benchlm.ai

Claude Opus 4.5 vs GPT-5.1

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

Quick Verdict

Claude Opus 4.5 wins overall with a score of 79 vs 76 (3 point difference).Claude Opus 4.5 wins 3 out of 4 categories.

Claude Opus 4.5

CreatorAnthropic
TypeProprietary
Context200K
Score79

GPT-5.1

CreatorOpenAI
TypeProprietary
Context400K
Score76

Knowledge

Claude Opus 4.5

Claude Opus 4.5

96

GPT-5.1

94

99
MMLU
97
97
GPQA
95
95
SuperGPQA
93
93
OpenBookQA
91

Coding

Claude Opus 4.5

Claude Opus 4.5

91

GPT-5.1

89

91
HumanEval
89

Mathematics

Tie

Claude Opus 4.5

97.1

GPT-5.1

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

Claude Opus 4.5

Claude Opus 4.5

94

GPT-5.1

92

95
SimpleQA
93
93
MuSR
91

Frequently Asked Questions

Which is better, Claude Opus 4.5 or GPT-5.1?

Claude Opus 4.5 scores higher overall with 79 vs 76, a difference of 3 points across all benchmarks.

Which is better for knowledge tasks, Claude Opus 4.5 or GPT-5.1?

Claude Opus 4.5 leads in knowledge tasks with an average score of 96 vs 94.

Which is better for coding, Claude Opus 4.5 or GPT-5.1?

Claude Opus 4.5 leads in coding with an average score of 91 vs 89.

Which is better for math, Claude Opus 4.5 or GPT-5.1?

Claude Opus 4.5 and GPT-5.1 are tied for math with average scores of 97.1.

Which is better for reasoning, Claude Opus 4.5 or GPT-5.1?

Claude Opus 4.5 leads in reasoning with an average score of 94 vs 92.

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