Claude Sonnet 4 vs DeepSeek V4 Flash 0731
Compare Claude Sonnet 4 by Anthropic against DeepSeek V4 Flash 0731 by DeepSeek, context windows of 200K vs 1.0M, tested across 42 shared challenges.
Our Verdict
DeepSeek V4 Flash 0731
Claude Sonnet 4Runner-up
No community votes yet. On paper, DeepSeek V4 Flash 0731 has the edge — newer, bigger context window.
DeepSeek V4 Flash 0731 is 54x 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
DeepSeek V4 Flash 0731
Input
$0.14
21× cheaper
Output
$0.28
54× cheaper
DeepSeek V4 Flash 0731 is cheaper on both — 21× input, 54× output
Writing DNA
Style Comparison
Similarity
34%
Claude Sonnet 4 uses 87.9x more emoji
Claude Sonnet 4
DeepSeek V4 Flash 0731
62%Vocabulary52%
111wSentence Length18w
0.40Hedging0.38
5.0Bold5.7
9.3Lists3.4
0.88Emoji0.00
2.16Headings0.83
0.33Transitions0.04
Based on 17 + 23 text responses
Research
What we learned reading every model
FAQ
