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

By Modelverse Editorial·July 29, 2026·2 min read
Thinking Machines co-founder Lilian Weng left the company citing health reasons, then joined OpenAI

Lilian Weng, a co-founder of Thinking Machines, recently announced her departure from the startup, citing health concerns stemming from the intense stress and workload inherent in a fast-paced startup environment. This decision, shared publicly, highlighted the personal toll that demanding roles in the tech industry can take. Shortly after this announcement, it was revealed that Weng would be rejoining OpenAI, where she previously held the position of VP of AI Safety Research.

At OpenAI, Weng is set to lead a crucial top-level team dedicated to accelerating the company's internal research initiatives. A key focus for her team will be to support cross-research efforts in recursive self-improvement. This advanced concept involves developing AI systems capable of iteratively enhancing their own capabilities, essentially learning to make themselves more powerful over time. Her role will be pivotal in pushing the boundaries of OpenAI's foundational AI development.

This high-profile talent acquisition is significant for both developers and researchers in the AI community. Weng's move underscores the fierce competition for top-tier expertise among leading AI labs. Her leadership in accelerating research, particularly in recursive self-improvement, signals OpenAI's commitment to exploring cutting-edge methods for AI advancement. For the broader AI landscape, this shift could influence the pace and direction of future AI capabilities, making her contribution to OpenAI's core research trajectory a critical development to watch.

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