If it's not clear what's happened:

The launch was scheduled for 11am Pacific time.

The press embargo broke at 11am, and we saw a flurry of press articles by Axios, TechCrunch et al.

The model has appeared on the ChatGPT API.

But the official blog post is not out yet after nearly an hour.

Apparently the article was posted then quickly taken down, hence there are snippets of information coming out.