Claude Opus 4 vs Grok 3
Compare Claude Opus 4 by Anthropic against Grok 3 by xAI, context windows of 200K vs 128K, tested across 52 shared challenges. Updated May 2026.
Which is better, Claude Opus 4 or Grok 3?
Claude Opus 4 and Grok 3 are both competitive models. Context windows: 200K vs 128K tokens. Compare their real outputs side by side below.
Key Differences Between Claude Opus 4 and Grok 3
Claude Opus 4 is made by anthropic while Grok 3 is from xai. Claude Opus 4 has a 200K token context window compared to Grok 3's 128K.
API pricing
Per 1M tokens
Claude Opus 4
Input
$15.00
Output
$75.00
Grok 3
Input
—
Output
—
Our Verdict
Claude Opus 4
Grok 3Runner-up
No community votes yet. On paper, Claude Opus 4 has the edge — newer, bigger context window.
Too close to call
Writing DNA
Style Comparison
Similarity
46%
Claude Opus 4 uses 3.5x more sentence length
Claude Opus 4
Grok 3
64%Vocabulary49%
62wSentence Length18w
0.52Hedging0.94
4.4Bold2.5
9.1Lists3.0
0.11Emoji0.04
1.87Headings0.65
0.27Transitions0.08
Based on 16 + 17 text responses
FAQ
