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