Claude Sonnet 5 vs DeepSeek V4 Flash
Compare Claude Sonnet 5 by Anthropic against DeepSeek V4 Flash by DeepSeek, context windows of 1.0M vs 1.0M, tested across 54 shared challenges.
Our Verdict
Claude Sonnet 5
DeepSeek V4 Flash
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
DeepSeek V4 Flash is 36x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Claude Sonnet 5
Input
$2.00
Output
$10.00
DeepSeek V4 Flash
Input
$0.14
14× cheaper
Output
$0.28
36× cheaper
DeepSeek V4 Flash is cheaper on both — 14× input, 36× output
Writing DNA
Style Comparison
Similarity
39%
Claude Sonnet 5 uses 79.4x more emoji
Claude Sonnet 5
DeepSeek V4 Flash
59%Vocabulary54%
35wSentence Length17w
0.53Hedging0.52
3.5Bold3.6
3.5Lists2.6
0.79Emoji0.00
1.25Headings0.41
0.06Transitions0.19
Based on 27 + 27 text responses
Research
What we learned reading every model
FAQ
