Z.AI: GLM 4.5 Air vs OpenAI: GPT-5.6 Luna
Compare Z.AI: GLM 4.5 Air by Zhipu AI against OpenAI: GPT-5.6 Luna by OpenAI, context windows of 128K vs 1.1M, tested across 54 shared challenges.
Our Verdict
Z.AI: GLM 4.5 Air
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.
Z.AI: GLM 4.5 Air is 5.5x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Z.AI: GLM 4.5 Air
Input
$0.20
5.0× cheaper
Output
$1.10
5.5× cheaper
OpenAI: GPT-5.6 Luna
Input
$1.00
Output
$6.00
Z.AI: GLM 4.5 Air is cheaper on both — 5.0× input, 5.5× output
Writing DNA
Style Comparison
Similarity
56%
Z.AI: GLM 4.5 Air uses 9.9x more emoji
Z.AI: GLM 4.5 Air
OpenAI: GPT-5.6 Luna
48%Vocabulary59%
16wSentence Length19w
0.40Hedging0.84
5.4Bold2.7
4.8Lists4.5
0.10Emoji0.00
0.75Headings1.20
0.12Transitions0.10
Based on 15 + 27 text responses
Research
What we learned reading every model
FAQ
