benchlm.ai

GPT-5.2-Codex vs Kimi K2.5

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

Quick Verdict

GPT-5.2-Codex wins overall with a score of 82 vs 62 (20 point difference).GPT-5.2-Codex wins 4 out of 4 categories.

GPT-5.2-Codex

CreatorOpenAI
TypeProprietary
Context400K
Score82

Kimi K2.5

CreatorMoonshot AI
TypeOpen Weight
Context128K
Score62

Knowledge

GPT-5.2-Codex

GPT-5.2-Codex

96

Kimi K2.5

74.8

99
MMLU
77
97
GPQA
76
95
SuperGPQA
74
93
OpenBookQA
72

Coding

GPT-5.2-Codex

GPT-5.2-Codex

95

Kimi K2.5

69

95
HumanEval
69

Mathematics

GPT-5.2-Codex

GPT-5.2-Codex

97.1

Kimi K2.5

76

99
AIME 2023
77
99
AIME 2024
79
98
AIME 2025
78
95
HMMT Feb 2023
73
97
HMMT Feb 2024
75
96
HMMT Feb 2025
74
96
BRUMO 2025
76

Reasoning

GPT-5.2-Codex

GPT-5.2-Codex

94

Kimi K2.5

73

95
SimpleQA
74
93
MuSR
72

Frequently Asked Questions

Which is better, GPT-5.2-Codex or Kimi K2.5?

GPT-5.2-Codex scores higher overall with 82 vs 62, a difference of 20 points across all benchmarks.

Which is better for knowledge tasks, GPT-5.2-Codex or Kimi K2.5?

GPT-5.2-Codex leads in knowledge tasks with an average score of 96 vs 74.8.

Which is better for coding, GPT-5.2-Codex or Kimi K2.5?

GPT-5.2-Codex leads in coding with an average score of 95 vs 69.

Which is better for math, GPT-5.2-Codex or Kimi K2.5?

GPT-5.2-Codex leads in math with an average score of 97.1 vs 76.

Which is better for reasoning, GPT-5.2-Codex or Kimi K2.5?

GPT-5.2-Codex leads in reasoning with an average score of 94 vs 73.

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