xAI: Grok 4 Fast (free) vs xAI: Grok 4.3
Compare xAI: Grok 4 Fast (free) and xAI: Grok 4.3, both from xAI, context windows of 2.0M vs 1.0M, tested across 34 shared challenges.
Our Verdict
xAI: Grok 4 Fast (free)
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.
Too close to call
API pricing
Cost per 1M tokens
xAI: Grok 4 Fast (free)
Input
$0.000
Output
$0.000
xAI: Grok 4.3
Input
$1.25
Output
$2.50
Writing DNA
Style Comparison
Similarity
62%
xAI: Grok 4 Fast (free) uses 4.6x more headings
xAI: Grok 4 Fast (free)
xAI: Grok 4.3
65%Vocabulary62%
13wSentence Length16w
0.56Hedging0.46
1.4Bold2.3
2.5Lists2.5
0.00Emoji0.00
1.58Headings0.34
0.28Transitions0.14
Based on 14 + 27 text responses
Research
What we learned reading every model
FAQ
