Z.AI: GLM 4.5 vs OpenAI: GPT-5.6 Terra
Compare Z.AI: GLM 4.5 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 4.5Runner-up
No community votes yet. On paper, OpenAI: GPT-5.6 Terra has the edge — newer, bigger context window.
Z.AI: GLM 4.5 is 6.8x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Z.AI: GLM 4.5
Input
$0.60
4.2× cheaper
Output
$2.20
6.8× cheaper
OpenAI: GPT-5.6 Terra
Input
$2.50
Output
$15.00
Z.AI: GLM 4.5 is cheaper on both — 4.2× input, 6.8× output
Writing DNA
Style Comparison
Similarity
49%
Z.AI: GLM 4.5 uses 13.1x more emoji
Z.AI: GLM 4.5
OpenAI: GPT-5.6 Terra
52%Vocabulary57%
14wSentence Length18w
0.49Hedging0.85
5.5Bold2.8
4.9Lists4.6
0.13Emoji0.00
0.68Headings1.12
0.20Transitions0.06
Based on 21 + 27 text responses
Research
What we learned reading every model
FAQ
