Claude Opus 4.6 vs Claude Opus 4

Compare Claude Opus 4.6 and Claude Opus 4, both from Anthropic, context windows of 1.0M vs 200K, tested across 35 shared challenges. Updated April 2026.

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

Claude Opus 4.6 and Claude Opus 4 are both competitive models. Claude Opus 4.6 costs $5/M input tokens vs $15/M for Claude Opus 4. Context windows: 1000K vs 200K tokens. Compare their real outputs side by side below.

Key Differences Between Claude Opus 4.6 and Claude Opus 4

Claude Opus 4.6 is made by anthropic while Claude Opus 4 is from anthropic. Claude Opus 4.6 has a 1000K token context window compared to Claude Opus 4's 200K. On pricing, Claude Opus 4.6 costs $5/M input tokens vs $15/M for Claude Opus 4.

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

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

Claude Opus 4.6 is 3.0x cheaper per token — worth considering if cost matters.

Too close to call
Writing DNA

Style Comparison

Similarity
100%

Claude Opus 4 uses 9.8x more transitions

Claude Opus 4.6
Claude Opus 4
53%Vocabulary64%
35wSentence Length62w
0.68Hedging0.52
5.2Bold4.4
2.9Lists9.1
0.21Emoji0.11
1.34Headings1.87
0.03Transitions0.27
Based on 23 + 16 text responses
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Claude Opus 4.6Claude Opus 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
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