benchlm.ai

Claude 3.5 Sonnet 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 55 (22 point difference).GPT-5.1-Codex-Max wins 4 out of 4 categories.

Claude 3.5 Sonnet

CreatorAnthropic
TypeProprietary
Context200K
Score55

GPT-5.1-Codex-Max

CreatorOpenAI
TypeProprietary
Context400K
Score77

Knowledge

GPT-5.1-Codex-Max

Claude 3.5 Sonnet

63.5

GPT-5.1-Codex-Max

95

65
MMLU
98
65
GPQA
96
63
SuperGPQA
94
61
OpenBookQA
92

Coding

GPT-5.1-Codex-Max

Claude 3.5 Sonnet

57

GPT-5.1-Codex-Max

94

57
HumanEval
94

Mathematics

GPT-5.1-Codex-Max

Claude 3.5 Sonnet

64

GPT-5.1-Codex-Max

97.1

65
AIME 2023
99
67
AIME 2024
99
66
AIME 2025
98
61
HMMT Feb 2023
95
63
HMMT Feb 2024
97
62
HMMT Feb 2025
96
64
BRUMO 2025
96

Reasoning

GPT-5.1-Codex-Max

Claude 3.5 Sonnet

62

GPT-5.1-Codex-Max

93

63
SimpleQA
94
61
MuSR
92

Frequently Asked Questions

Which is better, Claude 3.5 Sonnet or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max scores higher overall with 77 vs 55, a difference of 22 points across all benchmarks.

Which is better for knowledge tasks, Claude 3.5 Sonnet or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in knowledge tasks with an average score of 95 vs 63.5.

Which is better for coding, Claude 3.5 Sonnet or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in coding with an average score of 94 vs 57.

Which is better for math, Claude 3.5 Sonnet or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in math with an average score of 97.1 vs 64.

Which is better for reasoning, Claude 3.5 Sonnet or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in reasoning with an average score of 93 vs 62.

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