# Thinking Machines co-founder Lilian Weng resigns citing health, joins OpenAI

Lilian Weng, co-founder of AI startup Thinking Machines, left the company for health reasons and has now joined OpenAI. Her move highlights ongoing talent shifts in the AI industry.

**Importance:** 3/5

## Sources

### Technology
- [TechCrunch](https://techcrunch.com/2026/07/29/thinking-machines-co-founder-lilian-weng-left-the-company-citing-health-reasons-then-joined-openai/) — Wed, 29 Jul 2026 21:07:48 +0000