Z.AI: GLM 4.5 vs xAI: Grok 4.5
Compare Z.AI: GLM 4.5 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 4.5Runner-up
No community votes yet. On paper, xAI: Grok 4.5 has the edge — newer, bigger context window.
Too close to call
API pricing
Cost per 1M tokens
Z.AI: GLM 4.5
Input
$0.60
3.3× cheaper
Output
$2.20
2.7× cheaper
xAI: Grok 4.5
Input
$2.00
Output
$6.00
Z.AI: GLM 4.5 is cheaper on both — 3.3× input, 2.7× output
Writing DNA
Style Comparison
Similarity
50%
Z.AI: GLM 4.5 uses 3.6x more transitions
Z.AI: GLM 4.5
xAI: Grok 4.5
52%Vocabulary61%
14wSentence Length16w
0.49Hedging0.23
5.5Bold2.5
4.9Lists2.4
0.13Emoji0.09
0.68Headings0.48
0.20Transitions0.06
Based on 21 + 27 text responses
Research
What we learned reading every model
FAQ
