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Claude 3.7 Thinking Sonnet vs Claude Opus 4

Compare Claude 3.7 Thinking Sonnet and Claude Opus 4, both from Anthropic, in 5 community votes, claude 3.7 thinking sonnet wins 75% of head-to-head duels, context windows of 200K vs 200K, tested across 35 shared challenges. Updated April 2026.

Which is better, Claude 3.7 Thinking Sonnet or Claude Opus 4?

Claude 3.7 Thinking Sonnet is the better choice overall, winning 75% of 5 blind community votes on Rival. Claude 3.7 Thinking Sonnet costs $6/M input tokens vs $15/M for Claude Opus 4. Context windows: 200K vs 200K tokens. Compare their real outputs side by side below.

Key Differences Between Claude 3.7 Thinking Sonnet and Claude Opus 4

Claude 3.7 Thinking Sonnet is made by anthropic while Claude Opus 4 is from anthropic. Claude 3.7 Thinking Sonnet has a 200K token context window compared to Claude Opus 4's 200K. On pricing, Claude 3.7 Thinking Sonnet costs $6/M input tokens vs $15/M for Claude Opus 4. In community voting, In 5 community votes, Claude 3.7 Thinking Sonnet wins 75% of head-to-head duels.

In 5 community votes, Claude 3.7 Thinking Sonnet wins 75% of head-to-head duels. Claude 3.7 Thinking Sonnet leads in Web Design. Based on blind community voting from the Rival open dataset of 5+ human preference judgments for this pair.

Web Design: Claude 3.7 Thinking Sonnet wins 100% of votes
Our Verdict
Claude 3.7 Thinking Sonnet
Claude 3.7 Thinking SonnetWinner
Claude Opus 4
Claude Opus 4Runner-up

Pick Claude 3.7 Thinking Sonnet. In 5 blind votes, Claude 3.7 Thinking Sonnet wins 75% of the time. That's not luck.

Claude 3.7 Thinking Sonnet particularly excels in Web Design.

Clear winner
Writing DNA

Style Comparison

Similarity
100%

Claude Opus 4 uses 11.2x more emoji

Claude 3.7 Thinking Sonnet
Claude Opus 4
61%Vocabulary64%
49wSentence Length62w
0.64Hedging0.52
2.2Bold4.4
4.5Lists9.1
0.00Emoji0.11
1.81Headings1.87
0.21Transitions0.27
Based on 21 + 16 text responses
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Claude 3.7 Thinking SonnetClaude Opus 4

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AI Hallucination Index 2026
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