Explaining why you’re quitting a job can be tricky, especially if your plans change soon afterward.

Lilian Weng announced on Monday that she was leaving the AI startup she cofounded, Thinking Machines Lab, citing stress-related illness. “I don’t feel I’m able to continue at the pace a startup requires,” she wrote on X. “The amount of consistent stress and workload have pushed me beyond what my health can sustain physically.”

Two days later, OpenAI confirmed that Weng was rejoining the ChatGPT maker to lead a team focused on accelerating internal research. She had previously worked at the company from 2018 until late 2024.

It’s unclear when or…

Read the full article at BUSINESSINSIDER.COM