xAI: Grok 4 Fast (free) vs Polaris Alpha
Compare xAI: Grok 4 Fast (free) by xAI against Polaris Alpha by OpenRouter, context windows of 2.0M vs 256K, tested across 35 shared challenges.
Our Verdict
xAI: Grok 4 Fast (free)
Polaris Alpha
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
Polaris Alpha
Input
$0.000
Output
$0.000
Writing DNA
Style Comparison
Similarity
53%
xAI: Grok 4 Fast (free) uses 138.0x more bold
xAI: Grok 4 Fast (free)
Polaris Alpha
65%Vocabulary65%
13wSentence Length15w
0.56Hedging0.23
1.4Bold0.0
2.5Lists11.3
0.00Emoji0.00
1.58Headings0.00
0.28Transitions0.04
Based on 14 + 14 text responses
Research
What we learned reading every model
FAQ
