DeepSeek V3.1 vs DeepSeek V4 Flash 0731
Compare DeepSeek V3.1 and DeepSeek V4 Flash 0731, both from DeepSeek, context windows of 164K vs 1.0M, tested across 42 shared challenges.
Our Verdict
DeepSeek V3.1
DeepSeek V4 Flash 0731
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Too close to call
API pricing
Cost per 1M tokens
DeepSeek V3.1
Input
$0.20
Output
$0.80
DeepSeek V4 Flash 0731
Input
$0.14
1.4× cheaper
Output
$0.28
2.9× cheaper
DeepSeek V4 Flash 0731 is cheaper on both — 1.4× input, 2.9× output
Writing DNA
Style Comparison
Similarity
59%
DeepSeek V3.1 uses 2.4x more emoji
DeepSeek V3.1
DeepSeek V4 Flash 0731
53%Vocabulary52%
14wSentence Length18w
0.42Hedging0.38
4.0Bold5.7
3.6Lists3.4
0.02Emoji0.00
0.40Headings0.83
0.22Transitions0.04
Based on 23 + 23 text responses
Research
What we learned reading every model
FAQ
