Claude 3 Sonnet vs OpenAI o3
Compare Claude 3 Sonnet by Anthropic against OpenAI o3 by OpenAI, tested across 13 shared challenges.
Our Verdict
OpenAI o3
Claude 3 SonnetRunner-up
No community votes yet. On paper, OpenAI o3 has the edge — bigger model tier, newer.
Too close to call
API pricing
Cost per 1M tokens
Claude 3 Sonnet
Input
$3.00
3.3× cheaper
Output
$15.00
2.7× cheaper
OpenAI o3
Input
$10.00
Output
$40.00
Claude 3 Sonnet is cheaper on both — 3.3× input, 2.7× output
Writing DNA
Style Comparison
Similarity
42%
OpenAI o3 uses 69.5x more bold
Claude 3 Sonnet
OpenAI o3
48%Vocabulary68%
14wSentence Length14w
0.32Hedging0.26
0.0Bold0.7
3.6Lists3.0
0.00Emoji0.00
0.00Headings0.38
0.38Transitions0.12
Based on 4 + 16 text responses
Research
What we learned reading every model
FAQ
