Claude Sonnet 4.5 vs Grok 3
Compare Claude Sonnet 4.5 by Anthropic against Grok 3 by xAI, context windows of 200K vs 128K, tested across 42 shared challenges. Updated May 2026.
Which is better, Claude Sonnet 4.5 or Grok 3?
Claude Sonnet 4.5 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 Sonnet 4.5 and Grok 3
Claude Sonnet 4.5 is made by anthropic while Grok 3 is from xai. Claude Sonnet 4.5 has a 200K token context window compared to Grok 3's 128K.
API pricing
Per 1M tokens
Claude Sonnet 4.5
Input
$3.00
Output
$15.00
Grok 3
Input
—
Output
—
Our Verdict
Claude Sonnet 4.5
Grok 3
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
Too close to call
Writing DNA
Style Comparison
Similarity
30%
Claude Sonnet 4.5 uses 11.5x more emoji
Claude Sonnet 4.5
Grok 3
64%Vocabulary49%
94wSentence Length18w
0.48Hedging0.94
4.9Bold2.5
8.0Lists3.0
0.45Emoji0.04
1.91Headings0.65
0.07Transitions0.08
Based on 20 + 17 text responses
FAQ
