DeepSeek V4 Flash 0731 vs GPT-5.5
Compare DeepSeek V4 Flash 0731 by DeepSeek against GPT-5.5 by OpenAI, context windows of 1.0M vs 1.1M, tested across 42 shared challenges.
Our Verdict
DeepSeek V4 Flash 0731
GPT-5.5
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 0731 is 107x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
DeepSeek V4 Flash 0731
Input
$0.14
36× cheaper
Output
$0.28
107× cheaper
GPT-5.5
Input
$5.00
Output
$30.00
DeepSeek V4 Flash 0731 is cheaper on both — 36× input, 107× output
Writing DNA
Style Comparison
Similarity
44%
GPT-5.5 uses 2.0x more headings
DeepSeek V4 Flash 0731
GPT-5.5
52%Vocabulary58%
18wSentence Length18w
0.38Hedging0.74
5.7Bold2.9
3.4Lists5.1
0.00Emoji0.00
0.83Headings1.68
0.04Transitions0.03
Based on 23 + 26 text responses
Research
What we learned reading every model
FAQ
