DeepSeek V3.1 vs GPT-OSS 120B

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

Quick Verdict

GPT-OSS 120B wins overall with a score of 42 vs 24 (18 point difference).GPT-OSS 120B wins 4 out of 4 categories.

Knowledge

GPT-OSS 120B

DeepSeek V3.1

30.8

GPT-OSS 120B

48.8

33
MMLU
51
32
GPQA
50
30
SuperGPQA
48
28
OpenBookQA
46

Coding

GPT-OSS 120B

DeepSeek V3.1

25

GPT-OSS 120B

43

25
HumanEval
43

Mathematics

GPT-OSS 120B

DeepSeek V3.1

32

GPT-OSS 120B

50

33
AIME 2023
51
35
AIME 2024
53
34
AIME 2025
52
29
HMMT Feb 2023
47
31
HMMT Feb 2024
49
30
HMMT Feb 2025
48
32
BRUMO 2025
50

Reasoning

GPT-OSS 120B

DeepSeek V3.1

30

GPT-OSS 120B

48

31
SimpleQA
49
29
MuSR
47

Frequently Asked Questions

Which is better, DeepSeek V3.1 or GPT-OSS 120B?

GPT-OSS 120B scores higher overall with 42 vs 24, a difference of 18 points across all benchmarks.

Which is better for knowledge tasks, DeepSeek V3.1 or GPT-OSS 120B?

GPT-OSS 120B leads in knowledge tasks with an average score of 48.8 vs 30.8.

Which is better for coding, DeepSeek V3.1 or GPT-OSS 120B?

GPT-OSS 120B leads in coding with an average score of 43 vs 25.

Which is better for math, DeepSeek V3.1 or GPT-OSS 120B?

GPT-OSS 120B leads in math with an average score of 50 vs 32.

Which is better for reasoning, DeepSeek V3.1 or GPT-OSS 120B?

GPT-OSS 120B leads in reasoning with an average score of 48 vs 30.