Details about AI pricing

Hi, I just discovered the new AI features, and mainly text-to-speech with the new AI voices that are just mind ear blowing !

What is unclear to me is the exact price of such features : I did see that Articulate AI is 300$ more per user per year, but I can't find wether that includes a given number of tokens/credits per month, each AI use spending some, like I see in other products (VTS Editor for example).

Can someone enlighten me please ?

TIA