Xbox Game Pass for PC is out in Beta;
Currently is $1 for the first month, then $4.95 per month there-after for a limited time (while it's still in Beta maybe?), then $10.95 per month.
Here's a list of games currently available with the PC subscription;
If you game on Xbox too, the pricing for the Ultimate subscription is better value in my opinion. $15.95 per month gives you Xbox Game Pass for both Console and PC, and also Xbox Live subscription.