Z.AI: GLM 4.5 Air vs GPT-4o (Omni)
Compare Z.AI: GLM 4.5 Air by Zhipu AI against GPT-4o (Omni) by OpenAI, context windows of 128K vs 128K, tested across 53 shared challenges.
Our Verdict
Z.AI: GLM 4.5 Air
GPT-4o (Omni)
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 Air is 9.1x 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
9.1× cheaper
GPT-4o (Omni)
Input
$2.50
Output
$10.00
Z.AI: GLM 4.5 Air is cheaper on both — 13× input, 9.1× output
Writing DNA
Style Comparison
Similarity
72%
Z.AI: GLM 4.5 Air uses 3.9x more emoji
Z.AI: GLM 4.5 Air
GPT-4o (Omni)
48%Vocabulary54%
16wSentence Length18w
0.40Hedging0.72
5.4Bold7.3
4.8Lists5.6
0.10Emoji0.03
0.75Headings1.40
0.12Transitions0.26
Based on 15 + 24 text responses
Research
What we learned reading every model
FAQ
