Bret Taylor

Sierra AI builds conversational AI agents designed to serve as the primary customer experience layer for consumer brands, replacing traditional chatbots and interactive voice response systems with autonomous agents capable of handling complex, multi-turn interactions. Co-founded in 2023 by Bret Taylor, former co-CEO of Salesforce and chairman of the board at OpenAI, alongside Clay Bavor, a former Google executive who led AR/VR initiatives, the company brings unusual executive credibility to the enterprise AI agent space. The company has raised approximately $635 million in total funding, achieving a $10 billion valuation at its Series C round. Investors include Sequoia Capital, Benchmark, and Greenoaks Capital. Sierra's agents integrate directly into existing enterprise tech stacks, handling tasks from order management and subscription changes to returns processing and account troubleshooting — all without requiring human escalation for the majority of interactions. Clients reportedly include WeightWatchers, Sonos, and other major consumer brands. Sierra AI operates in a rapidly consolidating AI customer service market, competing against Intercom's Fin, Ada, and legacy players like Zendesk and Salesforce Service Cloud. The company's advantage stems from its founding team's deep enterprise relationships and product instincts refined across decades at Google and Salesforce. With customer service representing an estimated $350 billion annual spend globally, Sierra's bet is that AI agents will absorb a significant share of that budget within five years, fundamentally restructuring how brands interact with their customers at scale.