Comment by numpad0

Or just written by a Chinese speaker. The text do sound human, no?

China/Japan/Korea do everything from pencils to rockets in local languages. You can buy a quantum physics textbook in Chinese on Amazon, if you want. English is truly just a tool in Far East region, and so individual proficiency of a Far Eastern person and their English speaking skills do not correlate well if not negatively correlating.

e: asked Hunyuan-T1 itself[0] on the demo page[1], for fun. Its conclusion was "最可能的情形是：具备一定技术背景的中文母语者，在有限时间内完成的初稿(GT: "The most likely scenario is that a native Chinese speaker with a certain technical background completes the first draft within a limited time")".

0: https://gist.github.com/numpad0/7699db43ae23f054dc2db5673011...

1: https://llm.hunyuan.tencent.com/#/chat/hy-t1