Z.AI: GLM 4.5 vs GPT-4.5
Compare Z.AI: GLM 4.5 by Zhipu AI against GPT-4.5 by OpenAI, context windows of 128K vs 128K, tested across 25 shared challenges.
Our Verdict
Z.AI: GLM 4.5
GPT-4.5
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 is 68x 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
125× cheaper
Output
$2.20
68× cheaper
GPT-4.5
Input
$75.00
Output
$150.00
Z.AI: GLM 4.5 is cheaper on both — 125× input, 68× output
Writing DNA
Style Comparison
Similarity
71%
Z.AI: GLM 4.5 uses 13.1x more emoji
Z.AI: GLM 4.5
GPT-4.5
52%Vocabulary63%
14wSentence Length16w
0.49Hedging0.57
5.5Bold4.7
4.9Lists6.4
0.13Emoji0.00
0.68Headings1.30
0.20Transitions0.54
Based on 21 + 11 text responses
Research
What we learned reading every model
FAQ
Common questions
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