Claude 3 Opus vs Grok 3

Compare Claude 3 Opus by Anthropic against Grok 3 by xAI, context windows of 200K vs 128K, tested across 11 shared challenges. Updated April 2026.

Which is better, Claude 3 Opus or Grok 3?

Claude 3 Opus and Grok 3 are both competitive models. Context windows: 200K vs 128K tokens. Compare their real outputs side by side below.

Key Differences Between Claude 3 Opus and Grok 3

Claude 3 Opus is made by anthropic while Grok 3 is from xai. Claude 3 Opus has a 200K token context window compared to Grok 3's 128K.

Our Verdict
Claude 3 Opus
Claude 3 Opus
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
99%

Grok 3 uses 246.4x more bold

Claude 3 Opus
Grok 3
54%Vocabulary49%
14wSentence Length18w
0.48Hedging0.94
0.0Bold2.5
3.0Lists3.0
0.00Emoji0.04
0.00Headings0.65
0.06Transitions0.08
Based on 3 + 17 text responses
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Ask them anything yourself

Claude 3 OpusGrok 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
FAQ

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