OpenAI o3
Nothing here. The model returned empty. We stared at it for a while.
OpenAI o3 vs Claude Sonnet 4
Compare OpenAI o3 by OpenAI against Claude Sonnet 4 by Anthropic, in 9 community votes, claude sonnet 4 wins 83% of head-to-head duels, tested across 34 shared challenges. Updated April 2026.
Which is better, OpenAI o3 or Claude Sonnet 4?
Claude Sonnet 4 is the better choice overall, winning 83% of 9 blind community votes on Rival. OpenAI o3 costs $10/M input tokens vs $3/M for Claude Sonnet 4. Compare their real outputs side by side below.
Key Differences Between OpenAI o3 and Claude Sonnet 4
OpenAI o3 is made by openai while Claude Sonnet 4 is from anthropic. On pricing, OpenAI o3 costs $10/M input tokens vs $3/M for Claude Sonnet 4. In community voting, In 9 community votes, Claude Sonnet 4 wins 83% of head-to-head duels.
In 9 community votes, Claude Sonnet 4 wins 83% of head-to-head duels. Claude Sonnet 4 leads in Planning. Based on blind community voting from the Rival open dataset of 9+ human preference judgments for this pair.
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
Writing DNA
Style Comparison
Similarity
92%
Claude Sonnet 4 uses 87.9x more emoji
OpenAI o3
Claude Sonnet 4
68%Vocabulary62%
14wSentence Length111w
0.26Hedging0.40
0.7Bold5.0
3.0Lists9.3
0.00Emoji0.88
0.38Headings2.16
0.12Transitions0.33
Based on 16 + 17 text responses
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