DeepSeek V4 Flash vs GPT-5.4
Compare DeepSeek V4 Flash by DeepSeek against GPT-5.4 by OpenAI, context windows of 1.0M vs 1.1M, tested across 53 shared challenges.
Our Verdict
DeepSeek V4 Flash
GPT-5.4
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 54x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
DeepSeek V4 Flash
Input
$0.14
18× cheaper
Output
$0.28
54× cheaper
GPT-5.4
Input
$2.50
Output
$15.00
DeepSeek V4 Flash is cheaper on both — 18× input, 54× output
Writing DNA
Style Comparison
Similarity
36%
DeepSeek V4 Flash uses 10.1x more transitions
DeepSeek V4 Flash
GPT-5.4
54%Vocabulary54%
17wSentence Length28w
0.52Hedging0.69
3.6Bold4.1
2.6Lists8.1
0.00Emoji0.00
0.41Headings1.84
0.19Transitions0.02
Based on 27 + 22 text responses
Research
What we learned reading every model
FAQ
