Clemens Winter announced on X on 21 May 2026 that he had left OpenAI earlier that week.
In his farewell message, he reflected on his growth and relationships at the company. He said his main regret was not spending more time on governance and alignment, and expressed concern about the concentration of power as more work becomes automated.
The date recorded here is the announcement date. The post did not name a next employer or give an exact last working day.