Claude Opus 5 vs Gemini 2.5 Pro (I/O Edition)
Compare Claude Opus 5 by Anthropic against Gemini 2.5 Pro (I/O Edition) by Google AI, tested across 40 shared challenges.
Our Verdict
Claude Opus 5
Gemini 2.5 Pro (I/O Edition)
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 5
Input
$5.00
Output
$25.00
Gemini 2.5 Pro (I/O Edition)
Input
$1.25
4.0× cheaper
Output
$10.00
2.5× cheaper
Gemini 2.5 Pro (I/O Edition) is cheaper on both — 4.0× input, 2.5× output
Writing DNA
Style Comparison
Similarity
38%
Claude Opus 5 uses 1.7x more emoji
Claude Opus 5
Gemini 2.5 Pro (I/O Edition)
54%Vocabulary58%
21wSentence Length16w
0.40Hedging0.38
3.9Bold5.8
1.9Lists5.0
0.02Emoji0.00
0.71Headings0.63
0.05Transitions0.01
Based on 27 + 16 text responses
Research
What we learned reading every model
FAQ
