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Sierra, Co-Founded by Bret Taylor, Raises $350M at $10B Valuation

September 5, 2025

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Sierra, Co-Founded by Bret Taylor, Raises $350M at $10B Valuation

Sierra, an AI agent startup co-founded by Bret Taylor and Clay Bavor, has raised $350 million in funding, reaching a $10 billion valuation led by Greenoaks Capital. The company has quickly gained hundreds of enterprise clients, including SoFi and Brex, and has raised a total of $635 million since...

OpenAI Chair Bret Taylor: We're in an AI Bubble (And That's Okay)

The current AI investment surge resembles a classic tech bubble, similar to the dot-com era, with inevitable financial losses expected. Despite the hype and speculation, the underlying potential of AI is considered real and transformative, much like the internet revolution. The key challenge is n...

Can OpenAI Be Trusted? The Push for AI Accountability

OpenAI's corporate structure and mission commitment are under scrutiny, raising questions about AI governance, profit motives, and ethical responsibility. The organization, originally a nonprofit, is moving away from this model for funding and a public offering, despite criticism from advocacy gr...