benchlm.ai

GPT-5.2-Codex vs GPT-5 mini

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 68 (14 point difference).GPT-5.2-Codex wins 4 out of 4 categories.

GPT-5.2-Codex

CreatorOpenAI
TypeProprietary
Context400K
Score82

GPT-5 mini

CreatorOpenAI
TypeProprietary
Context128K
Score68

Knowledge

GPT-5.2-Codex

GPT-5.2-Codex

96

GPT-5 mini

85

99
MMLU
88
97
GPQA
86
95
SuperGPQA
84
93
OpenBookQA
82

Coding

GPT-5.2-Codex

GPT-5.2-Codex

95

GPT-5 mini

80

95
HumanEval
80

Mathematics

GPT-5.2-Codex

GPT-5.2-Codex

97.1

GPT-5 mini

89

99
AIME 2023
90
99
AIME 2024
92
98
AIME 2025
91
95
HMMT Feb 2023
86
97
HMMT Feb 2024
88
96
HMMT Feb 2025
87
96
BRUMO 2025
89

Reasoning

GPT-5.2-Codex

GPT-5.2-Codex

94

GPT-5 mini

83

95
SimpleQA
84
93
MuSR
82

Frequently Asked Questions

Which is better, GPT-5.2-Codex or GPT-5 mini?

GPT-5.2-Codex scores higher overall with 82 vs 68, a difference of 14 points across all benchmarks.

Which is better for knowledge tasks, GPT-5.2-Codex or GPT-5 mini?

GPT-5.2-Codex leads in knowledge tasks with an average score of 96 vs 85.

Which is better for coding, GPT-5.2-Codex or GPT-5 mini?

GPT-5.2-Codex leads in coding with an average score of 95 vs 80.

Which is better for math, GPT-5.2-Codex or GPT-5 mini?

GPT-5.2-Codex leads in math with an average score of 97.1 vs 89.

Which is better for reasoning, GPT-5.2-Codex or GPT-5 mini?

GPT-5.2-Codex leads in reasoning with an average score of 94 vs 83.

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