Claude 3 Sonnet vs xAI: Grok 4

Compare Claude 3 Sonnet by Anthropic against xAI: Grok 4 by xAI, tested across 13 shared challenges. Updated April 2026.

Which is better, Claude 3 Sonnet or xAI: Grok 4?

Claude 3 Sonnet and xAI: Grok 4 are both competitive models. Claude 3 Sonnet costs $3/M input tokens vs $3/M for xAI: Grok 4. Compare their real outputs side by side below.

Key Differences Between Claude 3 Sonnet and xAI: Grok 4

Claude 3 Sonnet is made by anthropic while xAI: Grok 4 is from xai. On pricing, Claude 3 Sonnet costs $3/M input tokens vs $3/M for xAI: Grok 4.

Our Verdict
Claude 3 Sonnet
Claude 3 Sonnet
xAI: Grok 4
xAI: Grok 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%

xAI: Grok 4 uses 267.9x more bold

Claude 3 Sonnet
xAI: Grok 4
48%Vocabulary53%
14wSentence Length18w
0.32Hedging0.67
0.0Bold2.7
3.6Lists2.7
0.00Emoji0.07
0.00Headings0.86
0.38Transitions0.04
Based on 4 + 21 text responses
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Claude 3 SonnetxAI: Grok 4

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
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