Z.AI: GLM 4.5 vs GPT OSS 20B
Compare Z.AI: GLM 4.5 by Zhipu AI against GPT OSS 20B by OpenAI, context windows of 128K vs 131K, tested across 54 shared challenges.
Our Verdict
Z.AI: GLM 4.5
GPT OSS 20B
No community votes yet. On paper, these are closely matched - try both with your actual task to see which fits your workflow.
GPT OSS 20B is 22x cheaper per token — worth considering if cost matters.
Too close to call
API pricing
Cost per 1M tokens
Z.AI: GLM 4.5
Input
$0.60
Output
$2.20
GPT OSS 20B
Input
$0.02
30× cheaper
Output
$0.10
22× cheaper
GPT OSS 20B is cheaper on both — 30× input, 22× output
Writing DNA
Style Comparison
Similarity
52%
Z.AI: GLM 4.5 uses 1.9x more hedging
Z.AI: GLM 4.5
GPT OSS 20B
52%Vocabulary54%
14wSentence Length17w
0.49Hedging0.26
5.5Bold5.9
4.9Lists3.3
0.13Emoji0.10
0.68Headings0.75
0.20Transitions0.32
Based on 21 + 21 text responses
Research
What we learned reading every model
FAQ
