OpenAI Pulls the Plug on Cursor Over Musk's History of Breaking Contracts

A $60 Billion Deal Triggers a Corporate Breakup

OpenAI has announced plans to wind down its agreement supplying AI models to Cursor, the popular AI coding platform recently acquired by Elon Musk's SpaceX — and the reasoning is blunt. "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.

The decision follows SpaceX's $60 billion acquisition of Anysphere, Cursor's parent company, which was announced as completed on August 14. According to OpenAI, the change in ownership activated a contractual provision that gave it a limited period to cancel the arrangement. That window didn't stay open long. OpenAI moved quickly, and the message it sent was hard to miss: owning Cursor now means answering for Musk's track record.

A Paper Trail of Broken Agreements

According to OpenAI, after Musk acquired Twitter — now known as X — the social media company breached the terms of its contract with OpenAI, alongside contracts with other companies. OpenAI had a licensing deal with Twitter that gave the company access to the full tweet data feed for about $2 million a year to train ChatGPT. When Musk found out about the agreement in December 2022, he thought the price was too low and cut off OpenAI's access.

Musk also admitted during a legal battle that he used data from other labs' AI models to train his own Grok models, a practice known as "distillation" — which also violates OpenAI's terms of service. OpenAI further noted that Musk acknowledged under oath earlier this year that xAI had violated OpenAI's terms of service, and that xAI is now also part of SpaceX. In OpenAI's view, the pattern is clear and consistent enough to justify cutting ties entirely.

What This Means for Cursor Users

OpenAI announced it will terminate its contract with Cursor effective November 12, 2026 — the maximum notice period allowed under the contract. OpenAI also said it would not provide future models to Cursor as it winds down the agreement. That's a meaningful blow to a platform that has become a go-to tool for developers using AI to write and edit code.

Users who access GPT models through Cursor will still be able to use their own OpenAI API keys, and OpenAI will continue to provide access through its IDE extensions for Cursor. The termination will affect Cursor's access to OpenAI models, although the coding platform also offers models from other AI companies. Cursor co-founder Michael Truell said discussions with OpenAI were continuing. For everyday users, the practical disruption may be limited — but the signal sent to the broader industry is loud.

The Feud That Just Won't End

OpenAI's move away from Cursor is part of a long-running and acrimonious clash between Musk and OpenAI CEO Sam Altman and President Greg Brockman. Musk has argued in court that OpenAI's restructuring violated its founding commitments, describing the change as "stealing a charity." OpenAI disputes his claims, and while Musk lost his lawsuit earlier this year, he has vowed to appeal.

Responding to the proposed contract termination, Musk said he was indifferent to the decision and described OpenAI's leadership as "untrustworthy." As the market for AI-assisted coding tools heats up, OpenAI is poised to go public next year, while rival Anthropic has been holding preliminary meetings with bankers ahead of a possible IPO at an expected valuation as high as $2 trillion. With billions of dollars and enormous competitive stakes on the line, this breakup is less a business dispute and more a preview of how the AI industry's biggest rivalries will shape who gets access to the most powerful technology — and who doesn't.