Claude 3 Opus vs Claude 3.7 Sonnet

Compare Claude 3 Opus and Claude 3.7 Sonnet, both from Anthropic, context windows of 200K vs 200K, tested across 12 shared challenges. Updated April 2026.

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

Claude 3 Opus and Claude 3.7 Sonnet are both competitive models. Claude 3 Opus costs $15/M input tokens vs $3/M for Claude 3.7 Sonnet. Context windows: 200K vs 200K tokens. Compare their real outputs side by side below.

Key Differences Between Claude 3 Opus and Claude 3.7 Sonnet

Claude 3 Opus is made by anthropic while Claude 3.7 Sonnet is from anthropic. Claude 3 Opus has a 200K token context window compared to Claude 3.7 Sonnet's 200K. On pricing, Claude 3 Opus costs $15/M input tokens vs $3/M for Claude 3.7 Sonnet.

Our Verdict
Claude 3 Opus
Claude 3 Opus
Claude 3.7 Sonnet
Claude 3.7 Sonnet

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

Claude 3.7 Sonnet is 5.0x cheaper per token — worth considering if cost matters.

Too close to call
Writing DNA

Style Comparison

Similarity
84%

Claude 3.7 Sonnet uses 121.0x more bold

Claude 3 Opus
Claude 3.7 Sonnet
54%Vocabulary62%
14wSentence Length35w
0.48Hedging0.99
0.0Bold1.2
3.0Lists4.3
0.00Emoji0.00
0.00Headings1.78
0.06Transitions0.23
Based on 3 + 13 text responses
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Claude 3 OpusClaude 3.7 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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