Claude 3 Sonnet vs Grok 3

Compare Claude 3 Sonnet by Anthropic against Grok 3 by xAI, tested across 12 shared challenges. Updated April 2026.

Which is better, Claude 3 Sonnet or Grok 3?

Claude 3 Sonnet and Grok 3 are both competitive models. Compare their real outputs side by side below.

Key Differences Between Claude 3 Sonnet and Grok 3

Claude 3 Sonnet is made by anthropic while Grok 3 is from xai.

Our Verdict
Grok 3
Grok 3
Claude 3 Sonnet
Claude 3 SonnetRunner-up

No community votes yet. On paper, Grok 3 has the edge — bigger model tier, newer, bigger context window.

Too close to call
Writing DNA

Style Comparison

Similarity
93%

Grok 3 uses 246.4x more bold

Claude 3 Sonnet
Grok 3
48%Vocabulary49%
14wSentence Length18w
0.32Hedging0.94
0.0Bold2.5
3.6Lists3.0
0.00Emoji0.04
0.00Headings0.65
0.38Transitions0.08
Based on 4 + 17 text responses
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Claude 3 SonnetGrok 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
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