DeepSeek V4 Flash vs GPT-5.4 Pro
Compare DeepSeek V4 Flash by DeepSeek against GPT-5.4 Pro by OpenAI, context windows of 1.0M vs 1.1M, tested across 18 shared challenges.
Our Verdict
DeepSeek V4 Flash
GPT-5.4 Pro
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 643x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
DeepSeek V4 Flash
Input
$0.14
214× cheaper
Output
$0.28
643× cheaper
GPT-5.4 Pro
Input
$30.00
Output
$180.00
DeepSeek V4 Flash is cheaper on both — 214× input, 643× output
Writing DNA
Style Comparison
Similarity
32%
DeepSeek V4 Flash uses 18.5x more transitions
DeepSeek V4 Flash
GPT-5.4 Pro
54%Vocabulary50%
17wSentence Length35w
0.52Hedging0.70
3.6Bold7.5
2.6Lists8.3
0.00Emoji0.00
0.41Headings2.52
0.19Transitions0.01
Based on 27 + 12 text responses
Research
What we learned reading every model
FAQ
