Claude Opus 4 vs Gemini 2.5 Flash Preview 05-20 (thinking)
Compare Claude Opus 4 by Anthropic against Gemini 2.5 Flash Preview 05-20 (thinking) by Google AI, in 12 community votes, claude opus 4 wins 60% of head-to-head duels, context windows of 200K vs 1.0M, tested across 11 shared challenges.
Web Design: Claude Opus 4 wins 67% of votes
Image Generation: Claude Opus 4 and Gemini 2.5 Flash Preview 05-20 (thinking) are tied
Our Verdict
Claude Opus 4Winner
Gemini 2.5 Flash Preview 05-20 (thinking)Runner-up
Pick Claude Opus 4. In 12 blind votes, Claude Opus 4 wins 60% of the time. That's not luck.
Claude Opus 4 particularly excels in Web Design. Gemini 2.5 Flash Preview 05-20 (thinking) is 21x cheaper per token — worth considering if cost matters.
Clear winner
API pricing
Cost per 1M tokens
Claude Opus 4
Input
$15.00
Output
$75.00
Gemini 2.5 Flash Preview 05-20 (thinking)
Input
$0.15
100× cheaper
Output
$3.50
21× cheaper
Gemini 2.5 Flash Preview 05-20 (thinking) is cheaper on both — 100× input, 21× output
Writing DNA
Style Comparison
Similarity
50%
Claude Opus 4 uses 52.1x more hedging
Claude Opus 4
Gemini 2.5 Flash Preview 05-20 (thinking)
64%Vocabulary70%
62wSentence Length11w
0.52Hedging0.00
4.4Bold4.2
9.1Lists7.3
0.11Emoji0.00
1.87Headings0.00
0.27Transitions0.00
Based on 16 + 3 text responses
Research
What we learned reading every model
FAQ
