As OpenAI's CTO, Mira Murati oversaw the teams behind ChatGPT, DALL·E and GPT-4. She left in September 2024 and in July 2025 launched Thinking Machines Lab with a ~$2B seed round at a ~$12B valuation led by Andreessen Horowitz, with Nvidia, Accel and Cisco — one of the largest seed rounds in history, raised with no product and no revenue. Its first release, Tinker, is an API for fine-tuning open models. The clearest sign of how much a founding team is now worth on its own.

Why it's indexed

~$2B seed at ~$12B — among the largest seed rounds ever.
Founded by OpenAI's former CTO with a team of top researchers.
First product, Tinker, lets builders fine-tune open-weight models.

Coverage

Founder short: Mira Murati & Thinking MachinesFounder short

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