xAI: Grok 4 Fast (free) vs MoonshotAI: Kimi K3
Compare xAI: Grok 4 Fast (free) by xAI against MoonshotAI: Kimi K3 by Moonshot AI, context windows of 2.0M vs 1.0M, tested across 34 shared challenges.
Our Verdict
xAI: Grok 4 Fast (free)
MoonshotAI: Kimi K3
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
MoonshotAI: Kimi K3
Input
$3.00
Output
$15.00
Writing DNA
Style Comparison
Similarity
61%
MoonshotAI: Kimi K3 uses 77.9x more emoji
xAI: Grok 4 Fast (free)
MoonshotAI: Kimi K3
65%Vocabulary58%
13wSentence Length21w
0.56Hedging0.46
1.4Bold3.6
2.5Lists3.4
0.00Emoji0.78
1.58Headings0.89
0.28Transitions0.17
Based on 14 + 27 text responses
Research
What we learned reading every model
FAQ
