Rival
Sign Up

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 April 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
Claude Opus 4.5
Grok 3
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
80%

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
vs

Ask them anything yourself

Claude Opus 4.5Grok 3

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
Download the free previewor get all 58 slides for $49
FAQ

Common questions

Keep going
Claude Opus 4.5 logoOpenAI o3 logo
Claude Opus 4.5 vs OpenAI o3New provider
Claude Opus 4.5 logoLlama 4 Maverick logo
Claude Opus 4.5 vs Llama 4 MaverickNew provider
Claude Opus 4.5 logoGemini 2.5 Pro (I/O Edition) logo
Claude Opus 4.5 vs Gemini 2.5 Pro (I/O Edition)New provider