Claude Opus 4.5
Nothing here. The model returned empty. We stared at it for a while.
Claude Opus 4.5 vs Claude Opus 4
Compare Claude Opus 4.5 and Claude Opus 4, both from Anthropic, tested across 35 shared challenges. Updated April 2026.
Which is better, Claude Opus 4.5 or Claude Opus 4?
Claude Opus 4.5 and Claude Opus 4 are both competitive models. Compare their real outputs side by side below.
Key Differences Between Claude Opus 4.5 and Claude Opus 4
Claude Opus 4.5 is made by anthropic while Claude Opus 4 is from anthropic.
Our Verdict
Claude Opus 4.5
Claude Opus 4
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
100%
Claude Opus 4 uses 5.2x more transitions
Claude Opus 4.5
Claude Opus 4
64%Vocabulary64%
55wSentence Length62w
0.86Hedging0.52
5.8Bold4.4
4.5Lists9.1
0.15Emoji0.11
1.59Headings1.87
0.05Transitions0.27
Based on 24 + 16 text responses
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