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, a rival AI company, 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, the kind of software tool that helps programmers write code faster. The trigger: SpaceX, owned by Elon Musk, completed 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 in its announcement. Developers who rely on Cursor and have built their workflows around OpenAI's models will lose that access on 12 November 2026.
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 around 5% of Cursor's total user traffic. The other 95% already runs on different AI providers.
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. He said talks with OpenAI are ongoing.
For the developers who do use OpenAI models through Cursor, the practical advice is straightforward: check which AI model your Cursor settings are pointing to before November, and switch to an alternative if needed.
What is the history between Musk and OpenAI?
This is not a simple business dispute. Musk co-founded OpenAI as a non-profit research lab in 2015 and helped fund it. He left its board in 2018 amid clashes with other board members. OpenAI later converted to a for-profit structure and launched ChatGPT, raising vast sums in the process.
Musk sued OpenAI, Altman and President Greg 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 to Friday's announcement on his social network X, Musk dismissed the move and repeated his claim that Altman and Brockman "stole an open source nonprofit."
Anthropic, which makes the Claude family of AI models and is itself a major OpenAI rival, confirmed it will continue providing models to Cursor. Anthropic co-founder Tom Brown wrote on Friday that the company would increase computing capacity to support Cursor going forward. His post drew sharp replies from other tech executives, who noted that Anthropic blocked a different coding tool, Windsurf, from its Claude models last June.
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 are not affected.
