Z.ai: GLM 5.1
Nothing here. The model returned empty. We stared at it for a while.
Z.ai: GLM 5.1 vs Grok 4.1 Fast
Compare Z.ai: GLM 5.1 by Z-ai against Grok 4.1 Fast by xAI, tested across 53 shared challenges. Updated April 2026.
Which is better, Z.ai: GLM 5.1 or Grok 4.1 Fast?
Z.ai: GLM 5.1 and Grok 4.1 Fast are both competitive models. Compare their real outputs side by side below.
Key Differences Between Z.ai: GLM 5.1 and Grok 4.1 Fast
Z.ai: GLM 5.1 is made by z-ai while Grok 4.1 Fast is from xai.
Our Verdict
Grok 4.1 Fast
Z.ai: GLM 5.1Runner-up
No community votes yet. On paper, Grok 4.1 Fast has the edge — bigger model tier, major provider backing.
Too close to call
Writing DNA
Style Comparison
Similarity
100%
Grok 4.1 Fast uses 2.3x more headings
Z.ai: GLM 5.1
Grok 4.1 Fast
54%Vocabulary67%
18wSentence Length15w
0.31Hedging0.17
3.6Bold4.7
2.6Lists3.7
0.00Emoji0.00
0.43Headings0.99
0.11Transitions0.14
Based on 27 + 24 text responses
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279 AI models invented the same fake scientist.
We read every word. 250 models. 2.14 million words. This is what we found.
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