Decagon

Decagon builds AI agents that resolve customer support conversations across chat, email, SMS and voice. It is aimed at fast-growing and enterprise companies, and teams define agent behaviour with Agent Operating Procedures written in natural language.

Agent Operating Procedures read like internal playbooks but can call APIs, so the agent can check accounts, issue credits or update subscriptions. Decagon includes analytics that cluster conversations by topic, highlight where customers get stuck and suggest knowledge base fixes.

Decagon raised a Series D in January 2026 at a $4.5 billion valuation. It is sold through sales with custom contracts rather than self-serve plans, and deployments usually start with one channel before expanding.