By its launch in February 2025, Thinking Machines Lab was reported to have hired about 30 researchers and engineers from competitors including
OpenAI,
Meta AI, and
Mistral AI. Its founding team members include Barret Zoph, former OpenAI VP of Research (Post-Training), Lilian Weng, former OpenAI VP, and OpenAI cofounder
John Schulman, who joined after a brief stint at the lab's competitor
Anthropic. In January 2026, it was reported that Barret Zoph and Luke Metz, departed the startup to return to OpenAI. Other former OpenAI employees who have been hired include Jonathan Lachman and Andrew Tulloch (although Tulloch departed after getting recruited for
Meta Superintelligence Labs). Thinking Machines Lab's advisers include Bob McGrew, previously OpenAI's chief research officer, and
Alec Radford, who was a lead researcher for OpenAI. On October 1, 2025, it announced Tinker, an
API for
fine-tuning language models. Users would submit jobs through the API for fine-tuning one of the various open-weight models supported. The Lab would run the jobs on its internal clusters and training infrastructure. == Business structure ==