Bring Your Own Key (BYOK) is a deployment mode where a SaaS vendor's AI features use the customer's API key rather than the vendor's. The customer gains full control over routing (which provider), retention (data lifecycle), and billing (direct relationship with the model provider).
For AI document workflows, BYOK is commonly available for Anthropic Claude, OpenAI GPT, and Azure OpenAI. Customers who already have an enterprise contract with one of these providers can plug it in and benefit from existing data-handling commitments, EU-only routing, and per-prompt budgeting.