Claude Opus 4.1 vs Claude Sonnet 5
Compare Claude Opus 4.1 and Claude Sonnet 5, both from Anthropic, context windows of 200K vs 1.0M, tested across 53 shared challenges.
Our Verdict
Claude Opus 4.1
Claude Sonnet 5
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Claude Sonnet 5 is 7.5x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Claude Opus 4.1
Input
$15.00
Output
$75.00
Claude Sonnet 5
Input
$2.00
7.5× cheaper
Output
$10.00
7.5× cheaper
Claude Sonnet 5 is cheaper on both — 7.5× input, 7.5× output
Writing DNA
Style Comparison
Similarity
65%
Claude Opus 4.1 uses 2.5x more sentence length
Claude Opus 4.1
Claude Sonnet 5
61%Vocabulary59%
87wSentence Length35w
0.54Hedging0.53
5.1Bold3.5
6.7Lists3.5
0.38Emoji0.79
1.68Headings1.25
0.13Transitions0.06
Based on 17 + 27 text responses
Research
What we learned reading every model
FAQ
