[AI Startup Sierra Founded by OpenAI Board Chair Completes $950 Million Financing, Valuation Reaches $15.8 Billion] According to CNBC, enterprise AI startup Sierra, co-founded by OpenAI Board Chair Bret Taylor and former Google executive Clay Bavor, has completed a $950 million Series E financing round, with a post-money valuation of $15.8 billion. This round was led by Tiger Global and Alphabet's venture capital arm GV, with participation from existing investors such as Benchmark, Sequoia, and Greenoaks. Sierra primarily provides AI customer service agent products, enabling enterprise clients to automate customer service and support scenarios. It is reported that Sierra's annual recurring revenue has surpassed $150 million within eight quarters.