Claude Sonnet 5 vs xAI: Grok 4.3
Compare Claude Sonnet 5 by Anthropic against xAI: Grok 4.3 by xAI, context windows of 1.0M vs 1.0M, tested across 54 shared challenges.
Our Verdict
Claude Sonnet 5
xAI: Grok 4.3
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
xAI: Grok 4.3 is 4.0x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Claude Sonnet 5
Input
$2.00
Output
$10.00
xAI: Grok 4.3
Input
$1.25
1.6× cheaper
Output
$2.50
4.0× cheaper
xAI: Grok 4.3 is cheaper on both — 1.6× input, 4.0× output
Writing DNA
Style Comparison
Similarity
46%
Claude Sonnet 5 uses 79.4x more emoji
Claude Sonnet 5
xAI: Grok 4.3
59%Vocabulary62%
35wSentence Length16w
0.53Hedging0.46
3.5Bold2.3
3.5Lists2.5
0.79Emoji0.00
1.25Headings0.34
0.06Transitions0.14
Based on 27 + 27 text responses
Research
What we learned reading every model
FAQ
