Z.AI: GLM 4.5 Air vs xAI: Grok 4.5
Compare Z.AI: GLM 4.5 Air by Zhipu AI against xAI: Grok 4.5 by xAI, context windows of 128K vs 500K, tested across 54 shared challenges.
Our Verdict
xAI: Grok 4.5
Z.AI: GLM 4.5 AirRunner-up
No community votes yet. On paper, xAI: Grok 4.5 has the edge — newer, bigger context window.
Z.AI: GLM 4.5 Air is 5.5x 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
10× cheaper
Output
$1.10
5.5× cheaper
xAI: Grok 4.5
Input
$2.00
Output
$6.00
Z.AI: GLM 4.5 Air is cheaper on both — 10× input, 5.5× output
Writing DNA
Style Comparison
Similarity
43%
Z.AI: GLM 4.5 Air uses 2.2x more bold
Z.AI: GLM 4.5 Air
xAI: Grok 4.5
48%Vocabulary61%
16wSentence Length16w
0.40Hedging0.23
5.4Bold2.5
4.8Lists2.4
0.10Emoji0.09
0.75Headings0.48
0.12Transitions0.06
Based on 15 + 27 text responses
Research
What we learned reading every model
FAQ
