DeepSeek V4 Flash 0731 vs Sonar Pro Search
Compare DeepSeek V4 Flash 0731 by DeepSeek against Sonar Pro Search by Perplexity, context windows of 1.0M vs 200K, tested across 41 shared challenges.
Our Verdict
DeepSeek V4 Flash 0731
Sonar Pro SearchRunner-up
No community votes yet. On paper, DeepSeek V4 Flash 0731 has the edge — newer, bigger context window, major provider backing.
DeepSeek V4 Flash 0731 is 54x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
DeepSeek V4 Flash 0731
Input
$0.14
21× cheaper
Output
$0.28
54× cheaper
Sonar Pro Search
Input
$3.00
Output
$15.00
DeepSeek V4 Flash 0731 is cheaper on both — 21× input, 54× output
Writing DNA
Style Comparison
Similarity
48%
Sonar Pro Search uses 2.5x more headings
DeepSeek V4 Flash 0731
Sonar Pro Search
52%Vocabulary60%
18wSentence Length22w
0.38Hedging0.30
5.7Bold2.7
3.4Lists2.6
0.00Emoji0.00
0.83Headings2.08
0.04Transitions0.07
Based on 23 + 25 text responses
Research
What we learned reading every model
FAQ
