Claude 3 Sonnet vs Claude Opus 5
Compare Claude 3 Sonnet and Claude Opus 5, both from Anthropic, tested across 13 shared challenges.
Our Verdict
Claude Opus 5
Claude 3 SonnetRunner-up
No community votes yet. On paper, Claude Opus 5 has the edge — bigger model tier, newer, bigger context window.
Too close to call
API pricing
Cost per 1M tokens
Claude 3 Sonnet
Input
$3.00
1.7× cheaper
Output
$15.00
1.7× cheaper
Claude Opus 5
Input
$5.00
Output
$25.00
Claude 3 Sonnet is cheaper on both — 1.7× input, 1.7× output
Writing DNA
Style Comparison
Similarity
48%
Claude Opus 5 uses 394.1x more bold
Claude 3 Sonnet
Claude Opus 5
48%Vocabulary54%
14wSentence Length21w
0.32Hedging0.40
0.0Bold3.9
3.6Lists1.9
0.00Emoji0.02
0.00Headings0.71
0.38Transitions0.05
Based on 4 + 27 text responses
Research
What we learned reading every model
FAQ
