OpenAI Ends Cursor Model Access After SpaceX Acquisition
OpenAI is terminating model access for the AI coding tool Cursor following its acquisition by SpaceX, underscoring the commercial risks of foundational model reliance as major artificial intelligence firms prepare for public listings.
OpenAI announced late Friday that it will terminate developers’ access to its artificial intelligence models on the coding platform Cursor. The decision follows SpaceX’s $60 billion acquisition of the startup, which was completed on August 14.
OpenAI stated it cannot be confident that SpaceX will adhere to its terms of service, citing past experiences with Elon Musk’s companies violating contracts. The proposed shutoff date is November 12, 2026, and OpenAI will not provide future models to the platform as the agreement winds down.
Cursor Chief Executive Michael Truell addressed the move on the social network X, noting that OpenAI models currently serve about 5 percent of the platform's user traffic. He emphasized that Cursor has worked closely with OpenAI for years and had trusted the platform to remain neutral infrastructure for its business.
This operational split is the latest escalation in a protracted conflict between Musk and OpenAI leadership. Musk sued OpenAI, Chief Executive Sam Altman, and President Greg Brockman in 2024, alleging they misappropriated a nonprofit, though he lost the lawsuit earlier this year and has vowed to appeal.
Reacting to the shutoff announcement, Musk dismissed the decision on X, calling the executives utterly untrustworthy and using an expletive. He reiterated his long-standing claim that they stole an open-source nonprofit, a charge OpenAI firmly disputes.
Fractured AI Supply Chains
The move highlights the growing vulnerability of AI application developers who rely on third-party foundational models. As the market for AI-assisted coding tools expands, companies face increasing scrutiny over their infrastructure dependencies ahead of major public listings.
OpenAI is positioned to go public next year, while rival Anthropic has been holding preliminary meetings with bankers for a potential IPO this year. Analysts expect Anthropic could reach a valuation as high as $2 trillion, intensifying the competition for developer mindshare.
In a striking divergence, Anthropic is moving to fill the void left by OpenAI. The company is now partnering with SpaceX to rent compute capacity and will continue supporting Cursor, a sharp contrast to its decision last June to block the rival coding tool Windsurf from accessing its Claude models.
Anthropic co-founder Tom Brown affirmed the partnership on X, stating the company would increase compute to support Claude models in Cursor. However, the announcement drew swift criticism from industry peers, including Docker executive Mat Velloso, who noted it was a great opportunity for the company to stay quiet given its recent history with competing tools.
