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AI Star Wang Li Steps Back: Health First, Startup Life Too Intense

AI Star Wang Li Steps Back: Health First, Startup Life Too Intense

Lilian Weng, a name synonymous with AI safety and a trailblazer from Peking University, has hit the pause button. The former Vice President of Research and Safety at OpenAI and co-founder of Thinking Machines Lab announced her resignation on X, citing a stark reason: her body couldn't take it anymore.

A Farewell Letter That Hits Home

In her post, Weng didn't mince words. She revealed that over the past seven months, she had been unwell more often than any other period in her life. The relentless pressure and workload had simply exceeded what her body could handle. It's a raw, human moment from someone who has been at the forefront of AI development.

She considered switching to a less demanding role, but ultimately decided against it. Her reasoning? "If I cannot fully commit to the work I should be responsible for, it means I have not done this job properly." That's a level of integrity that's both admirable and, frankly, a little heartbreaking. She added a thought that resonates deeply: "A future worth building is one that puts people first." And for herself, she hopes to join an organization with a stable rhythm and clear responsibilities—no more co-founder-level startup chaos.

From Peking to Silicon Valley: A Stellar Run

Weng's journey is the stuff of legend. After joining OpenAI in 2018, she started on the robotics team and eventually built and led a safety systems team of over 80 people. She was instrumental in the safety development of core models like GPT-4, GPT-4o, and o1. In August 2024, she was promoted to VP of Research and Safety, only to leave in November. Then, in February 2025, she co-founded Thinking Machines Lab with former OpenAI CTO Mira Murati and others.

The company just closed a $2 billion seed round in July 2026, with a post-money valuation of $12 billion. Yet, at this peak, Weng chose to step back. It's a twist that speaks volumes about the real cost of AI's gold rush.

The Human Cost of AI Hype

Mira Murati publicly supported Weng's decision, acknowledging her choice to prioritize health. But Weng's departure is more than a personal story—it's a mirror reflecting the industry's dark side. High valuations, insane pressure, and burnout are the norm, not the exception. Weng's exit is a reminder that even the brightest stars need to look after themselves.

Key Points

  • Lilian Weng resigns from Thinking Machines Lab due to severe health issues.
  • She emphasized a 'people-oriented' future and seeks a stable work environment.
  • Her career includes leading safety at OpenAI and co-founding a $12 billion startup.
  • The departure highlights the intense pressure of AI entrepreneurship.