Andreessen Horowitz leads $2B seed round for Mira Murati's Thinking Machines Lab at $10B valuation
Jun 20, 2025
Key Points
- Mira Murati raises $2B in seed funding for Thinking Machines Lab at a $10B valuation, one of the largest seed rounds in Silicon Valley history.
- Andreessen Horowitz leads the round with participation from Conviction, betting heavily on Murati's ability to build an independent AI company after departing OpenAI in September 2024.
- The valuation reflects investor confidence in frontier AI talent and Murati's track record, though the company's technical approach and commercial focus remain undisclosed.
Summary
Mira Murati's Thinking Machines Lab raised $2B in a seed round led by Andreessen Horowitz with participation from Conviction, valuing the company at $10B. The six-month-old stealth startup's funding ranks among the largest seed investments in Silicon Valley history.
Murati, former chief technology officer at OpenAI, founded Thinking Machines after departing OpenAI in September 2024. The $10B valuation at seed stage reflects investor confidence in her track record and the competitive intensity around frontier AI talent. Andreessen Horowitz's lead position signals conviction in both the founder and the company's direction, though Murati has not publicly disclosed the company's stated mission, technical approach, or commercial focus.