It's available to Pro users, but not through Antigravity.
I see it is now. I tried all the services 3 hours ago and the only interface to acknowledge its existence at the time was the API interface which told me to upgrade to Ultra.
alt Hacker News
I see it is now. I tried all the services 3 hours ago and the only interface to acknowledge its existence at the time was the API interface which told me to upgrade to Ultra.