Claude Opus 5 vs Grok 4.20 Beta
Compare Claude Opus 5 by Anthropic against Grok 4.20 Beta by xAI, context windows of 1.0M vs 2.0M, tested across 53 shared challenges.
Our Verdict
Claude Opus 5
Grok 4.20 Beta
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Grok 4.20 Beta is 4.2x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Claude Opus 5
Input
$5.00
Output
$25.00
Grok 4.20 Beta
Input
$2.00
2.5× cheaper
Output
$6.00
4.2× cheaper
Grok 4.20 Beta is cheaper on both — 2.5× input, 4.2× output
Writing DNA
Style Comparison
Similarity
63%
Claude Opus 5 uses 1.7x more emoji
Claude Opus 5
Grok 4.20 Beta
54%Vocabulary57%
21wSentence Length20w
0.40Hedging0.35
3.9Bold4.2
1.9Lists3.7
0.02Emoji0.00
0.71Headings0.62
0.05Transitions0.14
Based on 27 + 23 text responses
Research
What we learned reading every model
FAQ
