# Thinking Machines Co-founder Lilian Weng Left the Company Citing Health Reasons, Then Joined OpenAI

> **Platform:** [SPIDITS AI](https://spidits.com/) — Real-Time AI News & Market Intelligence  
> **Published:** 2026-07-29T21:07:48.000Z  
> **Category:** RESEARCH  
> **Impact Score:** 170/100  
> **Primary Source:** [TechCrunch AI](https://techcrunch.com/2026/07/29/thinking-machines-co-founder-lilian-weng-left-the-company-citing-health-reasons-then-joined-openai)  
> **Canonical Citation:** [https://spidits.com/timeline/thinking-machines-co-founder-lilian-weng-left-the-company-citing-health](https://spidits.com/timeline/thinking-machines-co-founder-lilian-weng-left-the-company-citing-health)

## Executive Summary
Weng previously served as the VP of AI Safety Research at OpenAI.

## Why It Matters (Strategic Analysis)
Lilian Weng, co-founder of Thinking Machines , announced this week that she would step down from her role, citing health issues.

## Key Entities & Companies
- **OpenAI**

## Referenced Coverage & Sources
- **[TechCrunch AI](https://techcrunch.com/2026/07/29/thinking-machines-co-founder-lilian-weng-left-the-company-citing-health-reasons-then-joined-openai)**: Thinking Machines co-founder Lilian Weng left the company citing health reasons, then joined OpenAI — _Weng previously served as the VP of AI Safety Research at OpenAI._

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*Synthesized by SPIDITS AI Market Intelligence Desk. Track live AI news, model releases, and funding: [https://spidits.com](https://spidits.com)*