Claude Sonnet 4.5 vs Claude Opus 4
Compare Claude Sonnet 4.5 and Claude Opus 4, both from Anthropic, context windows of 200K vs 200K, tested across 42 shared challenges.
Our Verdict
Claude Sonnet 4.5
Claude Opus 4
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Claude Sonnet 4.5 is 5.0x 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
5.0× cheaper
Output
$15.00
5.0× cheaper
Claude Opus 4
Input
$15.00
Output
$75.00
Claude Sonnet 4.5 is cheaper on both — 5.0× input, 5.0× output
Writing DNA
Style Comparison
Similarity
72%
Claude Sonnet 4.5 uses 4.0x more emoji
Claude Sonnet 4.5
Claude Opus 4
64%Vocabulary64%
94wSentence Length62w
0.48Hedging0.52
4.9Bold4.4
8.0Lists9.1
0.45Emoji0.11
1.91Headings1.87
0.07Transitions0.27
Based on 20 + 16 text responses
Research
What we learned reading every model
FAQ
