Z.ai: GLM 5.1 vs GPT OSS 20B
Compare Z.ai: GLM 5.1 by Z-ai against GPT OSS 20B by OpenAI, in 2 community votes, z.ai: glm 5.1 wins 100% of head-to-head duels, context windows of 203K vs 131K, tested across 52 shared challenges.
Image Generation: Z.ai: GLM 5.1 wins 100% of votes
Our Verdict
Z.ai: GLM 5.1Winner
GPT OSS 20BRunner-up
Pick Z.ai: GLM 5.1. In 2 blind votes, Z.ai: GLM 5.1 wins 100% of the time. That's not luck.
Z.ai: GLM 5.1 particularly excels in Image Generation. GPT OSS 20B is 44x cheaper per token — worth considering if cost matters.
Clear winner
API pricing
Cost per 1M tokens
Z.ai: GLM 5.1
Input
$1.40
Output
$4.40
GPT OSS 20B
Input
$0.02
70× cheaper
Output
$0.10
44× cheaper
GPT OSS 20B is cheaper on both — 70× input, 44× output
Writing DNA
Style Comparison
Similarity
43%
GPT OSS 20B uses 10.2x more emoji
Z.ai: GLM 5.1
GPT OSS 20B
54%Vocabulary54%
18wSentence Length17w
0.31Hedging0.26
3.6Bold5.9
2.6Lists3.3
0.00Emoji0.10
0.43Headings0.75
0.11Transitions0.32
Based on 27 + 21 text responses
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What we learned reading every model
FAQ
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