Z.ai: GLM 5.1 vs GPT-4.1 Mini
Compare Z.ai: GLM 5.1 by Z-ai against GPT-4.1 Mini by OpenAI, context windows of 203K vs 1.0M, tested across 52 shared challenges.
Our Verdict
Z.ai: GLM 5.1
GPT-4.1 Mini
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
Z.ai: GLM 5.1
Input
$1.40
Output
$4.40
GPT-4.1 Mini
Input
$0.40
3.5× cheaper
Output
$1.60
2.8× cheaper
GPT-4.1 Mini is cheaper on both — 3.5× input, 2.8× output
Writing DNA
Style Comparison
Similarity
29%
GPT-4.1 Mini uses 1.9x more lists
Z.ai: GLM 5.1
GPT-4.1 Mini
54%Vocabulary59%
18wSentence Length19w
0.31Hedging0.46
3.6Bold4.7
2.6Lists4.9
0.00Emoji0.00
0.43Headings0.76
0.11Transitions0.17
Based on 27 + 23 text responses
Research
What we learned reading every model
FAQ
