Claude Sonnet 4 vs OpenAI o3
Compare Claude Sonnet 4 by Anthropic against OpenAI o3 by OpenAI, in 9 community votes, claude sonnet 4 wins 83% of head-to-head duels, tested across 54 shared challenges.
Planning: Claude Sonnet 4 wins 100% of votes
Our Verdict
Claude Sonnet 4Winner
OpenAI o3Runner-up
Pick Claude Sonnet 4. In 9 blind votes, Claude Sonnet 4 wins 83% of the time. That's not luck.
Claude Sonnet 4 particularly excels in Planning.
Clear winner
API pricing
Cost per 1M tokens
Claude Sonnet 4
Input
$3.00
3.3× cheaper
Output
$15.00
2.7× cheaper
OpenAI o3
Input
$10.00
Output
$40.00
Claude Sonnet 4 is cheaper on both — 3.3× input, 2.7× output
Writing DNA
Style Comparison
Similarity
40%
Claude Sonnet 4 uses 87.9x more emoji
Claude Sonnet 4
OpenAI o3
62%Vocabulary68%
111wSentence Length14w
0.40Hedging0.26
5.0Bold0.7
9.3Lists3.0
0.88Emoji0.00
2.16Headings0.38
0.33Transitions0.12
Based on 17 + 16 text responses
Research
What we learned reading every model
FAQ
