Z.ai: GLM 5.1 vs GPT-5.4 Mini
Compare Z.ai: GLM 5.1 by Z-ai against GPT-5.4 Mini by OpenAI, context windows of 203K vs 400K, tested across 52 shared challenges.
Our Verdict
Z.ai: GLM 5.1
GPT-5.4 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-5.4 Mini
Input
$0.75
1.9× cheaper
Output
$4.50
GPT-5.4 Mini wins input (1.9× cheaper)·Z.ai: GLM 5.1
Writing DNA
Style Comparison
Similarity
33%
GPT-5.4 Mini uses 4.9x more headings
Z.ai: GLM 5.1
GPT-5.4 Mini
54%Vocabulary54%
18wSentence Length20w
0.31Hedging0.72
3.6Bold6.0
2.6Lists8.3
0.00Emoji0.00
0.43Headings2.11
0.11Transitions0.04
Based on 27 + 23 text responses
Research
What we learned reading every model
FAQ
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