Thinking Machines Lab
Thinking Machines Lab is a Frontier Foundation Labs company founded in 2025 and based in San Francisco, United States. It has raised $2B in total funding, most recently a Seed in 2025 at a $12B valuation.
Thinking Machines Lab is an AI research company founded in February 2025 by Mira Murati, the former chief technology officer of OpenAI. Its founding team drew heavily from OpenAI, including co-founder John Schulman, who serves as chief scientist. In October 2025 it launched Tinker, an API for fine-tuning open-weight language models. The company raised one of the largest seed rounds in Silicon Valley history.
Thinking Machines Lab closed a $2B seed round at a $12B valuation in July 2025 with no product yet shipped, one of the largest first rounds ever and a signal of how OpenAI alumni and frontier talent command record capital.
thinkingmachines.ai ↗·Frontier Foundation Labs·
United States·private 
