Claude Sonnet 4 vs Gemini 2.5 Flash Preview (thinking)
Compare Claude Sonnet 4 by Anthropic against Gemini 2.5 Flash Preview (thinking) by Google AI, in 3 community votes, claude sonnet 4 wins 67% of head-to-head duels, context windows of 200K vs 1.0M, tested across 20 shared challenges.
Image Generation: Claude Sonnet 4 wins 100% of votes
Our Verdict
Claude Sonnet 4Winner
Gemini 2.5 Flash Preview (thinking)Runner-up
Pick Claude Sonnet 4. In 3 blind votes, Claude Sonnet 4 wins 67% of the time. That's not luck.
Claude Sonnet 4 particularly excels in Image Generation. Gemini 2.5 Flash Preview (thinking) is 4.3x cheaper per token — worth considering if cost matters.
Clear winner
API pricing
Cost per 1M tokens
Claude Sonnet 4
Input
$3.00
Output
$15.00
Gemini 2.5 Flash Preview (thinking)
Input
$0.17
17× cheaper
Output
$3.50
4.3× cheaper
Gemini 2.5 Flash Preview (thinking) is cheaper on both — 17× input, 4.3× output
Writing DNA
Style Comparison
Similarity
35%
Claude Sonnet 4 uses 87.9x more emoji
Claude Sonnet 4
Gemini 2.5 Flash Preview (thinking)
62%Vocabulary53%
111wSentence Length14w
0.40Hedging0.38
5.0Bold4.4
9.3Lists4.1
0.88Emoji0.00
2.16Headings0.00
0.33Transitions0.24
Based on 17 + 7 text responses
Research
What we learned reading every model
FAQ
