Z.ai: GLM 5 vs OpenAI: GPT-5.6 Luna
Compare Z.ai: GLM 5 by Zhipu AI against OpenAI: GPT-5.6 Luna by OpenAI, context windows of 203K vs 1.1M, tested across 53 shared challenges.
Our Verdict
Z.ai: GLM 5
OpenAI: GPT-5.6 Luna
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
Input
$0.80
1.3× cheaper
Output
$2.56
2.3× cheaper
OpenAI: GPT-5.6 Luna
Input
$1.00
Output
$6.00
Z.ai: GLM 5 is cheaper on both — 1.3× input, 2.3× output
Writing DNA
Style Comparison
Similarity
39%
Z.ai: GLM 5 uses 2.3x more bold
Z.ai: GLM 5
OpenAI: GPT-5.6 Luna
54%Vocabulary59%
17wSentence Length19w
0.37Hedging0.84
6.3Bold2.7
4.7Lists4.5
0.00Emoji0.00
0.60Headings1.20
0.18Transitions0.10
Based on 22 + 27 text responses
Research
What we learned reading every model
FAQ
