benchlm.ai

Claude Opus 4.5 vs GPT-5 mini

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 68 (11 point difference).Claude Opus 4.5 wins 4 out of 4 categories.

Claude Opus 4.5

CreatorAnthropic
TypeProprietary
Context200K
Score79

GPT-5 mini

CreatorOpenAI
TypeProprietary
Context128K
Score68

Knowledge

Claude Opus 4.5

Claude Opus 4.5

96

GPT-5 mini

85

99
MMLU
88
97
GPQA
86
95
SuperGPQA
84
93
OpenBookQA
82

Coding

Claude Opus 4.5

Claude Opus 4.5

91

GPT-5 mini

80

91
HumanEval
80

Mathematics

Claude Opus 4.5

Claude Opus 4.5

97.1

GPT-5 mini

89

99
AIME 2023
90
99
AIME 2024
92
98
AIME 2025
91
95
HMMT Feb 2023
86
97
HMMT Feb 2024
88
96
HMMT Feb 2025
87
96
BRUMO 2025
89

Reasoning

Claude Opus 4.5

Claude Opus 4.5

94

GPT-5 mini

83

95
SimpleQA
84
93
MuSR
82

Frequently Asked Questions

Which is better, Claude Opus 4.5 or GPT-5 mini?

Claude Opus 4.5 scores higher overall with 79 vs 68, a difference of 11 points across all benchmarks.

Which is better for knowledge tasks, Claude Opus 4.5 or GPT-5 mini?

Claude Opus 4.5 leads in knowledge tasks with an average score of 96 vs 85.

Which is better for coding, Claude Opus 4.5 or GPT-5 mini?

Claude Opus 4.5 leads in coding with an average score of 91 vs 80.

Which is better for math, Claude Opus 4.5 or GPT-5 mini?

Claude Opus 4.5 leads in math with an average score of 97.1 vs 89.

Which is better for reasoning, Claude Opus 4.5 or GPT-5 mini?

Claude Opus 4.5 leads in reasoning with an average score of 94 vs 83.

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