Grok 4.1 Fast
Nothing here. The model returned empty. We stared at it for a while.
Grok 4.1 Fast vs o1
Compare Grok 4.1 Fast by xAI against o1 by OpenAI, tested across 54 shared challenges. Updated April 2026.
Which is better, Grok 4.1 Fast or o1?
Grok 4.1 Fast and o1 are both competitive models. Compare their real outputs side by side below.
Key Differences Between Grok 4.1 Fast and o1
Grok 4.1 Fast is made by xai while o1 is from openai.
Our Verdict
Grok 4.1 Fast
o1Runner-up
No community votes yet. On paper, Grok 4.1 Fast has the edge — bigger model tier, newer.
Too close to call
Writing DNA
Style Comparison
Similarity
98%
o1 uses 4.4x more hedging
Grok 4.1 Fast
o1
67%Vocabulary64%
15wSentence Length16w
0.17Hedging0.76
4.7Bold5.0
3.7Lists2.6
0.00Emoji0.00
0.99Headings0.44
0.14Transitions0.40
Based on 24 + 13 text responses
vsAsk them anything yourself
Some models write identically. You are paying for the brand.
178 models fingerprinted across 32 writing dimensions. Free research.
Model Similarity Index
185x
price gap between models that write identically
178
models
12
clone pairs
32
dimensions
Devstral M / S
95.7%
Qwen3 Coder / Flash
95.6%
GPT-5.4 / Mini
93.3%
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