DeepSeek R1 vs GPT-5.1-Codex
Compare DeepSeek R1 by DeepSeek against GPT-5.1-Codex by OpenAI, context windows of 128K vs 400K, tested across 52 shared challenges.
Our Verdict
GPT-5.1-Codex
DeepSeek R1Runner-up
No community votes yet. On paper, GPT-5.1-Codex has the edge — bigger model tier, newer, bigger context window.
DeepSeek R1 is 4.6x cheaper per token — worth considering if cost matters.
Slight edge
API pricing
Cost per 1M tokens
DeepSeek R1
Input
$0.55
2.3× cheaper
Output
$2.19
4.6× cheaper
GPT-5.1-Codex
Input
$1.25
Output
$10.00
DeepSeek R1 is cheaper on both — 2.3× input, 4.6× output
Writing DNA
Style Comparison
Similarity
66%
DeepSeek R1 uses 4.3x more emoji
DeepSeek R1
GPT-5.1-Codex
62%Vocabulary70%
15wSentence Length17w
0.52Hedging0.39
8.0Bold3.4
5.7Lists3.5
0.04Emoji0.00
0.62Headings0.50
0.28Transitions0.38
Based on 22 + 14 text responses
Research
What we learned reading every model
FAQ
Common questions
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