xAI

xAI is Musk's AI company, founded in March 2023 with a stated mission "to understand the true nature of the universe" — a deliberately broad goal that puts it at the frontier of AI research rather than boxing it into one narrow product category.

See the xAI & X timeline: every Grok release, Colossus, and the deals that tied it all together →

Grok

xAI's main product is Grok, an AI assistant with a real difference from most competitors: direct, near-live access to what's happening on X. Where a lot of AI models work off a fixed training cutoff, Grok can pull in current events as they happen, which changes what it's actually useful for day to day.

Now part of SpaceX

Before any of the corporate moves below, Musk personally bought Twitter for $44 billion in October 2022 and rebranded it to X in July 2023.

The corporate structure here moved fast after that. In March 2025, xAI acquired X in an all-stock deal valuing it at $33 billion — folding the social platform and the AI company under one roof. Then in February 2026, SpaceX acquired xAI outright, making the combined entity one of the most valuable private companies in the world. In July 2026 xAI was renamed SpaceXAI, with a new logo and the @SpaceXAI handle on X. Grok kept its name. So today: SpaceX owns SpaceXAI (the former xAI), SpaceXAI owns X, and Grok sits at the center of both. Since SpaceX went public in June 2026, all of it is part of one listed company.

It's a real, literal example of the pattern across all of these companies — see How It All Connects — pulling separate pieces under one structure instead of running them as unrelated side projects.

Grok in orbit

That merger isn't just corporate structure — it's also the reason xAI's compute needs are now SpaceX's problem to solve, literally in space. See What's Next for Starmind, the planned AI satellite megaconstellation that would run Grok-style inference directly in orbit.