DeepSeek V3.1 vs GPT-5.5
Compare DeepSeek V3.1 by DeepSeek against GPT-5.5 by OpenAI, context windows of 164K vs 1.1M, tested across 53 shared challenges.
Our Verdict
GPT-5.5
DeepSeek V3.1Runner-up
No community votes yet. On paper, GPT-5.5 has the edge — newer, bigger context window.
DeepSeek V3.1 is 38x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
DeepSeek V3.1
Input
$0.20
25× cheaper
Output
$0.80
38× cheaper
GPT-5.5
Input
$5.00
Output
$30.00
DeepSeek V3.1 is cheaper on both — 25× input, 38× output
Writing DNA
Style Comparison
Similarity
53%
DeepSeek V3.1 uses 2.4x more emoji
DeepSeek V3.1
GPT-5.5
53%Vocabulary58%
14wSentence Length18w
0.42Hedging0.74
4.0Bold2.9
3.6Lists5.1
0.02Emoji0.00
0.40Headings1.68
0.22Transitions0.03
Based on 23 + 26 text responses
Research
What we learned reading every model
FAQ
