AI startup Sierra raises $950M at $15.8B valuation to lead customer service AI market.

Sierra, an AI startup co-founded by OpenAI chair Bret Taylor, secured $950 million in a Series E funding round led by Tiger and Google's GV, pushing its valuation to $15.8 billion. The company specializes in AI customer service agents and has rapidly grown to over $150 million in annual recurring revenue in just eight quarters, serving major enterprises including Prudential and Blue Cross Blue Shield. This funding will help Sierra maintain its lead in the competitive AI customer service space as it continues to expand. CEO Bret Taylor anticipates a market correction in the next two years but plans to keep Sierra private for now, with an IPO in the future.