Claude Sonnet 4.5 vs DeepSeek V4 Flash
Compare Claude Sonnet 4.5 by Anthropic against DeepSeek V4 Flash by DeepSeek, in 17 community votes, deepseek v4 flash wins 92% of head-to-head duels, context windows of 200K vs 1.0M, tested across 42 shared challenges.
Web Design: DeepSeek V4 Flash wins 100% of votes
Image Generation: DeepSeek V4 Flash wins 67% of votes
Reasoning: DeepSeek V4 Flash wins 100% of votes
Our Verdict
DeepSeek V4 FlashWinner
Claude Sonnet 4.5Runner-up
Pick DeepSeek V4 Flash. In 17 blind votes, DeepSeek V4 Flash wins 92% of the time. That's not luck.
DeepSeek V4 Flash particularly excels in Web Design, Reasoning, Image Generation. DeepSeek V4 Flash is 54x cheaper per token — worth considering if cost matters.
Clear winner
API pricing
Cost per 1M tokens
Claude Sonnet 4.5
Input
$3.00
Output
$15.00
DeepSeek V4 Flash
Input
$0.14
21× cheaper
Output
$0.28
54× cheaper
DeepSeek V4 Flash is cheaper on both — 21× input, 54× output
Writing DNA
Style Comparison
Similarity
27%
Claude Sonnet 4.5 uses 45.2x more emoji
Claude Sonnet 4.5
DeepSeek V4 Flash
64%Vocabulary54%
94wSentence Length17w
0.48Hedging0.52
4.9Bold3.6
8.0Lists2.6
0.45Emoji0.00
1.91Headings0.41
0.07Transitions0.19
Based on 20 + 27 text responses
Research
What we learned reading every model
FAQ
