Claude Sonnet 4 vs Gemini 2.5 Flash Preview
Compare Claude Sonnet 4 by Anthropic against Gemini 2.5 Flash Preview by Google AI, in 6 community votes, claude sonnet 4 and gemini 2.5 flash preview are closely matched, context windows of 200K vs 1.0M, tested across 27 shared challenges.
Web Design: Gemini 2.5 Flash Preview wins 100% of votes
Image Generation: Claude Sonnet 4 wins 100% of votes
Our Verdict
Claude Sonnet 4
Gemini 2.5 Flash Preview
Too close to call. Pick based on your use case.
Pick Claude Sonnet 4 for Image Generation. Pick Gemini 2.5 Flash Preview for Web Design. Gemini 2.5 Flash Preview is 25x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Claude Sonnet 4
Input
$3.00
Output
$15.00
Gemini 2.5 Flash Preview
Input
$0.15
20× cheaper
Output
$0.60
25× cheaper
Gemini 2.5 Flash Preview is cheaper on both — 20× input, 25× output
Writing DNA
Style Comparison
Similarity
37%
Claude Sonnet 4 uses 87.9x more emoji
Claude Sonnet 4
Gemini 2.5 Flash Preview
62%Vocabulary51%
111wSentence Length15w
0.40Hedging0.70
5.0Bold4.1
9.3Lists3.3
0.88Emoji0.00
2.16Headings0.09
0.33Transitions0.24
Based on 17 + 12 text responses
Research
What we learned reading every model
FAQ
