DeepSeek V4 Flash vs GPT-5.4 Mini
Compare DeepSeek V4 Flash by DeepSeek against GPT-5.4 Mini by OpenAI, context windows of 1.0M vs 400K, tested across 53 shared challenges.
Our Verdict
DeepSeek V4 Flash
GPT-5.4 MiniRunner-up
No community votes yet. On paper, DeepSeek V4 Flash has the edge — bigger model tier, newer, bigger context window.
DeepSeek V4 Flash is 16x cheaper per token — worth considering if cost matters.
Slight edge
API pricing
Cost per 1M tokens
DeepSeek V4 Flash
Input
$0.14
5.4× cheaper
Output
$0.28
16× cheaper
GPT-5.4 Mini
Input
$0.75
Output
$4.50
DeepSeek V4 Flash is cheaper on both — 5.4× input, 16× output
Writing DNA
Style Comparison
Similarity
38%
GPT-5.4 Mini uses 5.2x more headings
DeepSeek V4 Flash
GPT-5.4 Mini
54%Vocabulary54%
17wSentence Length20w
0.52Hedging0.72
3.6Bold6.0
2.6Lists8.3
0.00Emoji0.00
0.41Headings2.11
0.19Transitions0.04
Based on 27 + 23 text responses
Research
What we learned reading every model
FAQ
