Sierra to Raise $350 Million in New Funding Round

September 03, 2025
Sierra, co-founded by OpenAI Chairman Bret Taylor, is set to raise $350 million, valuing the company at $10 billion.

Sierra, a company specializing in AI agents for enterprise customer service, is nearing the completion of a $350 million funding round. This new investment will value the company at $10 billion. The funding is expected to be led by Greenoaks Capital.

Sierra's platform, Agent OS, is designed to build, deploy, and manage AI agents that provide customer service solutions. The company is on track to surpass $100 million in annual recurring revenue (ARR), highlighting its growing influence in the AI sector.

The company was co-founded by Bret Taylor, who also serves as the chairman of OpenAI, and Clay Bavor, a former Google executive. Sierra's technology allows enterprises to customize AI agents to align with brand guidelines and offer consistent support across multiple channels.

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