OpenAI Cuts Off Cursor After SpaceX Buys the Coding Tool
3 min readOpenAI is cutting off one of the best known AI coding tools from its models. On August 28 the company notified SpaceX that it intends to wind down the contract supplying OpenAI models to Cursor, with a proposed shutoff date of November 12, 2026.
How Cursor Ended Up Inside SpaceX
Cursor is the AI code editor built by Anysphere, and it has run on OpenAI models for close to four years. While the two companies were simply supplier and customer, that arrangement was unremarkable. Cursor became one of the fastest growing developer tools of the past two years largely by making frontier models feel native inside an editor.
The picture changed on August 14, when SpaceX closed its roughly $60 billion acquisition of Cursor. The editor now sits inside an AI portfolio organized around xAI and its Grok models. That puts one of OpenAI closest rivals in control of a product OpenAI was helping to power.
What OpenAI Said
In a post explaining the decision, OpenAI said it cannot be confident that SpaceX will use its technology within the terms of service, citing its experience with Elon Musk companies and contract disputes. It also pointed to Musk admission under cross-examination in the long running litigation between the two sides that xAI had trained on OpenAI outputs, a practice known as distillation.
Cursor chief executive Michael Truell moved quickly to limit the fallout, saying OpenAI models account for roughly 5 percent of Cursor traffic. The large majority of Cursor users already work through Anthropic Claude models or Google models, and both remain fully available inside the product. Developers who rely on GPT models specifically have until November 12 to move.
Why the OpenAI and Cursor Split Matters
This is the clearest sign yet that model access is becoming a competitive lever rather than a neutral utility. For most of the current cycle, application companies could assume they would be able to buy from every frontier lab at once and let users pick. Ownership now changes that calculation: buy an app company and you may inherit a supplier who wants out.
Watch for two things next. The first is whether Anthropic and Google make any similar move, which would leave Cursor functionally dependent on Grok. The second is whether other labs start writing change of control terms into their API agreements, which would make future acquisitions of AI application companies considerably more complicated to price.
For developers, the practical advice is simple: check which model your Cursor workflow actually calls, and switch before the November deadline if it is a GPT one.