Claude Opus 4.5 vs Grok 3
Compare Claude Opus 4.5 by Anthropic against Grok 3 by xAI, tested across 53 shared challenges. Updated June 2026.
Which is better, Claude Opus 4.5 or Grok 3?
Claude Opus 4.5 and Grok 3 are both competitive models. Compare their real outputs side by side below.
Key Differences Between Claude Opus 4.5 and Grok 3
Claude Opus 4.5 is made by anthropic while Grok 3 is from xai.
Our Verdict
Claude Opus 4.5
Grok 3
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
36%
Claude Opus 4.5 uses 3.8x more emoji
Claude Opus 4.5
Grok 3
64%Vocabulary49%
55wSentence Length18w
0.86Hedging0.94
5.8Bold2.5
4.5Lists3.0
0.15Emoji0.04
1.59Headings0.65
0.05Transitions0.08
Based on 24 + 17 text responses
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