The Xbox Game Pass Ultimate Subscription includes Xbox Live Gold which gives you 2-4 free games monthly and exclusive discounts on other games. Plus, you get access to over 100 high-quality games to play anytime.
Note that the purchase of Xbox Game Pass Ultimate automatically upgrades your Xbox Live Gold and Xbox Game Pass memberships. Cancel your Ultimate membership at any time, and you will continue to have access to your Ultimate benefits until your prepaid time ends at which point you will not be charged again. The upgrade of any prepaid time cannot be reverted back to Xbox Live Gold or Xbox Game Pass.