benchlm.ai

Claude 4.1 Opus 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 61 (16 point difference).GPT-5.1-Codex-Max wins 4 out of 4 categories.

Claude 4.1 Opus

CreatorAnthropic
TypeProprietary
Context200K
Score61

GPT-5.1-Codex-Max

CreatorOpenAI
TypeProprietary
Context400K
Score77

Knowledge

GPT-5.1-Codex-Max

Claude 4.1 Opus

74.5

GPT-5.1-Codex-Max

95

76
MMLU
98
76
GPQA
96
74
SuperGPQA
94
72
OpenBookQA
92

Coding

GPT-5.1-Codex-Max

Claude 4.1 Opus

68

GPT-5.1-Codex-Max

94

68
HumanEval
94

Mathematics

GPT-5.1-Codex-Max

Claude 4.1 Opus

75

GPT-5.1-Codex-Max

97.1

76
AIME 2023
99
78
AIME 2024
99
77
AIME 2025
98
72
HMMT Feb 2023
95
74
HMMT Feb 2024
97
73
HMMT Feb 2025
96
75
BRUMO 2025
96

Reasoning

GPT-5.1-Codex-Max

Claude 4.1 Opus

73

GPT-5.1-Codex-Max

93

74
SimpleQA
94
72
MuSR
92

Frequently Asked Questions

Which is better, Claude 4.1 Opus or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max scores higher overall with 77 vs 61, a difference of 16 points across all benchmarks.

Which is better for knowledge tasks, Claude 4.1 Opus or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in knowledge tasks with an average score of 95 vs 74.5.

Which is better for coding, Claude 4.1 Opus or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in coding with an average score of 94 vs 68.

Which is better for math, Claude 4.1 Opus or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in math with an average score of 97.1 vs 75.

Which is better for reasoning, Claude 4.1 Opus or GPT-5.1-Codex-Max?

GPT-5.1-Codex-Max leads in reasoning with an average score of 93 vs 73.

Related Comparisons

Claude 4.1 Opus vs GPT-5.4Claude 4.1 Opus vs Gemini 3.1 ProClaude 4.1 Opus vs Claude Opus 4.6Claude 4.1 Opus vs GPT-5.3 CodexClaude 4.1 Opus vs Grok 4.1Claude 4.1 Opus vs GPT-5.2