GPT-5.2-Codex vs GPT-5.4

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

Quick Verdict

GPT-5.4 wins overall with a score of 88 vs 82 (6 point difference).GPT-5.4 wins 0 out of 4 categories.

Knowledge

Tie

GPT-5.2-Codex

96

GPT-5.4

96

99
MMLU
99
97
GPQA
97
95
SuperGPQA
95
93
OpenBookQA
93

Coding

GPT-5.2-Codex

GPT-5.2-Codex

95

GPT-5.4

91

95
HumanEval
91

Mathematics

Tie

GPT-5.2-Codex

97.1

GPT-5.4

97.1

99
AIME 2023
99
99
AIME 2024
99
98
AIME 2025
98
95
HMMT Feb 2023
95
97
HMMT Feb 2024
97
96
HMMT Feb 2025
96
96
BRUMO 2025
96

Reasoning

Tie

GPT-5.2-Codex

94

GPT-5.4

94

95
SimpleQA
95
93
MuSR
93

Frequently Asked Questions

Which is better, GPT-5.2-Codex or GPT-5.4?

GPT-5.4 scores higher overall with 88 vs 82, a difference of 6 points across all benchmarks.

Which is better for knowledge tasks, GPT-5.2-Codex or GPT-5.4?

GPT-5.2-Codex and GPT-5.4 are tied for knowledge tasks with average scores of 96.

Which is better for coding, GPT-5.2-Codex or GPT-5.4?

GPT-5.2-Codex leads in coding with an average score of 95 vs 91.

Which is better for math, GPT-5.2-Codex or GPT-5.4?

GPT-5.2-Codex and GPT-5.4 are tied for math with average scores of 97.1.

Which is better for reasoning, GPT-5.2-Codex or GPT-5.4?

GPT-5.2-Codex and GPT-5.4 are tied for reasoning with average scores of 94.