Normally I stick to open-source stuff on here, and Cursor isn’t that — it’s a closed, VC-backed VS Code fork. But something happened this week that I think is actually the most useful case study I’ve come across for a theme I keep circling back to, so I’m making an exception.

Here’s what happened, as far as I can piece together from OpenAI’s own statement and the reporting around it: SpaceX acquired Cursor’s parent company, Anysphere, for a reported $60 billion. Within days, OpenAI announced it’s terminating Cursor’s direct access to its models, with a shutoff date of November 12, 2026. OpenAI’s stated reason is blunt — they don’t trust SpaceX to follow their terms of service, citing past conduct from other Musk-owned companies. There’s a contract clause apparently built for exactly this: a change-of-control provision that lets OpenAI walk away when ownership changes hands.

A few things worth knowing if the headline made this sound scarier than it is:

  • OpenAI models reportedly account for something like 5% of Cursor’s actual user traffic — most people are already on Claude or Gemini through it
  • Existing OpenAI models keep working in Cursor until the November cutoff; it’s future models (including whatever comes after, reportedly a model called Astra) that won’t be added going forward
  • Cursor’s CEO has said publicly they’re in talks with OpenAI about it

I don’t have a strong opinion on the Musk/Altman feud itself, and I don’t think that’s the interesting part anyway. What I keep thinking about is: this is a contract between two companies that both have every incentive to keep working together, and it still got severed over something neither Cursor’s engineering team nor its users had any control over. If you build your workflow entirely around one tool that depends entirely on one model provider, that dependency is a real risk sitting there whether or not anything ever goes wrong.

It’s also worth knowing that Anysphere wasn’t just sitting still before this acquisition — the same June that this SpaceX deal was announced, Cursor’s parent company had itself just acquired Continue Dev, Inc., the team behind Continue.dev, and shut its development down. So in the space of about a week, ownership went from an independent BYOK tool, to Cursor, to SpaceX. It’s the same underlying risk playing out twice in one chain, just at different scales.

Which is, incidentally, exactly the argument for the tools I usually write about here — OpenCode and Aider among them, things built from day one to not care which model is behind them. Nobody can pull a model out from under you if you were never locked to a single one in the first place.

Source: OpenAI’s own statement.