Claude 3 Opus vs Z.AI: GLM 4.5 Air
Compare Claude 3 Opus by Anthropic against Z.AI: GLM 4.5 Air by Zhipu AI, context windows of 200K vs 128K, tested across 12 shared challenges.
Our Verdict
Claude 3 Opus
Z.AI: GLM 4.5 AirRunner-up
No community votes yet. On paper, Claude 3 Opus has the edge — bigger model tier, bigger context window.
Z.AI: GLM 4.5 Air is 68x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Claude 3 Opus
Input
$15.00
Output
$75.00
Z.AI: GLM 4.5 Air
Input
$0.20
75× cheaper
Output
$1.10
68× cheaper
Z.AI: GLM 4.5 Air is cheaper on both — 75× input, 68× output
Writing DNA
Style Comparison
Similarity
40%
Z.AI: GLM 4.5 Air uses 540.4x more bold
Claude 3 Opus
Z.AI: GLM 4.5 Air
54%Vocabulary48%
14wSentence Length16w
0.48Hedging0.40
0.0Bold5.4
3.0Lists4.8
0.00Emoji0.10
0.00Headings0.75
0.06Transitions0.12
Based on 3 + 15 text responses
Research
What we learned reading every model
FAQ
