benchlm.ai

GPT-4 Turbo vs GPT-5.1-Codex-Max

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

Quick Verdict

GPT-5.1-Codex-Max wins overall with a score of 77 vs 50 (27 point difference).GPT-5.1-Codex-Max wins 4 out of 4 categories.

GPT-4 Turbo

CreatorOpenAI
TypeProprietary
Context128K
Score50

GPT-5.1-Codex-Max

CreatorOpenAI
TypeProprietary
Context400K
Score77

Knowledge

GPT-5.1-Codex-Max

GPT-4 Turbo

58.5

GPT-5.1-Codex-Max

95

60
MMLU
98
60
GPQA
96
58
SuperGPQA
94
56
OpenBookQA
92

Coding

GPT-5.1-Codex-Max

GPT-4 Turbo

52

GPT-5.1-Codex-Max

94

52
HumanEval
94

Mathematics

GPT-5.1-Codex-Max

GPT-4 Turbo

59

GPT-5.1-Codex-Max

97.1

60
AIME 2023
99
62
AIME 2024
99
61
AIME 2025
98
56
HMMT Feb 2023
95
58
HMMT Feb 2024
97
57
HMMT Feb 2025
96
59
BRUMO 2025
96

Reasoning

GPT-5.1-Codex-Max

GPT-4 Turbo

57

GPT-5.1-Codex-Max

93

58
SimpleQA
94
56
MuSR
92

Frequently Asked Questions

Which is better, GPT-4 Turbo or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max scores higher overall with 77 vs 50, a difference of 27 points across all benchmarks.

Which is better for knowledge tasks, GPT-4 Turbo or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in knowledge tasks with an average score of 95 vs 58.5.

Which is better for coding, GPT-4 Turbo or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in coding with an average score of 94 vs 52.

Which is better for math, GPT-4 Turbo or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in math with an average score of 97.1 vs 59.

Which is better for reasoning, GPT-4 Turbo or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in reasoning with an average score of 93 vs 57.

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