It looks like theyre using the vercel ai sdk, which really isnt the vercel platform, doesnt have anything to do with any of the rest of vercel. Its actually quite nice and full featured.

It’s not. It’s on top of AI SDK, which is a popular open source library maintained by Vercel.

So the vercel ai js-sdk is not tied to the vercel platform and is “just” a js library which points to various llms? Is there any promise/plan/etc to keep it that way?

(I work at Vercel) Yes, it will continue to be an MIT-licensed open-source library to simplify building AI apps.