OpenAI Cuts Off Cursor Access Following SpaceX’s $60 Billion Acquisition
In a dramatic escalation of the long-standing feud between tech titans, OpenAI announced late Friday that it is terminating developer access to its AI models for Cursor, the AI-powered coding startup recently acquired by Elon Musk’s SpaceX.
The decision effectively creates a “digital iron curtain” between the two companies, with OpenAI citing a deep-seated lack of trust regarding how Musk’s corporate empire handles its technology.
“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,” OpenAI stated in a release. The company has set a “proposed shutoff date” for November 12, 2026, and confirmed it will not provide future model updates to the platform.
A Sour Relationship
The move underscores the growing toxicity in the relationship between Musk and OpenAI leadership, specifically CEO Sam Altman and President Greg Brockman.
Musk, who co-founded OpenAI as a non-profit in 2015 before departing in 2018, has become the company’s most vocal critic. He launched a high-profile lawsuit against OpenAI in 2024, alleging that the firm abandoned its original mission in favor of a lucrative partnership with Microsoft and a move toward a for-profit structure. While Musk lost his initial legal bid earlier this year, he has vowed to appeal, recently taking to X to label Altman and Brockman as “utterly untrustworthy.”
Cursor, which relies on OpenAI models for approximately 5% of its user traffic, has expressed dismay at the cutoff. Cursor CEO Michael Truell noted that his company has been a “trusted partner” to OpenAI since its inception, adding, “We’ve worked closely with their team for years, and we’ve trusted their platform to be neutral infrastructure for our business.”
Industry Ripple Effects
The fallout from the $60 billion acquisition—finalized on August 14—has already begun to reshape the landscape of AI-assisted coding tools, often referred to as “vibe coding.”
While OpenAI has pulled the plug, rivals are rushing to fill the void. Anthropic, which currently partners with SpaceX and provides compute capacity to Musk’s ventures, has signaled its continued commitment to the platform. Tom Brown, a co-founder at Anthropic, stated that the company would continue to support Claude models within Cursor, a move that prompted sharp criticism from other tech executives who pointed to Anthropic’s own history of blocking third-party access to its models.
The timing of the dispute is particularly volatile as the industry braces for a potential market shift. OpenAI is currently preparing for a highly anticipated IPO expected next year, while competitors like Anthropic are reportedly in early talks regarding their own public offerings at valuations potentially reaching $2 trillion.
As legal and corporate tensions rise, developers using Cursor are now left to navigate a fractured ecosystem, as the bitter rivalry between the world’s most influential AI players threatens to disrupt the tools they rely on daily. For more details on the breakdown of this partnership, read the full report on the OpenAI-Cursor-SpaceX model access situation.
