DeepSeek V4 Flash vs OpenAI o3
Compare DeepSeek V4 Flash by DeepSeek against OpenAI o3 by OpenAI, tested across 53 shared challenges.
Our Verdict
DeepSeek V4 Flash
OpenAI o3
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 143x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
DeepSeek V4 Flash
Input
$0.14
71× cheaper
Output
$0.28
143× cheaper
OpenAI o3
Input
$10.00
Output
$40.00
DeepSeek V4 Flash is cheaper on both — 71× input, 143× output
Writing DNA
Style Comparison
Similarity
53%
DeepSeek V4 Flash uses 5.2x more bold
DeepSeek V4 Flash
OpenAI o3
54%Vocabulary68%
17wSentence Length14w
0.52Hedging0.26
3.6Bold0.7
2.6Lists3.0
0.00Emoji0.00
0.41Headings0.38
0.19Transitions0.12
Based on 27 + 16 text responses
Research
What we learned reading every model
FAQ
