Claude 3 Sonnet vs Claude 3.7 Thinking Sonnet

Compare Claude 3 Sonnet and Claude 3.7 Thinking Sonnet, both from Anthropic, tested across 13 shared challenges. Updated April 2026.

Which is better, Claude 3 Sonnet or Claude 3.7 Thinking Sonnet?

Claude 3 Sonnet and Claude 3.7 Thinking Sonnet are both competitive models. Claude 3 Sonnet costs $3/M input tokens vs $6/M for Claude 3.7 Thinking Sonnet. Compare their real outputs side by side below.

Key Differences Between Claude 3 Sonnet and Claude 3.7 Thinking Sonnet

Claude 3 Sonnet is made by anthropic while Claude 3.7 Thinking Sonnet is from anthropic. On pricing, Claude 3 Sonnet costs $3/M input tokens vs $6/M for Claude 3.7 Thinking Sonnet.

Our Verdict
Claude 3 Sonnet
Claude 3 Sonnet
Claude 3.7 Thinking Sonnet
Claude 3.7 Thinking Sonnet

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
96%

Claude 3.7 Thinking Sonnet uses 223.5x more bold

Claude 3 Sonnet
Claude 3.7 Thinking Sonnet
48%Vocabulary61%
14wSentence Length49w
0.32Hedging0.64
0.0Bold2.2
3.6Lists4.5
0.00Emoji0.00
0.00Headings1.81
0.38Transitions0.21
Based on 4 + 21 text responses
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Claude 3 SonnetClaude 3.7 Thinking Sonnet

279 AI models invented the same fake scientist.

We read every word. 250 models. 2.14 million words. This is what we found.

AI Hallucination Index 2026
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