Claude Sonnet 4.5 vs Claude Opus 4.1
Compare Claude Sonnet 4.5 and Claude Opus 4.1, both from Anthropic, in 23 community votes, claude sonnet 4.5 wins 83% of head-to-head duels, context windows of 200K vs 200K, tested across 42 shared challenges.
Image Generation: Claude Sonnet 4.5 wins 80% of votes
Reasoning: Claude Sonnet 4.5 wins 86% of votes
Our Verdict
Claude Sonnet 4.5Winner
Claude Opus 4.1Runner-up
Pick Claude Sonnet 4.5. In 23 blind votes, Claude Sonnet 4.5 wins 83% of the time. That's not luck.
Claude Sonnet 4.5 particularly excels in Reasoning, Image Generation. Claude Sonnet 4.5 is 5.0x cheaper per token — worth considering if cost matters.
Clear winner
API pricing
Cost per 1M tokens
Claude Sonnet 4.5
Input
$3.00
5.0× cheaper
Output
$15.00
5.0× cheaper
Claude Opus 4.1
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
92%
Claude Opus 4.1 uses 1.7x more transitions
Claude Sonnet 4.5
Claude Opus 4.1
64%Vocabulary61%
94wSentence Length87w
0.48Hedging0.54
4.9Bold5.1
8.0Lists6.7
0.45Emoji0.38
1.91Headings1.68
0.07Transitions0.13
Based on 20 + 17 text responses
Research
What we learned reading every model
FAQ
