1littlecoder · 2026-08-26 · notable
1littlecoder — 'Ox Alpha is GLM 5.3 Flash!!!'
1littlecoder's new video covers the reveal that Ox Alpha, the free stealth model on OpenRouter, is Z.ai's GLM-5.3-Flash. The weights are now on Hugging Face under an MIT license.
1littlecoder walks through the reveal that OpenRouter's free stealth model Ox Alpha is Z.ai's GLM-5.3-Flash.
What is it?
Ox Alpha is GLM-5.3-Flash — that is the reveal 1littlecoder covers in this upload. The model had been sitting on OpenRouter under the provider name "Stealth", free to call and with no named owner. Z.ai has now published the weights on Hugging Face under an MIT license.
How does it work?
The model behind the code name has 320 billion total parameters and 18 billion active ones, and Z.ai calls it the first natively multimodal model in the GLM-5 series. Its base model was trained from scratch on a 30-trillion-token multimodal corpus, mixes sparse and linear attention to cut the cost of serving long contexts, and adds Manifold-Constrained Hyper-Connections.
Why does it matter?
Everyone who tried Ox Alpha for free on OpenRouter now knows which lab built it and can download the weights. Z.ai says GLM-5.3-Flash beats GLM-5.2 across benchmarks at one-tenth the price and gets close to Claude Opus 4.8 on coding and agent tasks, so this video lands while people are still deciding whether to switch.
Who is it for?
developers picking a coding model
Try it
https://huggingface.co/zai-org/GLM-5.3-Flash