OpenAI notified SpaceX that it intends to wind down the contract supplying OpenAI models to Cursor, with a proposed end date of November 12, per OpenAI. The trigger is a change-of-control provision activated when SpaceX closed its $60 billion acquisition of Anysphere, Cursor's parent, earlier this month. OpenAI said it cannot be confident SpaceX will use the technology within its terms, citing Twitter's breach of an OpenAI contract after Musk acquired it and Musk's sworn admission that xAI had violated OpenAI's terms of service. It is giving the maximum notice the contract allows.
Roughly 5% of Cursor's user traffic keeps this in proportion, per the reporting. Cursor's defaults have run on Anthropic models for years, so losing OpenAI removes an option and leaves the engine intact. This is loud strategically and small operationally, and any coverage suggesting Cursor has been crippled has the proportions wrong.
The mechanism is what makes this notable. Every model-supply agreement contains a change-of-control clause, and this is the first time one has been exercised at this profile. When we covered the Anysphere acquisition in June, the risk we flagged ran the other way: SpaceX would hold a quarter-by-quarter decision over whether Cursor kept buying Anthropic. The first move came from a supplier instead, deciding it did not want its models inside a competitor's product. Model access has become a lever suppliers can pull, and the trigger is who owns the customer.
OpenAI's stated grounds are specific and documented, well beyond general suspicion, which matters for how other labs read the precedent. For anyone building on third-party models, the practical lesson is that an acquisition can end model access on terms the acquired company does not control. Read the change-of-control language before the term sheet, because a product whose defaults depend on one supplier has a dependency that survives no change of ownership.
Bottom Line
Five percent of traffic makes this a signal for Cursor, well short of a crisis. The precedent is what carries: model supply is now a competitive weapon, and change-of-control clauses are live risk in any deal involving an AI-dependent product.