Claude Opus 4.8 vs Grok 4.20 Beta
Compare Claude Opus 4.8 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 4.8
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 4.8
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
34%
Claude Opus 4.8 uses 77.6x more emoji
Claude Opus 4.8
Grok 4.20 Beta
60%Vocabulary57%
19wSentence Length20w
0.46Hedging0.35
4.7Bold4.2
3.2Lists3.7
0.78Emoji0.00
1.15Headings0.62
0.04Transitions0.14
Based on 27 + 23 text responses
Research
What we learned reading every model
FAQ
