Z.AI: GLM 4.5 Air vs OpenAI: GPT-5.6 Terra
Compare Z.AI: GLM 4.5 Air by Zhipu AI against OpenAI: GPT-5.6 Terra by OpenAI, context windows of 128K vs 1.1M, tested across 54 shared challenges.
Our Verdict
OpenAI: GPT-5.6 Terra
Z.AI: GLM 4.5 AirRunner-up
No community votes yet. On paper, OpenAI: GPT-5.6 Terra has the edge — newer, bigger context window.
Z.AI: GLM 4.5 Air is 14x 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
13× cheaper
Output
$1.10
14× cheaper
OpenAI: GPT-5.6 Terra
Input
$2.50
Output
$15.00
Z.AI: GLM 4.5 Air is cheaper on both — 13× input, 14× output
Writing DNA
Style Comparison
Similarity
58%
Z.AI: GLM 4.5 Air uses 9.9x more emoji
Z.AI: GLM 4.5 Air
OpenAI: GPT-5.6 Terra
48%Vocabulary57%
16wSentence Length18w
0.40Hedging0.85
5.4Bold2.8
4.8Lists4.6
0.10Emoji0.00
0.75Headings1.12
0.12Transitions0.06
Based on 15 + 27 text responses
Research
What we learned reading every model
FAQ
