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 33 shared challenges. Updated March 2026.

Which is better, Claude Sonnet 4 or OpenAI o3?

Claude Sonnet 4 is the better choice overall, winning 83% of 9 blind community votes on Rival. Claude Sonnet 4 costs $3/M input tokens vs $10/M for OpenAI o3. Compare their real outputs side by side below.

Key Differences Between Claude Sonnet 4 and OpenAI o3

Claude Sonnet 4 is made by anthropic while OpenAI o3 is from openai. On pricing, Claude Sonnet 4 costs $3/M input tokens vs $10/M for OpenAI o3. 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 4
Claude Sonnet 4Winner
OpenAI o3
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.

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