Sierra, a software startup cofounded by former Salesforce co-CEO Bret Taylor, has raised $175 million in a new funding round led by Greenoaks Capital that gave it a $4.5 billion valuation ...

a major backer of ChatGPT creator OpenAI, as Big Tech companies race to infuse AI into their applications. Amazon.com also said last month it would invest up to $4 billion in Anthropic to compete ...