Source Credit : Portfolio Prints
OpenAI announced late Friday that it is ending developers’ access to its AI models through Cursor, shortly after Elon Musk’s SpaceX completed its acquisition of the AI coding startup earlier this month.
Cursor CEO Michael Truell confirmed the development in a post on X, saying that OpenAI’s models account for roughly 5% of Cursor’s user traffic. He said the company is in discussions with OpenAI to resolve the dispute, while emphasizing the long-standing relationship between the two companies. Cursor was among OpenAI’s earliest users, and Truell said the company had worked closely with OpenAI for years and relied on its platform as neutral infrastructure for its business.
OpenAI said it decided to terminate the arrangement because it could no longer be confident that SpaceX would use its technology in accordance with its terms of service. The company cited its previous experiences with Musk’s businesses and alleged violations of contractual agreements.
OpenAI has proposed November 12, 2026, as the date when access to its models through Cursor will be shut off. It also said that Cursor would not receive access to future OpenAI models as the partnership is wound down.
Neither Cursor nor OpenAI immediately responded to requests for additional comment.
SpaceX completed its reported $60 billion acquisition of Cursor on August 14, according to financial filings. The deal adds another major technology company to Musk’s growing business empire. SpaceX had previously acquired X and xAI in February, before SpaceX itself went public in June.
The dispute between OpenAI and SpaceX also adds another chapter to the long-running and increasingly hostile relationship between Musk and OpenAI leadership, including CEO Sam Altman and President Greg Brockman.
Musk responded on X on Saturday by dismissing OpenAI’s decision and again attacking Altman and Brockman. He repeated his longstanding allegation that OpenAI abandoned its original mission as an open-source nonprofit research organization.
Musk co-founded OpenAI in 2015 and helped fund the organization during its early years, when it operated as a nonprofit research lab. He left OpenAI’s board in 2018 following disagreements over the company’s direction and later became one of its most vocal critics.
After Musk’s departure, OpenAI grew rapidly, launching products such as ChatGPT and forming major partnerships with technology companies including Microsoft. The company subsequently developed a complex corporate structure involving a nonprofit parent and a for-profit business and attracted billions of dollars in additional funding.
Musk has argued in court that OpenAI’s restructuring violated the commitments made when the organization was founded. He has characterized the transformation as effectively taking a charitable organization and turning it into a commercial enterprise. OpenAI has rejected those claims. Although Musk lost his lawsuit earlier this year, he has said he plans to appeal.
The dispute comes as competition in the rapidly expanding market for AI-assisted programming, often referred to as “vibe coding,” intensifies. Coding platforms are increasingly integrating powerful AI models from multiple providers, making access to leading models strategically important for companies such as Cursor.
OpenAI’s decision to restrict Cursor is also not unprecedented. In June, Anthropic cut off Windsurf’s access to its Claude models, another major example of AI model providers tightening control over how their technology is distributed through third-party coding platforms.
The situation involving Cursor is particularly notable because Anthropic is now partnering with SpaceX and leasing computing capacity from Musk’s company. Anthropic co-founder and executive Tom Brown said on X that Cursor has been a trusted Anthropic partner since the release of Claude Sonnet 3.5 and that the company plans to continue increasing computing capacity to support Claude models within Cursor.
Brown’s comments drew criticism from several technology executives on X. Replit CEO Amjad Masad pointed to Anthropic’s earlier dispute with Windsurf, while Docker executive Mat Velloso suggested that Brown would have been better off not commenting on the issue.
The developments highlight a growing tension within the AI industry: model developers increasingly want greater control over how their technology is distributed, while AI applications such as Cursor depend on access to multiple competing models to provide users with the best possible experience. As major AI companies and technology platforms become increasingly intertwined through acquisitions, partnerships and computing deals, disputes over model access, contracts and competitive relationships are likely to become more common.
