<ul><li>Sierra, an AI startup cofounded by Bret Taylor, has raised $175 million in a funding round led by Greenoaks Capital, valuing the company at $4.5 billion.</li><li>Sierra's funding round comes less than a year after its launch and has established it as one of the most highly valued AI startups.</li><li>Sierra focuses on selling AI-powered customer service chatbots to enterprises and has crossed $20 million in annualized revenue.</li><li>Sierra differentiates itself by reducing 'hallucinations' in language models and counts clients like WeightWatchers and Sirius XM.</li></ul>

OpenAI chair's AI startup Sierra gets $4.5 billion valuation in latest funding round

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