benchlm.ai

GPT-OSS 120B vs Kimi K2.5

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

Quick Verdict

Kimi K2.5 wins overall with a score of 62 vs 42 (20 point difference).Kimi K2.5 wins 4 out of 4 categories.

GPT-OSS 120B

CreatorOpenAI
TypeOpen Weight
Context128K
Score42

Kimi K2.5

CreatorMoonshot AI
TypeOpen Weight
Context128K
Score62

Knowledge

Kimi K2.5

GPT-OSS 120B

48.8

Kimi K2.5

74.8

51
MMLU
77
50
GPQA
76
48
SuperGPQA
74
46
OpenBookQA
72

Coding

Kimi K2.5

GPT-OSS 120B

43

Kimi K2.5

69

43
HumanEval
69

Mathematics

Kimi K2.5

GPT-OSS 120B

50

Kimi K2.5

76

51
AIME 2023
77
53
AIME 2024
79
52
AIME 2025
78
47
HMMT Feb 2023
73
49
HMMT Feb 2024
75
48
HMMT Feb 2025
74
50
BRUMO 2025
76

Reasoning

Kimi K2.5

GPT-OSS 120B

48

Kimi K2.5

73

49
SimpleQA
74
47
MuSR
72

Frequently Asked Questions

Which is better, GPT-OSS 120B or Kimi K2.5?

Kimi K2.5 scores higher overall with 62 vs 42, a difference of 20 points across all benchmarks.

Which is better for knowledge tasks, GPT-OSS 120B or Kimi K2.5?

Kimi K2.5 leads in knowledge tasks with an average score of 74.8 vs 48.8.

Which is better for coding, GPT-OSS 120B or Kimi K2.5?

Kimi K2.5 leads in coding with an average score of 69 vs 43.

Which is better for math, GPT-OSS 120B or Kimi K2.5?

Kimi K2.5 leads in math with an average score of 76 vs 50.

Which is better for reasoning, GPT-OSS 120B or Kimi K2.5?

Kimi K2.5 leads in reasoning with an average score of 73 vs 48.

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