GPT-4.1 vs xAI: Grok 4 Fast (free)
Compare GPT-4.1 by OpenAI against xAI: Grok 4 Fast (free) by xAI, context windows of 1.0M vs 2.0M, tested across 35 shared challenges.
Our Verdict
GPT-4.1
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
GPT-4.1
Input
$2.00
Output
$8.00
xAI: Grok 4 Fast (free)
Input
$0.000
Output
$0.000
Writing DNA
Style Comparison
Similarity
44%
GPT-4.1 uses 23.7x more emoji
GPT-4.1
xAI: Grok 4 Fast (free)
58%Vocabulary65%
19wSentence Length13w
0.38Hedging0.56
9.0Bold1.4
6.1Lists2.5
0.24Emoji0.00
1.01Headings1.58
0.07Transitions0.28
Based on 25 + 14 text responses
Research
What we learned reading every model
FAQ
