Claude Opus 4 vs Z.AI: GLM 4.5 Air
Compare Claude Opus 4 by Anthropic against Z.AI: GLM 4.5 Air by Zhipu AI, in 5 community votes, claude opus 4 wins 60% of head-to-head duels, context windows of 200K vs 128K, tested across 53 shared challenges.
Image Generation: Claude Opus 4 wins 75% of votes
Our Verdict
Claude Opus 4Winner
Z.AI: GLM 4.5 AirRunner-up
Pick Claude Opus 4. In 5 blind votes, Claude Opus 4 wins 60% of the time. That's not luck.
Claude Opus 4 particularly excels in Image Generation. Z.AI: GLM 4.5 Air is 68x cheaper per token — worth considering if cost matters.
Clear winner
API pricing
Cost per 1M tokens
Claude Opus 4
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
59%
Claude Opus 4 uses 3.8x more sentence length
Claude Opus 4
Z.AI: GLM 4.5 Air
64%Vocabulary48%
62wSentence Length16w
0.52Hedging0.40
4.4Bold5.4
9.1Lists4.8
0.11Emoji0.10
1.87Headings0.75
0.27Transitions0.12
Based on 16 + 15 text responses
Research
What we learned reading every model
FAQ
