Claude Opus 4.5 vs DeepSeek R1
Compare Claude Opus 4.5 by Anthropic against DeepSeek R1 by DeepSeek, tested across 53 shared challenges. Updated June 2026.
Which is better, Claude Opus 4.5 or DeepSeek R1?
Claude Opus 4.5 and DeepSeek R1 are both competitive models. Compare their real outputs side by side below.
Key Differences Between Claude Opus 4.5 and DeepSeek R1
Claude Opus 4.5 is made by anthropic while DeepSeek R1 is from deepseek.
Our Verdict
Claude Opus 4.5
DeepSeek R1Runner-up
No community votes yet. On paper, Claude Opus 4.5 has the edge — bigger model tier, newer.
Too close to call
API pricing
Cost per 1M tokens
Claude Opus 4.5
Input
—
Output
—
DeepSeek R1
Input
$0.55
Output
$2.19
Writing DNA
Style Comparison
Similarity
50%
DeepSeek R1 uses 5.3x more transitions
Claude Opus 4.5
DeepSeek R1
64%Vocabulary62%
55wSentence Length15w
0.86Hedging0.52
5.8Bold8.0
4.5Lists5.7
0.15Emoji0.04
1.59Headings0.62
0.05Transitions0.28
Based on 24 + 22 text responses
Research
What we learned reading every model
FAQ
Common questions
Keep exploring
