Claude Opus 4.5 vs Google: Gemini 2.5 Flash Preview 09-2025
Compare Claude Opus 4.5 by Anthropic against Google: Gemini 2.5 Flash Preview 09-2025 by Google AI, tested across 51 shared challenges.
Our Verdict
Claude Opus 4.5
Google: Gemini 2.5 Flash Preview 09-2025
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Too close to call
API pricing
Cost per 1M tokens
Claude Opus 4.5
Input
—
Output
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Google: Gemini 2.5 Flash Preview 09-2025
Input
$0.30
Output
$2.50
Writing DNA
Style Comparison
Similarity
44%
Google: Gemini 2.5 Flash Preview 09-2025 uses 4.1x more transitions
Claude Opus 4.5
Google: Gemini 2.5 Flash Preview 09-2025
64%Vocabulary53%
55wSentence Length19w
0.86Hedging0.30
5.8Bold5.8
4.5Lists3.1
0.15Emoji0.14
1.59Headings0.93
0.05Transitions0.22
Based on 24 + 22 text responses
Research
What we learned reading every model
FAQ
