xAI, Elon Musk's artificial intelligence venture, is grappling with a significant wave of departures, including two co-founders who recently announced their exit, bringing the total to six out of the original 12 founding members. Yuhuai (Tony) Wu, a co-founder and reasoning lead, declared his departure on Monday night, stating, “It’s time for my next chapter. It is an era with full possibilities: a small team armed with AIs can move mountains and redefine what’s possible.” Less than 24 hours later, Jimmy Ba, another xAI co-founder who reported directly to Musk, also announced his exit, expressing gratitude to Musk for the journey and pride in the xAI team's accomplishments.

These recent exits are part of a troubling pattern for the lab, with five of the six co-founder departures occurring within the last year. Previous high-profile departures include infrastructure lead Kyle Kosic, who left for OpenAI in mid-2024, Google veteran Christian Szegedy in February 2025, Igor Babuschkin who departed in August to found a venture firm, and Microsoft alum Greg Yang who left just last month citing health issues.

Elon Musk addressed the departures at an all-hands meeting, suggesting the exits were about 'fit' rather than performance. He elaborated, “Because we’ve reached a certain scale, we’re organizing the company to be more effective at this scale. And actually, when this happens, there’s some people who are better suited for the early stages of a company and less suited for the later stages.” He later clarified on X that these departures were not voluntary, stating, “xAI was reorganized a few days ago to improve speed of execution. As a company grows, especially as quickly as xAI, the structure must evolve just like any living organism. This unfortunately required parting ways with some people.” Musk also added that the company is “hiring aggressively” with a characteristic pitch: “Join xAI if the idea of mass drivers on the Moon appeals to you.”

Beyond the co-founders, at least nine engineers publicly announced their departure from xAI in the past week, although some of these exits occurred a few weeks prior. Notable among them are Shayan Salehian, who worked on product infrastructure and model behavior and left to “start something new,” and Vahid Kazemi, an ML PhD, who left believing “all AI labs are building the exact same thing, and it’s boring… So, I’m starting something new.” Roland Gavrilescu, a former xAI engineer who had previously left in November to start Nuraline, posted that he left that firm to build “something new with others that left xAI.” Other departing staff include Ayush Jaiswal, Simon Zhai, Hang Gao, and Chace Lee, with several hinting at a desire for greater autonomy and the opportunity to build frontier tech more rapidly in smaller teams.

While Musk frames the reorganization as a calculated move for efficiency, and some departures appear amicable—with founders moving on to capitalize on the booming AI startup market or after potential windfalls from SpaceX’s acquisition of xAI and a pending IPO—there are also less amicable factors at play. The company’s flagship product, the Grok chatbot, has reportedly struggled with bizarre behavior and apparent internal tampering. Furthermore, xAI faced significant controversy after changes to its image-generation tools led to the dissemination of nonconsensual explicit deepfakes, sparking regulatory scrutiny, including a raid on X offices by French authorities as part of an investigation.

The company is also navigating intense pressure as it moves towards a planned IPO later this year. The cumulative impact of losing top talent, especially co-founders, is alarming. With Musk pursuing ambitious plans like orbital data centers, the demand for Grok to keep pace with leading models from OpenAI and Anthropic is immense. In the highly competitive frontier AI landscape, xAI’s ability to attract and retain top researchers will be severely tested. Despite xAI maintaining a headcount of over 1,000 employees, the rapid pace of recent departures and the trend of ex-xAI engineers forming new ventures together suggest deeper tensions and challenges in scaling successfully. Musk also faces personal scrutiny, with recently published Justice Department files showing extended conversations with convicted sex trafficker Jeffrey Epstein.