<ul><li>Sierra, the AI startup co-founded by OpenAI chairman Bret Taylor, has raised $175 million in a funding round.</li><li>The funding round values the startup at $4.5 billion.</li><li>Sierra specializes in AI-powered customer service chatbots for brands like WeightWatchers and Sirius XM.</li><li>Sierra's technology is claimed to be less prone to hallucinations and allows customization of AI's personality according to corporate brand.</li></ul>

Bret Taylor’s customer service AI startup just raised $175M

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