Z.AI: GLM 4.5 vs GPT-5.4
Compare Z.AI: GLM 4.5 by Zhipu AI against GPT-5.4 by OpenAI, context windows of 128K vs 1.1M, tested across 53 shared challenges.
Our Verdict
GPT-5.4
Z.AI: GLM 4.5Runner-up
No community votes yet. On paper, GPT-5.4 has the edge — bigger model tier, newer, bigger context window.
Z.AI: GLM 4.5 is 6.8x cheaper per token — worth considering if cost matters.
Slight edge
API pricing
Cost per 1M tokens
Z.AI: GLM 4.5
Input
$0.60
4.2× cheaper
Output
$2.20
6.8× cheaper
GPT-5.4
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
43%
Z.AI: GLM 4.5 uses 13.1x more emoji
Z.AI: GLM 4.5
GPT-5.4
52%Vocabulary54%
14wSentence Length28w
0.49Hedging0.69
5.5Bold4.1
4.9Lists8.1
0.13Emoji0.00
0.68Headings1.84
0.20Transitions0.02
Based on 21 + 22 text responses
Research
What we learned reading every model
FAQ
