OpenAI Cut Off One of Its Biggest Customers, on Purpose

Keypoints:

• • OpenAI is ending model access for Cursor, the AI coding tool, by November 12
  • The move follows Cursor's $60 billion acquisition by Elon Musk's SpaceX, completed August 14
  • OpenAI cited a "change of control" clause and past contract issues at Musk's other companies
  • Cursor CEO Michael Truell says OpenAI models power about 5% of Cursor's user traffic
  • Claude, Gemini, and Grok remain fully available inside Cursor

Cursor is a popular AI coding tool. OpenAI's models used to power part of it but not anymore. OpenAI announced it's pulling access entirely, with a proposed shutoff date of November 12.

The trigger was clear. SpaceX bought Cursor's parent company, Anysphere, in a $60 billion all-stock deal that closed August 14. OpenAI leaned on a "change of control" clause buried in its contract. The company pointed specifically to past disputes with Musk's other businesses, including a claim that X violated a prior agreement after Musk bought Twitter. Even OpenAI's next model, Astra, won't reach Cursor under the new terms.

This isn't only a contract dispute either. It's the newest flashpoint in a long-running feud between Sam Altman and Elon Musk. Musk co-founded OpenAI, left its board back in 2018, then sued the company over its shift to a for-profit structure. He didn't hold back this time. He wrote on X that he "couldn't care less."

Cursor's own CEO, Michael Truell, tried to shrink the story down. He noted OpenAI models only power about 5% of Cursor's traffic anyway. The rest already runs on Claude, Gemini, and Grok, all of which stay fully accessible. Anthropic moved fast too, pledging more compute for Claude inside Cursor the same day the news broke.