Z.AI: GLM 4.5 vs OpenAI: GPT-5.6 Luna Pro
Compare Z.AI: GLM 4.5 by Zhipu AI against OpenAI: GPT-5.6 Luna Pro by OpenAI, context windows of 128K vs 1.1M, tested across 54 shared challenges.
Our Verdict
Z.AI: GLM 4.5
OpenAI: GPT-5.6 Luna Pro
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 4.5
Input
$0.60
1.7× cheaper
Output
$2.20
2.7× cheaper
OpenAI: GPT-5.6 Luna Pro
Input
$1.00
Output
$6.00
Z.AI: GLM 4.5 is cheaper on both — 1.7× input, 2.7× output
Writing DNA
Style Comparison
Similarity
37%
OpenAI: GPT-5.6 Luna Pro uses 4.1x more emoji
Z.AI: GLM 4.5
OpenAI: GPT-5.6 Luna Pro
52%Vocabulary58%
14wSentence Length18w
0.49Hedging0.81
5.5Bold2.9
4.9Lists5.1
0.13Emoji0.54
0.68Headings1.10
0.20Transitions0.09
Based on 21 + 27 text responses
Research
What we learned reading every model
FAQ
