1# Subscription
 2
 3Zed's hosted models are offered via subscription to Zed Pro or Zed Business.
 4
 5> Using your own API keys is _free_—you do not need to subscribe to a Zed plan to use our AI features with your own keys.
 6
 7See the following pages for specific aspects of our subscription offering:
 8
 9- [Plans and Usage](./plans-and-usage.md): Outlines Zed's plans, how usage is measured, and usage-based pricing for overages.
10
11- [Billing](./billing.md): Billing policies and procedures, and how to update or view various billing settings.
12
13- [Models](./models.md): Overview of the models offered by Zed's subscriptions.