Z.AI: GLM 4.5 Air vs GPT-5.4 Pro
Compare Z.AI: GLM 4.5 Air by Zhipu AI against GPT-5.4 Pro by OpenAI, context windows of 128K vs 1.1M, tested across 18 shared challenges.
Our Verdict
GPT-5.4 Pro
Z.AI: GLM 4.5 AirRunner-up
No community votes yet. On paper, GPT-5.4 Pro has the edge — bigger model tier, newer, bigger context window.
Z.AI: GLM 4.5 Air is 164x cheaper per token — worth considering if cost matters.
Slight edge
API pricing
Cost per 1M tokens
Z.AI: GLM 4.5 Air
Input
$0.20
150× cheaper
Output
$1.10
164× cheaper
GPT-5.4 Pro
Input
$30.00
Output
$180.00
Z.AI: GLM 4.5 Air is cheaper on both — 150× input, 164× output
Writing DNA
Style Comparison
Similarity
66%
Z.AI: GLM 4.5 Air uses 9.9x more emoji
Z.AI: GLM 4.5 Air
GPT-5.4 Pro
48%Vocabulary50%
16wSentence Length35w
0.40Hedging0.70
5.4Bold7.5
4.8Lists8.3
0.10Emoji0.00
0.75Headings2.52
0.12Transitions0.01
Based on 15 + 12 text responses
Research
What we learned reading every model
FAQ
