Toby Pohlen, co-founder of Elon Musk's artificial intelligence company xAI, has announced his resignation, becoming the seventh founding member to leave the company since its inception in 2023. Pohlen shared the news on social media, humorously noting his intention to catch up on sleep after leaving the team known for its intense work hours. Pohlen's departure marks the fourth resignation of an xAI co-founder in the past three months, following exits by notable figures such as former Google scientist Tony Wu, University of Toronto professor Jimmy Ba, and Groq founding member Greg Yang. The wave of resignations highlights significant turnover within the company's leadership team.