DeepSeek R1 vs GPT-5.5
Compare DeepSeek R1 by DeepSeek against GPT-5.5 by OpenAI, context windows of 128K vs 1.1M, tested across 53 shared challenges.
Our Verdict
GPT-5.5
DeepSeek R1Runner-up
No community votes yet. On paper, GPT-5.5 has the edge — bigger model tier, newer, bigger context window.
DeepSeek R1 is 14x cheaper per token — worth considering if cost matters.
Slight edge
API pricing
Cost per 1M tokens
DeepSeek R1
Input
$0.55
9.1× cheaper
Output
$2.19
14× cheaper
GPT-5.5
Input
$5.00
Output
$30.00
DeepSeek R1 is cheaper on both — 9.1× input, 14× output
Writing DNA
Style Comparison
Similarity
49%
DeepSeek R1 uses 4.3x more emoji
DeepSeek R1
GPT-5.5
62%Vocabulary58%
15wSentence Length18w
0.52Hedging0.74
8.0Bold2.9
5.7Lists5.1
0.04Emoji0.00
0.62Headings1.68
0.28Transitions0.03
Based on 22 + 26 text responses
Research
What we learned reading every model
FAQ
