Cursor is now part of SpaceX: the close that puts the editor on the Grok team

Today Cursor posted a short tweet: it’s now part of SpaceX. Not a rumor, not a leak. The official account saying the acquisition has closed and the team is joining SpaceXAI to work on Grok, Grok Build, Grok Bot, the API… and Cursor.

If this feels like déjà vu, that’s fair. The deal was announced on 16 June (stock, a reported valuation around $60 billion). What was missing was the stamp. They put it on today.

This is not the June story #

In the roundup I wrote of that Grok week I mentioned, in passing, that they had bought Cursor and that Grok 4.5 had been trained with them. I didn’t give it a post: it was scenery, not the headline.

Today it is, for a boring and important reason: until it closes, an acquisition is a slide deck. There can be a breakup, regulators, a walk-away. Today’s tweet shuts that door. Cursor is no longer an independent startup. It is a SpaceXAI team.

What they said — and what they didn’t #

The text is short and, for once, clear:

• The deal has closed.
• They are joining the SpaceXAI team.
• The pitch: make Grok “the world’s most useful AI”.
• The list of things they will work on includes Cursor. So they are not presenting it as a corpse to be absorbed and switched off.

What the tweet does not say: whether Cursor stays a paid product on its own, whether Grok Build and Cursor eventually merge, whether the editor’s default model becomes Grok, what happens to Composer. That, for now, is tea-leaf reading. I’d rather not invent it.

Why I care (and it’s not the valuation) #

A couple of weeks ago I started actually coding with Grok Build, after months on Claude. Dual-stack: Claude for what already has context (Moodle, this blog), Grok for new projects and so I’m not tied to one vendor.

Cursor the editor? I don’t use it. I stayed on the terminal agent. But the map has changed: the IDE that ate VS Code across half the industry and the CLI I am experimenting with now live in the same house. That isn’t a market headline. It’s a practical question: a year from now, is “the place you code with Grok” a TUI, a VS Code fork, or both with the same account?

If you use Cursor and don’t care about Grok, the close still hits you. The owner of the editor is no longer Anysphere. It’s the same group that owns X, the rockets, and the model competing with Claude. Product roadmaps, privacy, and “which model do we put in front of you” will be written by someone else.

What does not change this afternoon #

• Grok Build is still the CLI. Cursor is still the editor. There is no app merger today.
• Claude did not get worse because SpaceX signed a paper.
• Your subscription price is not rewritten by a tweet.

What does change is the board. SpaceXAI is no longer “the model + a CLI”. It’s model, CLI, API, bot… and the editor that has grown the most among programmers in two years. That is much harder to ignore than a snarky chatbot inside X.

What I’m taking away #

In June it was a huge announcement. Today it’s a fact. Cursor is no longer the startup eating GitHub Copilot’s lunch: it is another brick in the same Lego set as Grok.

I’ll keep both agents for a while. But from today, when I open Grok Build, I’m not using “Musk’s weird alternative”. I’m using a tool from a company that also owns the editor half the people I know program in.

No hype, no hit job: it closed. The rest — whether Cursor stays, merges, or Grok becomes the default — will show up in the product, not in the tweet.

Sources: Cursor on X, CNBC (June announcement).