Claude Sonnet 4 vs Z.AI: GLM 4.5
Compare Claude Sonnet 4 by Anthropic against Z.AI: GLM 4.5 by Zhipu AI, in 30 community votes, z.ai: glm 4.5 wins 70% of head-to-head duels, context windows of 200K vs 128K, tested across 54 shared challenges.
Web Design: Z.AI: GLM 4.5 wins 71% of votes
Image Generation: Z.AI: GLM 4.5 wins 67% of votes
Reasoning: Z.AI: GLM 4.5 wins 100% of votes
Our Verdict
Z.AI: GLM 4.5Winner
Claude Sonnet 4Runner-up
Pick Z.AI: GLM 4.5. In 30 blind votes, Z.AI: GLM 4.5 wins 70% of the time. That's not luck.
Z.AI: GLM 4.5 particularly excels in Reasoning, Web Design, Image Generation. Z.AI: GLM 4.5 is 6.8x cheaper per token — worth considering if cost matters.
Clear winner
API pricing
Cost per 1M tokens
Claude Sonnet 4
Input
$3.00
Output
$15.00
Z.AI: GLM 4.5
Input
$0.60
5.0× cheaper
Output
$2.20
6.8× cheaper
Z.AI: GLM 4.5 is cheaper on both — 5.0× input, 6.8× output
Writing DNA
Style Comparison
Similarity
44%
Claude Sonnet 4 uses 7.8x more sentence length
Claude Sonnet 4
Z.AI: GLM 4.5
62%Vocabulary52%
111wSentence Length14w
0.40Hedging0.49
5.0Bold5.5
9.3Lists4.9
0.88Emoji0.13
2.16Headings0.68
0.33Transitions0.20
Based on 17 + 21 text responses
Research
What we learned reading every model
FAQ
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