OpenAI will stop supplying models to Cursor on November 12

OpenAI told SpaceX on August 28 that it is winding down the contract providing OpenAI models to Cursor, with a proposed shutoff date of November 12, 2026, the maximum notice its agreement allows. The company says it cannot be confident SpaceX will keep the technology within OpenAI's terms of service, citing X's prior breach of its OpenAI contract after Musk acquired the platform and Musk's own admission, under oath earlier this year, that xAI had violated OpenAI's terms of service. OpenAI also points to new accountability requirements around its upcoming model, Astra, as a reason it will not extend future models to Cursor under the existing arrangement, even while holding the cancellation to the latest date the contract allows. The Hacker News thread on the announcement had reached 199 points and 77 comments about two hours after posting.

Why it matters: Anyone whose harness or product depends on OpenAI models running inside Cursor now has a hard date to build around, whether that means moving to Anthropic or Google models inside the editor or moving off Cursor entirely. The decision shows that an ownership change can alter a coding-agent vendor's model supply.