Claude Sonnet 4 vs Z.AI: GLM 4.5 Air
Compare Claude Sonnet 4 by Anthropic against Z.AI: GLM 4.5 Air by Zhipu AI, in 17 community votes, claude sonnet 4 and z.ai: glm 4.5 air are closely matched, context windows of 200K vs 128K, tested across 53 shared challenges.
Image Generation: Z.AI: GLM 4.5 Air wins 83% of votes
Web Design: Z.AI: GLM 4.5 Air wins 60% of votes
Reasoning: Claude Sonnet 4 wins 100% of votes
Our Verdict
Claude Sonnet 4
Z.AI: GLM 4.5 Air
Too close to call. Pick based on your use case.
Pick Claude Sonnet 4 for Reasoning. Pick Z.AI: GLM 4.5 Air for Image Generation, Web Design. Z.AI: GLM 4.5 Air is 14x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Claude Sonnet 4
Input
$3.00
Output
$15.00
Z.AI: GLM 4.5 Air
Input
$0.20
15× cheaper
Output
$1.10
14× cheaper
Z.AI: GLM 4.5 Air is cheaper on both — 15× input, 14× output
Writing DNA
Style Comparison
Similarity
47%
Claude Sonnet 4 uses 8.9x more emoji
Claude Sonnet 4
Z.AI: GLM 4.5 Air
62%Vocabulary48%
111wSentence Length16w
0.40Hedging0.40
5.0Bold5.4
9.3Lists4.8
0.88Emoji0.10
2.16Headings0.75
0.33Transitions0.12
Based on 17 + 15 text responses
Research
What we learned reading every model
FAQ
