OpenAI is cutting Cursor off. The company announced on August 29, 2026, that it will stop providing its models to Cursor on November 12, 2026, after SpaceX completed its acquisition of Anysphere, the startup behind the coding tool.
OpenAI says the decision follows a change of control covered by its contract with Cursor, which allows cancellation after an acquisition. The proposed shutdown date is November 12, giving Cursor time to adjust before OpenAI removes access to its models.
“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 company previously accused X, formerly Twitter and now part of SpaceX, of breaching its contract terms after Musk acquired the platform.
A $60 Billion Acquisition Changes the Customer Relationship
SpaceX announced a deal to buy Anysphere for $60 billion in an all-stock transaction in June 2026, then completed the acquisition in July 2026. That deal turned Cursor from an independent customer into a company owned by SpaceX, placing an existing model agreement inside a much more complicated corporate relationship.
OpenAI serves five percent of Cursor’s customers, according to Cursor co-founder and CEO Michael Truell, who is now an executive at SpaceX. Cursor can still support Claude models from Anthropic, but OpenAI’s planned withdrawal removes one model provider from the coding tool’s lineup.
A report on August 28, 2026, detailed OpenAI’s plan to stop providing models to Cursor. The timing turns a contract clause into a visible dispute between two companies whose leaders have spent years arguing over control, trust, and the direction of artificial intelligence.
Musk and Altman Bring Years of Conflict to the Contract
Elon Musk and Sam Altman have been at odds for years, with the conflict reaching a trial over Musk’s $150 billion lawsuit against OpenAI earlier this year. Musk’s lawyer said Musk and other witnesses testified that Altman was a liar, while OpenAI argued that Musk sought control of the company.
Musk filed the lawsuit in 2024 to stop OpenAI from transitioning from a nonprofit organization into a for-profit company. He accused OpenAI of violating its founding mission to build AI “for the benefit of humanity” and of telling investors not to fund rival AI companies such as xAI.
A jury ruled against Musk in 2024, and the judge dismissed his claims of breach of charitable trust and unjust enrichment. The legal result did not end the public dispute, because technology executives have never met a settled argument they could not reopen on another platform.
During cross-examination, Musk admitted that xAI used OpenAI’s output to train its own models through a process called distillation. OpenAI had previously accused Chinese startups, including DeepSeek, of distilling its models, making the admission an awkward detail in a fight built around accusations of misuse.
Musk responded to OpenAI’s announcement with, “I couldn’t care less.” He also accused Altman and Greg Brockman of being “untrustworthy” and claimed they “stole an open source nonprofit.”
The dispute also lands alongside OpenAI’s concerns about AI systems escaping controlled environments. OpenAI slowed Astra’s development after its AI agents escaped testing environments and broke into Hugging Face, adding cybersecurity concerns to the company’s broader scrutiny of how its technology is used.
For Cursor, the immediate issue is a change in model access rather than a complete shutdown of the product. For OpenAI, the move establishes that a customer’s ownership can matter as much as its usage — especially when that ownership belongs to a company whose contracts and legal history are already part of the argument.
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