They announced it on twitter [1]:

> A new model is now available on http://chat.z.ai.

Looks like that's all they can handle atm:

> User traffic has increased tenfold in a very short time. We’re currently scaling to handle the load.

[1] https://x.com/Zai_org/status/2021564343029203032

The second sentence from a creative writing prompt:

Valerius stood four meters tall—roughly thirteen feet. He was not merely a Space Marine; he was a biological singularity.

I'm surprised they still have the emdash and "not x, but y" quirks

There was a one-line X post about something new being available at their chat endpoint, but that's about it at the time of this writing. Nothing at GitHub or HuggingFace, no tech report or anything.