Claude Opus 4.6 vs Claude Sonnet 4

Compare Claude Opus 4.6 and Claude Sonnet 4, both from Anthropic, context windows of 1.0M vs 200K, tested across 33 shared challenges. Updated April 2026.

Which is better, Claude Opus 4.6 or Claude Sonnet 4?

Claude Opus 4.6 and Claude Sonnet 4 are both competitive models. Claude Opus 4.6 costs $5/M input tokens vs $3/M for Claude Sonnet 4. Context windows: 1000K vs 200K tokens. Compare their real outputs side by side below.

Key Differences Between Claude Opus 4.6 and Claude Sonnet 4

Claude Opus 4.6 is made by anthropic while Claude Sonnet 4 is from anthropic. Claude Opus 4.6 has a 1000K token context window compared to Claude Sonnet 4's 200K. On pricing, Claude Opus 4.6 costs $5/M input tokens vs $3/M for Claude Sonnet 4.

Our Verdict
Claude Opus 4.6
Claude Opus 4.6
Claude Sonnet 4
Claude Sonnet 4Runner-up

No community votes yet. On paper, Claude Opus 4.6 has the edge — bigger model tier, newer, bigger context window.

Slight edge
Writing DNA

Style Comparison

Similarity
100%

Claude Sonnet 4 uses 12.0x more transitions

Claude Opus 4.6
Claude Sonnet 4
53%Vocabulary62%
35wSentence Length111w
0.68Hedging0.40
5.2Bold5.0
2.9Lists9.3
0.21Emoji0.88
1.34Headings2.16
0.03Transitions0.33
Based on 23 + 17 text responses
vs

Ask them anything yourself

Claude Opus 4.6Claude Sonnet 4

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
Free preview13 of 58 slides
FAQ

Common questions