Grok 4.20 Beta vs Grok Code Fast 1
Compare Grok 4.20 Beta and Grok Code Fast 1, both from xAI, context windows of 2.0M vs 256K, tested across 53 shared challenges.
Our Verdict
Grok 4.20 Beta
Grok Code Fast 1Runner-up
No community votes yet. On paper, Grok 4.20 Beta has the edge — bigger model tier, newer, bigger context window.
Grok Code Fast 1 is 4.0x cheaper per token — worth considering if cost matters.
Slight edge
API pricing
Cost per 1M tokens
Grok 4.20 Beta
Input
$2.00
Output
$6.00
Grok Code Fast 1
Input
$0.20
10× cheaper
Output
$1.50
4.0× cheaper
Grok Code Fast 1 is cheaper on both — 10× input, 4.0× output
Writing DNA
Style Comparison
Similarity
51%
Grok Code Fast 1 uses 6.0x more emoji
Grok 4.20 Beta
Grok Code Fast 1
57%Vocabulary60%
20wSentence Length17w
0.35Hedging0.97
4.2Bold2.8
3.7Lists2.5
0.00Emoji0.06
0.62Headings0.89
0.14Transitions0.11
Based on 23 + 23 text responses
Research
What we learned reading every model
FAQ
