OpenAI cuts off Cursor's access to its AI models after SpaceX buys the coding tool
OpenAI says it cannot trust Elon Musk's companies to follow its rules, so it will shut down Cursor's access to its models on 12 November 2026.
Key points
- OpenAI will end Cursor's access to its AI models on 12 November 2026, following SpaceX's $60 billion acquisition of the coding tool on 14 August 2026.
- OpenAI cited "experience with Elon Musk's companies violating contracts" as the reason for the decision.
- Cursor CEO Michael Truell says OpenAI models handle roughly 5% of Cursor's user traffic.
- Anthropic has confirmed it will keep supplying its Claude models to Cursor despite the SpaceX ownership change.
- The move deepens a long-running legal and personal feud between Musk and OpenAI CEO Sam Altman.
OpenAI announced late on Friday that it will stop developers from using its AI models through Cursor, an AI-powered coding assistant that helps programmers write code faster. The trigger was SpaceX completing a $60 billion purchase of Cursor on 14 August 2026.
OpenAI's reasoning was blunt. "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," the company said. Developers who've built their workflows around OpenAI's models through Cursor will lose that access on 12 November 2026. OpenAI also said it won't provide future models to Cursor as it winds down the agreement.
What does this mean for people who use Cursor?
For most Cursor users, the day-to-day impact should be limited. Cursor CEO Michael Truell wrote on Friday night that OpenAI models currently serve about 5% of Cursor's user traffic. Truell added that Cursor "was one of the very first users of OpenAI" and described the platform as "neutral infrastructure" his team had trusted for years. Talks with OpenAI are ongoing.
We've been watching Cursor closely since July, and our 18 August story on Cursor's new code-hosting platform showed a company already working to reduce its reliance on third-party infrastructure. Friday's announcement makes that strategy look prescient.
For developers who do use OpenAI models through Cursor: check which model your settings point to before November, then switch if needed.
What is the history between Musk and OpenAI?
This isn't a simple business dispute. Musk co-founded OpenAI as a non-profit research lab in 2015 and helped fund it, then left the board in 2018 after clashes with fellow board members. OpenAI later converted to a for-profit structure and launched ChatGPT, raising vast sums in the process.
Musk sued OpenAI, Altman and Brockman in 2024, arguing the restructuring betrayed the company's founding principles. He lost that lawsuit earlier this year but has vowed to appeal. Responding on X on Saturday, Musk dismissed the move and repeated his claim that Altman and Brockman "stole an open source nonprofit."
Anthropicand OpenAI rival Anthropic confirmed it will continue providing models to Cursor. Co-founder Tom Brown wrote on Friday that the company would increase computing capacity to support Claude models in Cursor. His post drew sharp replies from other tech executives, who noted that Anthropic blocked the coding tool Windsurf from its Claude models last June, while Anthropic is now renting compute capacity from SpaceX.
First reported by CNBC Tech, the story lands as OpenAI prepares for a public stock offering next year and the market for AI coding assistants grows increasingly competitive.
Common questions
What is Cursor, and do I need to do anything?
Cursor is an AI-assisted coding tool that helps software developers write and edit code more quickly. If you use Cursor and rely on OpenAI's models specifically, you should switch to another available model before 12 November 2026.
Why can Anthropic still supply models to Cursor even though SpaceX owns it?
Anthropicand OpenAI are separate companies with their own terms of service. OpenAI's decision is specific to its own contracts and its stated history with Musk's businesses. Anthropic has chosen to continue the relationship.
Will this affect people who use ChatGPT directly?
No. OpenAI's decision applies only to developers accessing its models through Cursor's platform. ChatGPT and OpenAI's other direct products aren't affected.
