Claude Opus 4
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Claude Opus 4 vs Grok Code Fast 1
Compare Claude Opus 4 by Anthropic against Grok Code Fast 1 by xAI, in 5 community votes, claude opus 4 wins 80% of head-to-head duels, context windows of 200K vs 256K, tested across 35 shared challenges. Updated April 2026.
Which is better, Claude Opus 4 or Grok Code Fast 1?
Claude Opus 4 is the better choice overall, winning 80% of 5 blind community votes on Rival. Claude Opus 4 costs $15/M input tokens vs $0.2/M for Grok Code Fast 1. Context windows: 200K vs 256K tokens. Compare their real outputs side by side below.
Key Differences Between Claude Opus 4 and Grok Code Fast 1
Claude Opus 4 is made by anthropic while Grok Code Fast 1 is from xai. Claude Opus 4 has a 200K token context window compared to Grok Code Fast 1's 256K. On pricing, Claude Opus 4 costs $15/M input tokens vs $0.2/M for Grok Code Fast 1. In community voting, In 5 community votes, Claude Opus 4 wins 80% of head-to-head duels.
In 5 community votes, Claude Opus 4 wins 80% of head-to-head duels. Claude Opus 4 leads in Image Generation. Based on blind community voting from the Rival open dataset of 5+ human preference judgments for this pair.
Image Generation: Claude Opus 4 wins 100% of votes
Our Verdict
Claude Opus 4Winner
Grok Code Fast 1Runner-up
Pick Claude Opus 4. In 5 blind votes, Claude Opus 4 wins 80% of the time. That's not luck.
Claude Opus 4 particularly excels in Image Generation. Grok Code Fast 1 is 50x cheaper per token — worth considering if cost matters.
Clear winner
Writing DNA
Style Comparison
Similarity
85%
Claude Opus 4 uses 3.6x more lists
Claude Opus 4
Grok Code Fast 1
64%Vocabulary60%
62wSentence Length17w
0.52Hedging0.97
4.4Bold2.8
9.1Lists2.5
0.11Emoji0.06
1.87Headings0.89
0.27Transitions0.11
Based on 16 + 23 text responses
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