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Given the subdomain name, I presume it uses the Yi-34B model?

I have no idea, but yiyan is short for wenxinyiyan（文心一言), which roughly translates to character-heart-one-(speech/word). Maybe someone who is Chinese could translate it better. So I don't think the name has anything to do with the model.

I do wonder what their backend is. They have the same 3.5/4 version numbering scheme that ChatGPT uses, which could be just marketing (and probably is), but I wonder.

EDIT: fixed my translation

“A single word from the heart”

Their backend originates from Baidu ERNIE: http://research.baidu.com/Blog/index-view?id=160

AFAIK, model behind yiyan is Baidu's ERNIE. Yi-34B (and Yi model family) comes from another startup created by Kai-fu Lee earlier this year: 01.ai.

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