Ask HN: How fast could Google/Baidu create and deploy their ChatGPT equivalent?

I’ve been invited to invest in OpenAI. The valuations are pretty high. And while it may be worth it, I have to wonder how difficult it will be for others (Google, Baidu, AWS, etc.) to create and deploy similar tech if they see ChatGPT gets enough traction and it makes business sense for them to do it.