Claude Opus 4 vs Gemini 2.5 Pro (I/O Edition)
Compare Claude Opus 4 by Anthropic against Gemini 2.5 Pro (I/O Edition) by Google AI, in 45 community votes, claude opus 4 and gemini 2.5 pro (i/o edition) are closely matched, tested across 40 shared challenges.
Web Design: Claude Opus 4 wins 63% of votes
Image Generation: Gemini 2.5 Pro (I/O Edition) wins 86% of votes
Conversation: Claude Opus 4 wins 100% of votes
Our Verdict
Claude Opus 4
Gemini 2.5 Pro (I/O Edition)
Too close to call. Pick based on your use case.
Pick Claude Opus 4 for Conversation, Web Design. Pick Gemini 2.5 Pro (I/O Edition) for Image Generation. Gemini 2.5 Pro (I/O Edition) is 7.5x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Claude Opus 4
Input
$15.00
Output
$75.00
Gemini 2.5 Pro (I/O Edition)
Input
$1.25
12× cheaper
Output
$10.00
7.5× cheaper
Gemini 2.5 Pro (I/O Edition) is cheaper on both — 12× input, 7.5× output
Writing DNA
Style Comparison
Similarity
68%
Claude Opus 4 uses 11.2x more emoji
Claude Opus 4
Gemini 2.5 Pro (I/O Edition)
64%Vocabulary58%
62wSentence Length16w
0.52Hedging0.38
4.4Bold5.8
9.1Lists5.0
0.11Emoji0.00
1.87Headings0.63
0.27Transitions0.01
Based on 16 + 16 text responses
Research
What we learned reading every model
FAQ
