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Inbox Zero covers AI costs by default, but you can optionally use your own model-provider API key.
This setting is for the AI provider that powers Inbox Zero features. It is different from the developer API keys in the Developer settings section, which authenticate requests to the Inbox Zero API.

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Configure a Provider

  1. Open the account menu at the bottom of the sidebar and choose Settings.
  2. Expand the relevant email account.
  3. Find the AI Model section.
  4. Select a provider, enter the provider’s model identifier and API key, then click Save.
  5. Test the configuration on the Assistant or Chat page.
Leave the provider set to Default to use the AI service included with Inbox Zero.

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Providers in Settings

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Anthropic

Create a key in the Anthropic Console. Enter an Anthropic model identifier in the Model field.

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OpenAI

Create a key on the OpenAI API keys page.

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Azure OpenAI

Use an Azure OpenAI API key and enter the Azure deployment name in the Model field.

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Google

Create a Gemini API key in Google AI Studio and enter the corresponding model identifier.

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Groq

Create a key in the Groq Console and enter a model available to your Groq account.

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OpenRouter

Create a key in OpenRouter. Use OpenRouter’s provider-qualified model identifier, such as provider/model.

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Vercel AI Gateway

Create an AI Gateway API key in Vercel and use the model identifier expected by Vercel AI Gateway. Provider-qualified identifiers are recommended.

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Usage and Billing

When you use your own provider key, the provider bills that account according to its pricing and limits. Click View usage in the AI Model section to review the usage recorded by Inbox Zero. Provider-side billing remains the source of truth for charges.