Sierra

Sierra is an enterprise conversational AI platform — branded as an Agent Operating System (Agent OS) — that enables businesses to build, deploy, and optimize AI agents for customer experience across chat, voice, email, SMS, and WhatsApp in 59+ languages. Founded in 2023 by Bret Taylor (former Salesforce co-CEO, OpenAI board chair) and Clay Bavor (former Google Labs head), it lets CX and engineering teams create autonomous agents that take real actions such as processing returns, updating CRM records, and managing subscriptions. The platform includes Agent Studio (no-code builder), Agent SDK (developer tools), Ghostwriter (AI-powered agent builder), and the Agent Data Platform for persistent cross-session memory, with built-in guardrails, safety controls, and outcome-based pricing.