GPT-OSS 120B vs Kimi K2

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

Quick Verdict

GPT-OSS 120B wins overall with a score of 42 vs 23 (19 point difference).GPT-OSS 120B wins 4 out of 4 categories.

Knowledge

GPT-OSS 120B

GPT-OSS 120B

48.8

Kimi K2

29.8

51
MMLU
32
50
GPQA
31
48
SuperGPQA
29
46
OpenBookQA
27

Coding

GPT-OSS 120B

GPT-OSS 120B

43

Kimi K2

24

43
HumanEval
24

Mathematics

GPT-OSS 120B

GPT-OSS 120B

50

Kimi K2

31

51
AIME 2023
32
53
AIME 2024
34
52
AIME 2025
33
47
HMMT Feb 2023
28
49
HMMT Feb 2024
30
48
HMMT Feb 2025
29
50
BRUMO 2025
31

Reasoning

GPT-OSS 120B

GPT-OSS 120B

48

Kimi K2

29

49
SimpleQA
30
47
MuSR
28

Frequently Asked Questions

Which is better, GPT-OSS 120B or Kimi K2?

GPT-OSS 120B scores higher overall with 42 vs 23, a difference of 19 points across all benchmarks.

Which is better for knowledge tasks, GPT-OSS 120B or Kimi K2?

GPT-OSS 120B leads in knowledge tasks with an average score of 48.8 vs 29.8.

Which is better for coding, GPT-OSS 120B or Kimi K2?

GPT-OSS 120B leads in coding with an average score of 43 vs 24.

Which is better for math, GPT-OSS 120B or Kimi K2?

GPT-OSS 120B leads in math with an average score of 50 vs 31.

Which is better for reasoning, GPT-OSS 120B or Kimi K2?

GPT-OSS 120B leads in reasoning with an average score of 48 vs 29.