DeepSeek V4 Flash vs GPT-4.5
Compare DeepSeek V4 Flash by DeepSeek against GPT-4.5 by OpenAI, context windows of 1.0M vs 128K, tested across 24 shared challenges.
Our Verdict
DeepSeek V4 Flash
GPT-4.5
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 536x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
DeepSeek V4 Flash
Input
$0.14
536× cheaper
Output
$0.28
536× cheaper
GPT-4.5
Input
$75.00
Output
$150.00
DeepSeek V4 Flash is cheaper on both — 536× input, 536× output
Writing DNA
Style Comparison
Similarity
50%
GPT-4.5 uses 3.2x more headings
DeepSeek V4 Flash
GPT-4.5
54%Vocabulary63%
17wSentence Length16w
0.52Hedging0.57
3.6Bold4.7
2.6Lists6.4
0.00Emoji0.00
0.41Headings1.30
0.19Transitions0.54
Based on 27 + 11 text responses
Research
What we learned reading every model
FAQ
