Claude Sonnet 4.5 vs DeepSeek V3.1
Compare Claude Sonnet 4.5 by Anthropic against DeepSeek V3.1 by DeepSeek, context windows of 200K vs 164K, tested across 43 shared challenges.
Our Verdict
Claude Sonnet 4.5
DeepSeek V3.1
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
DeepSeek V3.1 is 19x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Claude Sonnet 4.5
Input
$3.00
Output
$15.00
DeepSeek V3.1
Input
$0.20
15× cheaper
Output
$0.80
19× cheaper
DeepSeek V3.1 is cheaper on both — 15× input, 19× output
Writing DNA
Style Comparison
Similarity
34%
Claude Sonnet 4.5 uses 19.2x more emoji
Claude Sonnet 4.5
DeepSeek V3.1
64%Vocabulary53%
94wSentence Length14w
0.48Hedging0.42
4.9Bold4.0
8.0Lists3.6
0.45Emoji0.02
1.91Headings0.40
0.07Transitions0.22
Based on 20 + 23 text responses
Research
What we learned reading every model
FAQ
