benchlm.ai

GPT-5.1-Codex-Max 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 77 (11 point difference).GPT-5.4 wins 2 out of 4 categories.

GPT-5.1-Codex-Max

CreatorOpenAI
TypeProprietary
Context400K
Score77

GPT-5.4

CreatorOpenAI
TypeProprietary
Context1M
Score88

Knowledge

GPT-5.4

GPT-5.1-Codex-Max

95

GPT-5.4

96

98
MMLU
99
96
GPQA
97
94
SuperGPQA
95
92
OpenBookQA
93

Coding

GPT-5.1-Codex-Max

GPT-5.1-Codex-Max

94

GPT-5.4

91

94
HumanEval
91

Mathematics

Tie

GPT-5.1-Codex-Max

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

GPT-5.4

GPT-5.1-Codex-Max

93

GPT-5.4

94

94
SimpleQA
95
92
MuSR
93

Frequently Asked Questions

Which is better, GPT-5.1-Codex-Max or GPT-5.4?

GPT-5.4 scores higher overall with 88 vs 77, a difference of 11 points across all benchmarks.

Which is better for knowledge tasks, GPT-5.1-Codex-Max or GPT-5.4?

GPT-5.4 leads in knowledge tasks with an average score of 96 vs 95.

Which is better for coding, GPT-5.1-Codex-Max or GPT-5.4?

GPT-5.1-Codex-Max leads in coding with an average score of 94 vs 91.

Which is better for math, GPT-5.1-Codex-Max or GPT-5.4?

GPT-5.1-Codex-Max and GPT-5.4 are tied for math with average scores of 97.1.

Which is better for reasoning, GPT-5.1-Codex-Max or GPT-5.4?

GPT-5.4 leads in reasoning with an average score of 94 vs 93.

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