Bret Taylor’s AI Startup Sierra Valued at $10 Billion

Bret Taylor and Clay Bavor
Photographer: Michaela Vatcheva/Bloomberg

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By Emily Forgash

September 4, 2025 at 6:51 PM UTC

Updated on

September 4, 2025 at 7:45 PM UTC

Sierra Technologies Inc., the artificial intelligence startup founded by OpenAI Chairman Bret Taylor and former Alphabet Inc. executive Clay Bavor, has raised $350 million in a financing round that values the company at $10 billion.

The financing is being led by Greenoaks Capital Partners, Sierra said in a blog post Thursday.