Claude 3.7 Sonnet vs xAI: Grok 4

Compare Claude 3.7 Sonnet by Anthropic against xAI: Grok 4 by xAI, in 1 community votes, claude 3.7 sonnet wins 100% of head-to-head duels, context windows of 200K vs 256K, tested across 38 shared challenges. Updated April 2026.

Which is better, Claude 3.7 Sonnet or xAI: Grok 4?

Claude 3.7 Sonnet is the better choice overall, winning 100% of 1 blind community votes on Rival. Claude 3.7 Sonnet costs $3/M input tokens vs $3/M for xAI: Grok 4. Context windows: 200K vs 256K tokens. Compare their real outputs side by side below.

Key Differences Between Claude 3.7 Sonnet and xAI: Grok 4

Claude 3.7 Sonnet is made by anthropic while xAI: Grok 4 is from xai. Claude 3.7 Sonnet has a 200K token context window compared to xAI: Grok 4's 256K. On pricing, Claude 3.7 Sonnet costs $3/M input tokens vs $3/M for xAI: Grok 4. In community voting, In 1 community votes, Claude 3.7 Sonnet wins 100% of head-to-head duels.

In 1 community votes, Claude 3.7 Sonnet wins 100% of head-to-head duels. Based on blind community voting from the Rival open dataset of 1+ human preference judgments for this pair.

Our Verdict
Claude 3.7 Sonnet
Claude 3.7 SonnetWinner
xAI: Grok 4
xAI: Grok 4Runner-up

Pick Claude 3.7 Sonnet. In 1 blind votes, Claude 3.7 Sonnet wins 100% of the time. That's not luck.

Clear winner
Writing DNA

Style Comparison

Similarity
97%

xAI: Grok 4 uses 7.0x more emoji

Claude 3.7 Sonnet
xAI: Grok 4
62%Vocabulary53%
35wSentence Length18w
0.99Hedging0.67
1.2Bold2.7
4.3Lists2.7
0.00Emoji0.07
1.78Headings0.86
0.23Transitions0.04
Based on 13 + 21 text responses
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Claude 3.7 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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