The Brain Drain: Why Musk’s SpaceXAI is Losing Its Lead

Elon Musk’s big bet on artificial intelligence is hitting a major rough patch. Since merging xAI with SpaceX in February 2026, the newly named SpaceXAI has lost over 50 top researchers and engineers. This talent exodus includes high-level leaders from the coding, world models, and Grok voice teams. For a company trying to beat giants like Google and OpenAI, losing this many experts in just a few months is a serious blow.

The departures follow a massive shift in how Musk runs his AI business. After the all-stock merger, Musk officially rebranded the group to SpaceXAI and brought in new leadership from the rocket side of the house. He even discussed buying the coding startup Cursor and signed a deal to let Anthropic use his massive “Colossus” supercomputer. These moves have left many wondering if Musk is still committed to building his own top-tier models or if he is pivotting to become a hardware supplier for others.

A Gutted Foundation

The most worrying part of this drain is the state of the pre-training team. This group is responsible for building the foundation that Grok and other models stand on. After team lead Juntang Zhuang left, the group reportedly shrank to just a handful of people. Without a strong pre-training team, it is almost impossible to keep up with the fast pace of modern AI development.

The trouble did not stop there. All 11 of the original xAI co-founders have now left the company. When an entire founding team disappears within three years, it usually points to deep cultural problems. Former employees say the “extreme work” culture Musk is known for finally became too much. Some reported being forced into meetings seven days a week at the Palo Alto office and facing impossible deadlines that led to cutting corners on the tech.

Rivals are Reaping the Rewards

While SpaceXAI shrinks, its competitors are growing. Meta has been the biggest winner, hiring at least 11 former SpaceXAI researchers since February. Thinking Machine Labs, a new startup launched by former OpenAI CTO Mira Murati, has also picked up at least seven key staffers. Even Anthropic, which is currently renting Musk’s servers, has hired away former co-founders like Ross Nordeen.

It is not all bad news for the people who stayed, though. SpaceX is currently preparing for a massive initial public offering (IPO) later in 2026. The company regularly offers “tenders” that allow employees to sell their private shares for cash. For some, the promise of a big payday is enough to keep them at their desks despite the long hours.

Musk’s goal has always been to build a “maximum truth-seeking AI,” but he cannot do that alone. He needs the best minds in the world to stay in the building. As his top talent flees to rivals, the future of Grok and SpaceXAI looks more uncertain than ever. Musk might have the fastest computers on Earth, but a supercomputer is just a very expensive space heater if you do not have the people to run it.