Z.ai: GLM 5 vs OpenAI o3
Compare Z.ai: GLM 5 by Zhipu AI against OpenAI o3 by OpenAI, tested across 53 shared challenges.
Our Verdict
Z.ai: GLM 5
OpenAI o3
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 5 is 16x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Z.ai: GLM 5
Input
$0.80
13× cheaper
Output
$2.56
16× cheaper
OpenAI o3
Input
$10.00
Output
$40.00
Z.ai: GLM 5 is cheaper on both — 13× input, 16× output
Writing DNA
Style Comparison
Similarity
40%
Z.ai: GLM 5 uses 9.1x more bold
Z.ai: GLM 5
OpenAI o3
54%Vocabulary68%
17wSentence Length14w
0.37Hedging0.26
6.3Bold0.7
4.7Lists3.0
0.00Emoji0.00
0.60Headings0.38
0.18Transitions0.12
Based on 22 + 16 text responses
Research
What we learned reading every model
FAQ
