GPT-5.2-Codex vs Moonshot v1

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 44 (38 point difference).GPT-5.2-Codex wins 4 out of 4 categories.

Knowledge

GPT-5.2-Codex

GPT-5.2-Codex

96

Moonshot v1

50.8

99
MMLU
53
97
GPQA
52
95
SuperGPQA
50
93
OpenBookQA
48

Coding

GPT-5.2-Codex

GPT-5.2-Codex

95

Moonshot v1

45

95
HumanEval
45

Mathematics

GPT-5.2-Codex

GPT-5.2-Codex

97.1

Moonshot v1

52

99
AIME 2023
53
99
AIME 2024
55
98
AIME 2025
54
95
HMMT Feb 2023
49
97
HMMT Feb 2024
51
96
HMMT Feb 2025
50
96
BRUMO 2025
52

Reasoning

GPT-5.2-Codex

GPT-5.2-Codex

94

Moonshot v1

50

95
SimpleQA
51
93
MuSR
49

Frequently Asked Questions

Which is better, GPT-5.2-Codex or Moonshot v1?

GPT-5.2-Codex scores higher overall with 82 vs 44, a difference of 38 points across all benchmarks.

Which is better for knowledge tasks, GPT-5.2-Codex or Moonshot v1?

GPT-5.2-Codex leads in knowledge tasks with an average score of 96 vs 50.8.

Which is better for coding, GPT-5.2-Codex or Moonshot v1?

GPT-5.2-Codex leads in coding with an average score of 95 vs 45.

Which is better for math, GPT-5.2-Codex or Moonshot v1?

GPT-5.2-Codex leads in math with an average score of 97.1 vs 52.

Which is better for reasoning, GPT-5.2-Codex or Moonshot v1?

GPT-5.2-Codex leads in reasoning with an average score of 94 vs 50.