# Models and keys

> Which model an Agent host agent uses: your own key on every plan, and model tiers haiku, sonnet and opus.

Source: https://agentaloo.tech/docs/models-and-keys/

**Every plan.** Bring your own AI: add your own model key. It is sealed and never shown again. Only your provider's model is called with it, and the deployment's keys are never used for your workspace. Your provider bills the model.

You choose the tier in the agent's setup: haiku, sonnet or opus.