Bret Taylor's AI startup Sierra has secured $950 million from investors including Tiger Global and GV, valuing the company at over $15 billion. The influx of cash will be used to strengthen its position as the global standard for AI-powered customer experiences.

The company claims to have more than 40% of the Fortune 50 on board, with agents handling billions of interactions ranging from mortgage refinancing to insurance claim processing. Sierra’s rapid growth in annual recurring revenue has been impressive, reaching $150 million within months.

This funding round reflects both the urgency of enterprises to adopt AI and the associated costs. Taylor suggests that while agentic AI promises lower costs and higher returns, the initial investment can be substantial. Uber’s CTO Praveen Neppalli Naga shared that his company had to “blew through” their AI budget soon after adopting these tools.

Sierra is expanding its platform beyond customer-facing agents with Ghostwriter, a tool designed to build other agents using natural language descriptions. This innovation could significantly streamline development processes for businesses. The broader vision is one where employees never have to navigate complex systems at all, as proposed by Taylor in hisHumanX conference talk.