benchlm.ai

Claude 4.1 Opus Thinking 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 29 (48 point difference).GPT-5.1-Codex-Max wins 4 out of 4 categories.

Claude 4.1 Opus Thinking

CreatorAnthropic
TypeProprietary
Context200K
Score29

GPT-5.1-Codex-Max

CreatorOpenAI
TypeProprietary
Context400K
Score77

Knowledge

GPT-5.1-Codex-Max

Claude 4.1 Opus Thinking

35.8

GPT-5.1-Codex-Max

95

38
MMLU
98
37
GPQA
96
35
SuperGPQA
94
33
OpenBookQA
92

Coding

GPT-5.1-Codex-Max

Claude 4.1 Opus Thinking

30

GPT-5.1-Codex-Max

94

30
HumanEval
94

Mathematics

GPT-5.1-Codex-Max

Claude 4.1 Opus Thinking

37

GPT-5.1-Codex-Max

97.1

38
AIME 2023
99
40
AIME 2024
99
39
AIME 2025
98
34
HMMT Feb 2023
95
36
HMMT Feb 2024
97
35
HMMT Feb 2025
96
37
BRUMO 2025
96

Reasoning

GPT-5.1-Codex-Max

Claude 4.1 Opus Thinking

35

GPT-5.1-Codex-Max

93

36
SimpleQA
94
34
MuSR
92

Frequently Asked Questions

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

GPT-5.1-Codex-Max scores higher overall with 77 vs 29, a difference of 48 points across all benchmarks.

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

GPT-5.1-Codex-Max leads in knowledge tasks with an average score of 95 vs 35.8.

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

GPT-5.1-Codex-Max leads in coding with an average score of 94 vs 30.

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

GPT-5.1-Codex-Max leads in math with an average score of 97.1 vs 37.

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

GPT-5.1-Codex-Max leads in reasoning with an average score of 93 vs 35.

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