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OpenAI o3 vs Claude Sonnet 4.6

Compare OpenAI o3 by OpenAI against Claude Sonnet 4.6 by Anthropic, tested across 53 shared challenges. Updated April 2026.

Which is better, OpenAI o3 or Claude Sonnet 4.6?

OpenAI o3 and Claude Sonnet 4.6 are both competitive models. OpenAI o3 costs $10/M input tokens vs $3/M for Claude Sonnet 4.6. Compare their real outputs side by side below.

Key Differences Between OpenAI o3 and Claude Sonnet 4.6

OpenAI o3 is made by openai while Claude Sonnet 4.6 is from anthropic. On pricing, OpenAI o3 costs $10/M input tokens vs $3/M for Claude Sonnet 4.6.

Our Verdict
OpenAI o3
OpenAI o3
Claude Sonnet 4.6
Claude Sonnet 4.6

No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.

Too close to call
Writing DNA

Style Comparison

Similarity
93%

Claude Sonnet 4.6 uses 19.1x more emoji

OpenAI o3
Claude Sonnet 4.6
68%Vocabulary56%
14wSentence Length36w
0.26Hedging0.53
0.7Bold5.1
3.0Lists3.4
0.00Emoji0.19
0.38Headings2.10
0.12Transitions0.02
Based on 16 + 23 text responses
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OpenAI o3Claude Sonnet 4.6
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