benchlm.ai

Claude Opus 4.5 vs o3-pro

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

o3-pro

CreatorOpenAI
TypeProprietary
Context200K
Score68

Knowledge

Claude Opus 4.5

Claude Opus 4.5

96

o3-pro

87.3

99
MMLU
88
97
GPQA
89
95
SuperGPQA
87
93
OpenBookQA
85

Coding

Claude Opus 4.5

Claude Opus 4.5

91

o3-pro

80

91
HumanEval
80

Mathematics

Claude Opus 4.5

Claude Opus 4.5

97.1

o3-pro

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

o3-pro

85

95
SimpleQA
86
93
MuSR
84

Frequently Asked Questions

Which is better, Claude Opus 4.5 or o3-pro?

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 o3-pro?

Claude Opus 4.5 leads in knowledge tasks with an average score of 96 vs 87.3.

Which is better for coding, Claude Opus 4.5 or o3-pro?

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 o3-pro?

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 o3-pro?

Claude Opus 4.5 leads in reasoning with an average score of 94 vs 85.

Related Comparisons

Claude Opus 4.5 vs GPT-5.4Claude Opus 4.5 vs Gemini 3.1 ProClaude Opus 4.5 vs Claude Opus 4.6Claude Opus 4.5 vs GPT-5.3 CodexClaude Opus 4.5 vs Grok 4.1Claude Opus 4.5 vs GPT-5.2