I can't find the announcement anymore, but you can see it under benefits here https://support.google.com/googleone/answer/14534406?hl=en
The initial separate subscriptions were confusing at best. Current situation is pretty much same as Anthropic/OpenAI - straightforward
Edit: changed ~1 month ago (https://old.reddit.com/r/Bard/comments/1npiv2o/google_ai_pro...)