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OpenAI o3 vs Claude 3.7 Thinking Sonnet

Compare OpenAI o3 by OpenAI against Claude 3.7 Thinking Sonnet by Anthropic, in 41 community votes, claude 3.7 thinking sonnet wins 79% of head-to-head duels, tested across 54 shared challenges. Updated March 2026.

Which is better, OpenAI o3 or Claude 3.7 Thinking Sonnet?

Claude 3.7 Thinking Sonnet is the better choice overall, winning 79% of 41 blind community votes on Rival. OpenAI o3 costs $10/M input tokens vs $6/M for Claude 3.7 Thinking Sonnet. Compare their real outputs side by side below.

Key Differences Between OpenAI o3 and Claude 3.7 Thinking Sonnet

OpenAI o3 is made by openai while Claude 3.7 Thinking Sonnet is from anthropic. On pricing, OpenAI o3 costs $10/M input tokens vs $6/M for Claude 3.7 Thinking Sonnet. In community voting, In 41 community votes, Claude 3.7 Thinking Sonnet wins 79% of head-to-head duels.

In 41 community votes, Claude 3.7 Thinking Sonnet wins 79% of head-to-head duels. Claude 3.7 Thinking Sonnet leads in Web Design, Image Generation, Reasoning. Based on blind community voting from the Rival open dataset of 41+ human preference judgments for this pair.

Web Design: Claude 3.7 Thinking Sonnet wins 73% of votes
Image Generation: Claude 3.7 Thinking Sonnet wins 83% of votes
Reasoning: Claude 3.7 Thinking Sonnet wins 80% of votes
Conversation: Claude 3.7 Thinking Sonnet wins 100% of votes
Our Verdict
Claude 3.7 Thinking Sonnet
Claude 3.7 Thinking SonnetWinner
OpenAI o3
OpenAI o3Runner-up

Pick Claude 3.7 Thinking Sonnet. In 41 blind votes, Claude 3.7 Thinking Sonnet wins 79% of the time. That's not luck.

Claude 3.7 Thinking Sonnet particularly excels in Conversation, Image Generation, Reasoning.

Clear winner
Writing DNA

Style Comparison

Similarity
93%

Claude 3.7 Thinking Sonnet uses 4.8x more headings

OpenAI o3
Claude 3.7 Thinking Sonnet
68%Vocabulary61%
14wSentence Length49w
0.26Hedging0.64
0.7Bold2.2
3.0Lists4.5
0.00Emoji0.00
0.38Headings1.81
0.12Transitions0.21
Based on 16 + 21 text responses
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OpenAI o3Claude 3.7 Thinking Sonnet
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