Claude Opus 4.1 vs xAI: Grok 4

Compare Claude Opus 4.1 by Anthropic against xAI: Grok 4 by xAI, in 17 community votes, claude opus 4.1 wins 71% of head-to-head duels, context windows of 200K vs 256K, tested across 27 shared challenges. Updated April 2026.

Which is better, Claude Opus 4.1 or xAI: Grok 4?

Claude Opus 4.1 is the better choice overall, winning 71% of 17 blind community votes on Rival. Claude Opus 4.1 costs $15/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 Opus 4.1 and xAI: Grok 4

Claude Opus 4.1 is made by anthropic while xAI: Grok 4 is from xai. Claude Opus 4.1 has a 200K token context window compared to xAI: Grok 4's 256K. On pricing, Claude Opus 4.1 costs $15/M input tokens vs $3/M for xAI: Grok 4. In community voting, In 17 community votes, Claude Opus 4.1 wins 71% of head-to-head duels.

In 17 community votes, Claude Opus 4.1 wins 71% of head-to-head duels. Claude Opus 4.1 leads in Web Design. Based on blind community voting from the Rival open dataset of 17+ human preference judgments for this pair.

Image Generation: Claude Opus 4.1 and xAI: Grok 4 are tied
Web Design: Claude Opus 4.1 wins 100% of votes
Analysis: Claude Opus 4.1 and xAI: Grok 4 are tied
Our Verdict
Claude Opus 4.1
Claude Opus 4.1Winner
xAI: Grok 4
xAI: Grok 4Runner-up

Pick Claude Opus 4.1. In 17 blind votes, Claude Opus 4.1 wins 71% of the time. That's not luck.

Claude Opus 4.1 particularly excels in Web Design. xAI: Grok 4 is 5.0x cheaper per token — worth considering if cost matters.

Clear winner
Writing DNA

Style Comparison

Similarity
97%

Claude Opus 4.1 uses 5.5x more emoji

Claude Opus 4.1
xAI: Grok 4
61%Vocabulary53%
87wSentence Length18w
0.54Hedging0.67
5.1Bold2.7
6.7Lists2.7
0.38Emoji0.07
1.68Headings0.86
0.13Transitions0.04
Based on 17 + 21 text responses
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Claude Opus 4.1xAI: Grok 4

279 AI models invented the same fake scientist.

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AI Hallucination Index 2026
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