OpenAI announced it will end its contract supplying AI models to Cursor, a coding startup recently acquired by SpaceX for $60 billion. Citing deep-seated trust issues and past contract violations by Elon Musk-owned entities including Twitter and xAI, OpenAI set a shutoff date of November 12, 2026.
The decision marks a sharp escalation in the long-running feud between OpenAI Chief Executive Sam Altman and SpaceX founder Elon Musk. Under a custom agreement governing the partnership, OpenAI invoked a specific provision allowing the company to cancel the contract following a change of corporate control.
Trust Issues and Prior Contract Violations
OpenAI stated that it cannot be confident SpaceX will adhere to its terms of service. According to Business Insider, the company pointed directly to past conduct by Twitter—acquired by Musk in 2022 and merged with SpaceX in February—which allegedly broke its contract data terms.
The AI firm also cited sworn testimony from earlier this year, where Musk admitted under oath that his artificial intelligence venture xAI had violated OpenAI terms by training the Grok model on OpenAI outputs. To support large-scale partnerships, OpenAI noted that it typically relies on specialized agreements designed to enforce safety and compliance at scale.
“This decision was incredibly tough, as we care deeply about our models being broadly available for developers. 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, official statement
Impact on Developers and Future Models
Cursor, an AI coding editor developed by Anysphere, integrates models from multiple providers including Anthropic, Google, and SpaceXAI, alongside OpenAI offerings such as the GPT-5.6 Luna, Sol, and Terra models. While developers utilizing the platform retain access for now, CNBC TV18 reported that direct access to OpenAI models will cease on November 12, 2026.
Furthermore, Digit reported that Cursor will be blocked from receiving future OpenAI models, specifically naming the upcoming Astra model. OpenAI expressed strong respect for the Cursor team and the developer community, emphasizing that it chose the latest possible cancellation date allowed by the contract to give engineers maximum time to adapt.
Reactions from Musk, SpaceX, and Competitors
Elon Musk responded to the announcement with characteristic indifference on his social media platform. According to Reuters, Musk wrote that he couldn’t care less
and accused Altman and OpenAI President Greg Brockman of being untrustworthy while reiterating his long-standing assertion that they misappropriated an open-source nonprofit organization.
Michael Truell, a co-founder of Cursor and currently an executive at SpaceX, stated that the startup is actively communicating with the OpenAI team to resolve the dispute as reported by Livemint. Meanwhile, competing AI lab Anthropic moved swiftly to capitalize on the rift, announcing plans through co-founder Tom Brown to increase compute support for Claude models within Cursor.
Broader Stakes in the Musk-Altman Feud
The sudden severance of the Cursor agreement represents another chapter in the bitter legal and personal confrontation between Musk and OpenAI’s leadership. Musk filed a lawsuit in 2024 targeting OpenAI and Altman over the organization’s commercial transformation. Although a federal jury ruled against Musk earlier this year after finding he missed the statute of limitations, Musk has signaled his intent to appeal the verdict.
As the November deadline approaches, software developers relying on Cursor must navigate a shifting ecosystem where corporate acquisitions and fierce industry rivalries directly alter the tools available for daily engineering work.
