Coder 2.0 leads in math with an average score of 80 vs 30.

Which is better for reasoning, DeepSeek Coder 2.0 or GPT-OSS 20B?

DeepSeek Coder 2.0 leads in reasoning with an average score of 77 vs 28.