Even on ChatGPT Plus, it is using an old model text-davinci-002 as it says in the URL. The answers don't match what they should be for GPT-4 either.

False advertising. They got my money already unfortunately as I was hoping to Try it, as it says with this link next to today's date.

I don't get it, there are multiple people in this thread saying they are running experiments with it?

Is it random assignment?

I personally have access.

I assume they're rolling it out slowly. The demand would likely overwhelm their systems if they enabled it for everyone at once. No one would be able to do anything meaningful.

As a ChatGPT+ subscriber, I am taken to the old version of the model and do not have an option to select ChatGPT-4.