GPT-OSS 20B vs Moonshot v1

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

Quick Verdict

Moonshot v1 wins overall with a score of 44 vs 22 (22 point difference).Moonshot v1 wins 4 out of 4 categories.

Knowledge

Moonshot v1

GPT-OSS 20B

28.8

Moonshot v1

50.8

31
MMLU
53
30
GPQA
52
28
SuperGPQA
50
26
OpenBookQA
48

Coding

Moonshot v1

GPT-OSS 20B

23

Moonshot v1

45

23
HumanEval
45

Mathematics

Moonshot v1

GPT-OSS 20B

30

Moonshot v1

52

31
AIME 2023
53
33
AIME 2024
55
32
AIME 2025
54
27
HMMT Feb 2023
49
29
HMMT Feb 2024
51
28
HMMT Feb 2025
50
30
BRUMO 2025
52

Reasoning

Moonshot v1

GPT-OSS 20B

28

Moonshot v1

50

29
SimpleQA
51
27
MuSR
49

Frequently Asked Questions

Which is better, GPT-OSS 20B or Moonshot v1?

Moonshot v1 scores higher overall with 44 vs 22, a difference of 22 points across all benchmarks.

Which is better for knowledge tasks, GPT-OSS 20B or Moonshot v1?

Moonshot v1 leads in knowledge tasks with an average score of 50.8 vs 28.8.

Which is better for coding, GPT-OSS 20B or Moonshot v1?

Moonshot v1 leads in coding with an average score of 45 vs 23.

Which is better for math, GPT-OSS 20B or Moonshot v1?

Moonshot v1 leads in math with an average score of 52 vs 30.

Which is better for reasoning, GPT-OSS 20B or Moonshot v1?

Moonshot v1 leads in reasoning with an average score of 50 vs 28.