Z.AI: GLM 4.5 Air vs OpenAI o4-mini
Compare Z.AI: GLM 4.5 Air by Zhipu AI against OpenAI o4-mini by OpenAI, tested across 53 shared challenges.
Our Verdict
Z.AI: GLM 4.5 Air
OpenAI o4-miniRunner-up
No community votes yet. On paper, Z.AI: GLM 4.5 Air has the edge — bigger model tier, newer, bigger context window.
Z.AI: GLM 4.5 Air is 4.0x 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
5.5× cheaper
Output
$1.10
4.0× cheaper
OpenAI o4-mini
Input
$1.10
Output
$4.40
Z.AI: GLM 4.5 Air is cheaper on both — 5.5× input, 4.0× output
Writing DNA
Style Comparison
Similarity
28%
Z.AI: GLM 4.5 Air uses 540.4x more bold
Z.AI: GLM 4.5 Air
OpenAI o4-mini
48%Vocabulary73%
16wSentence Length15w
0.40Hedging0.18
5.4Bold0.0
4.8Lists2.1
0.10Emoji0.00
0.75Headings0.00
0.12Transitions0.02
Based on 15 + 10 text responses
Research
What we learned reading every model
FAQ
