Grok 4.1 Fast
Nothing here. The model returned empty. We stared at it for a while.
Grok 4.1 Fast vs OpenAI o3
Compare Grok 4.1 Fast by xAI against OpenAI o3 by OpenAI, tested across 54 shared challenges. Updated April 2026.
Which is better, Grok 4.1 Fast or OpenAI o3?
Grok 4.1 Fast and OpenAI o3 are both competitive models. Compare their real outputs side by side below.
Key Differences Between Grok 4.1 Fast and OpenAI o3
Grok 4.1 Fast is made by xai while OpenAI o3 is from openai.
Our Verdict
Grok 4.1 Fast
OpenAI o3
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
Writing DNA
Style Comparison
Similarity
99%
Grok 4.1 Fast uses 6.7x more bold
Grok 4.1 Fast
OpenAI o3
67%Vocabulary68%
15wSentence Length14w
0.17Hedging0.26
4.7Bold0.7
3.7Lists3.0
0.00Emoji0.00
0.99Headings0.38
0.14Transitions0.12
Based on 24 + 16 text responses
vsAsk them anything yourself
279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
Free preview13 of 58 slides
FAQ