OpenAI announced it will end model access for Cursor by Nov. 12, 2026, citing concerns that new owner SpaceX will not comply with its terms of service — the latest flashpoint in the long-running conflict between Elon Musk and OpenAI's leadership.
OpenAI announced Friday that it is terminating developers' access to its models through Cursor, the AI coding platform acquired by Elon Musk's SpaceX earlier this month, setting a proposed cutoff date of Nov. 12, 2026.
The decision stems from OpenAI's stated concern that SpaceX cannot be trusted to operate within its contractual terms. "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 said in its announcement. The company also said it would not supply future models to Cursor as the agreement winds down.
SpaceX completed its $60 billion acquisition of Cursor parent company Anysphere on Aug. 14, according to financial filings.
Cursor CEO Michael Truell sought to minimize the operational impact of the move. "OpenAI models serve about 5% of Cursor user traffic, and we're speaking with the OpenAI team to resolve this," Truell wrote in a post on X, the SpaceX-owned social network. "Cursor was one of the very first users of OpenAI, we've worked closely with their team for years, and we've trusted their platform to be neutral infrastructure for our business."
Musk responded on X on Saturday, writing, "I couldn't care less," and using an expletive to describe OpenAI CEO Sam Altman and President Greg Brockman. He repeated his characterization of the organization as having "stolen an open source nonprofit" — a claim OpenAI disputes.
The split reflects a years-long and deeply personal conflict between Musk and OpenAI's leadership. Musk co-founded the organization as a non-profit research lab in 2015 alongside Altman, before departing its board in 2018 amid disputes over talent, donations, and strategic direction. He filed a lawsuit against OpenAI, Altman, and Brockman in 2024, arguing the company's conversion to a for-profit structure violated its founding commitments. A court ruled against him earlier this year, though Musk has vowed to appeal.
The move is not without precedent in the AI tools space. Anthropic cut off Windsurf's access to its Claude models last June — a parallel that drew pointed commentary on social media Friday night. Anthropic co-founder and executive Tom Brown wrote on X, "Cursor has been a trusted partner of Anthropic since Sonnet 3.5. We'll continue to increase compute to support Claude models in Cursor and are excited for what comes next with them at SpaceX." The post drew pushback from other technology executives, including Replit CEO Amjad Masad, who referenced Anthropic's own history with Windsurf.
Notably, Anthropic is now partnering with SpaceX and renting compute capacity from Musk's company — a dynamic that adds another layer of complexity to the competitive realignment underway among AI infrastructure providers.
The dispute arrives as the market for AI-assisted coding tools grows increasingly competitive, and as both OpenAI and Anthropic look toward public listings. OpenAI is expected to go public next year, while Anthropic has been holding preliminary discussions with bankers ahead of a possible IPO, with an expected valuation as high as $2 trillion, according to earlier reports.
With SpaceX now controlling Cursor's product roadmap — and OpenAI's model access expiring in November — the question of which AI providers will power the platform going forward is likely to shape how Cursor competes in an expanding field.
Marc Sabatini is a staff writer at TechEchelon covering enterprise software, cybersecurity, and the regulatory beats that shape both. He focuses on the deal flow and policy decisions that move markets.
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