Weng Returns to OpenAI After Week-Long TML Exit

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- Lilian Weng announced earlier this week she was leaving Thinking Machines Lab — the AI startup she co-founded — citing workload-related health concerns, according to The Information.
- Thinking Machines Lab was co-founded alongside a former OpenAI Chief Technology Officer (name truncated in source), and Weng is now heading back to OpenAI.
Why it matters: Thinking Machines Lab loses a co-founder within days of her departure announcement, while OpenAI regains a researcher — a rapid reversal that puts the newer startup a founding member short even as Weng returns to a familiar employer.



