benchlm.ai

Claude Opus 4.5 vs Gemini 2.5 Flash

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 41 (38 point difference).Claude Opus 4.5 wins 4 out of 4 categories.

Claude Opus 4.5

CreatorAnthropic
TypeProprietary
Context200K
Score79

Gemini 2.5 Flash

CreatorGoogle
TypeProprietary
Context1M
Score41

Knowledge

Claude Opus 4.5

Claude Opus 4.5

96

Gemini 2.5 Flash

47.8

99
MMLU
50
97
GPQA
49
95
SuperGPQA
47
93
OpenBookQA
45

Coding

Claude Opus 4.5

Claude Opus 4.5

91

Gemini 2.5 Flash

42

91
HumanEval
42

Mathematics

Claude Opus 4.5

Claude Opus 4.5

97.1

Gemini 2.5 Flash

49

99
AIME 2023
50
99
AIME 2024
52
98
AIME 2025
51
95
HMMT Feb 2023
46
97
HMMT Feb 2024
48
96
HMMT Feb 2025
47
96
BRUMO 2025
49

Reasoning

Claude Opus 4.5

Claude Opus 4.5

94

Gemini 2.5 Flash

47

95
SimpleQA
48
93
MuSR
46

Frequently Asked Questions

Which is better, Claude Opus 4.5 or Gemini 2.5 Flash?

Claude Opus 4.5 scores higher overall with 79 vs 41, a difference of 38 points across all benchmarks.

Which is better for knowledge tasks, Claude Opus 4.5 or Gemini 2.5 Flash?

Claude Opus 4.5 leads in knowledge tasks with an average score of 96 vs 47.8.

Which is better for coding, Claude Opus 4.5 or Gemini 2.5 Flash?

Claude Opus 4.5 leads in coding with an average score of 91 vs 42.

Which is better for math, Claude Opus 4.5 or Gemini 2.5 Flash?

Claude Opus 4.5 leads in math with an average score of 97.1 vs 49.

Which is better for reasoning, Claude Opus 4.5 or Gemini 2.5 Flash?

Claude Opus 4.5 leads in reasoning with an average score of 94 vs 47.

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