Lillian Weng leaves Thinking Machines over health issues...joins OpenAI to work on "recursive self-improvement"

Lillian Weng, cofounder of Thinking Machines Lab, has rejoined OpenAI after leaving TML for health reasons.

She will lead research on recursive self-improvement, where next-generation AI designs and trains later models to improve performance.

The move highlights OpenAI’s push to develop AGI-relevant capabilities and strengthen its competitive edge.

TML has also seen a series of cofounder departures, raising questions about its team stability.