Thinking Machines co-founder Lilian Weng left the company citing health reasons, then joined OpenAI

Lilian Weng, co-founder of Thinking Machines, announced this week that she would step down from her role, citing health issues.

“I don’t feel I’m able to continue at the pace a startup requires,” she wrote in an internal Slack message, which she also shared on X. “After thinking about it for several months, I ultimately have to admit that the amount of consistent stress and workload have pushed me beyond what my health can sustain physically.”