Grok 3 vs xAI: Grok 4 Fast (free)
Compare Grok 3 and xAI: Grok 4 Fast (free), both from xAI, context windows of 128K vs 2.0M, tested across 34 shared challenges.
Our Verdict
Grok 3
xAI: Grok 4 Fast (free)
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
Grok 3
Input
—
Output
—
xAI: Grok 4 Fast (free)
Input
$0.000
Output
$0.000
Writing DNA
Style Comparison
Similarity
58%
Grok 3 uses 3.9x more emoji
Grok 3
xAI: Grok 4 Fast (free)
49%Vocabulary65%
18wSentence Length13w
0.94Hedging0.56
2.5Bold1.4
3.0Lists2.5
0.04Emoji0.00
0.65Headings1.58
0.08Transitions0.28
Based on 17 + 14 text responses
Research
What we learned reading every model
FAQ
