OpenAI said it will end its contract with Cursor, a startup that was acquired by SpaceX.
The company pointed to past conduct by Twitter, another Elon Musk-owned company.
OpenAI said it would not provide Cursor access to future models, including Astra.
OpenAI said it’s ending its contract with Cursor, a coding startup recently acquired by SpaceX, because it doesn’t trust an Elon Musk-owned company to comply with its terms of service.
The company said in a statement published on Friday night that it plans to shut off Cursor’s access to OpenAI models on November 12.
“This decision was incredibly tough, as we care deeply about our models being broadly available for developers,” OpenAI said. “We are making this choice because we cannot be confident that SpaceX will use our technology within our terms of service, based on our experience with Elon Musk’s companies violating contracts.”
Spokespeople for SpaceX and OpenAI did not immediately return a request for comment.
OpenAI did not accuse Cursor of violating any terms. It instead pointed to past conduct by another Musk-owned company, Twitter, which Musk bought in 2022 and merged with SpaceX earlier in February.
OpenAI said in its blog post that Twitter had previously violated the terms of its contract, citing a New York Times story reporting that Musk cut off OpenAI’s access to Twitter’s data. OpenAI also wrote that the SpaceX CEO said under oath earlier this year that xAI had violated OpenAI’s terms by training Grok from OpenAI’s output.
Musk said at the time that it was “partly” true that xAI had distilled OpenAI’s models, The Verge reported in April.
OpenAI said that it uses “custom contracts” with large partners like SpaceX to ensure compliance. The partnership OpenAI had with Cursor provided a “limited time window” to cancel the agreement after the acquisition, the company said.
SpaceX officially acquired Cursor this month for $60 billion. The deal gives the coding startup access to SpaceX’s computing power.
Michael Truell, a cofounder and the former CEO of Cursor, responded to OpenAI’s decision on X on Friday night.
“We’re sorry to see that OpenAI put out a note saying they plan to block Cursor users from accessing OpenAI models in three months,” Truell wrote. “OpenAI models serve about 5% of Cursor user traffic, and we’re speaking with the OpenAI team to resolve this.”
Cursor, an AI coding editor, offers models from several companies inside its software, including OpenAI, Anthropic, Google, and SpaceXAI. Its website lists OpenAI’s GPT-5.6 Luna, Sol, and Terra models that paid users can access through its software.
