Lilian Weng Leaves Thinking Machines Over Health Concerns, Returns to OpenAI to Lead Research Team

Jul 30, 2026
TechCrunch
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Summary

Lilian Weng departs Thinking Machines due to health concerns and returns to OpenAI, where she will lead a top-level research team focused on accelerating internal research, including recursive self-improvement.

Key Points

  • Lilian Weng steps down as co-founder of Thinking Machines, citing health concerns and unsustainable stress levels from startup life.
  • OpenAI confirms Weng is rejoining the company, where she will lead a top-level team focused on accelerating internal research, including work on recursive self-improvement.
  • Thinking Machines co-founder Mira Murati publicly supports Weng's decision to prioritize her health, though it remains unclear whether Murati knew Weng would return to OpenAI.

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