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OpenAI Cuts Off Cursor, Citing Musk as Key Reason

OpenAI announced it will terminate its contract to supply models to Cursor, citing concerns about technology misuse after Cursor was acquired by Musk's SpaceX, and pointing to past contract violations by Musk's companies. This move challenges Cursor's multi-model strategy and reflects intensifying competition in the AI industry.

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OpenAI Cuts Off Cursor: How a $60 Billion Acquisition Triggered the Model Supply Chain's "Change of Control Clause"

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On August 28, OpenAI notified SpaceX that it will terminate model access for Cursor on November 12, and made clear that future new models will no longer be supplied. On the surface it is contract terms and old grievances with Musk; in substance, after Cursor was acquired by SpaceX for $60 billion, it went from being a major OpenAI customer to a member of a competitor's camp.

  • In an August 28 announcement, OpenAI said it had notified SpaceX of terminating the contract to supply OpenAI models to Cursor, with a proposed stop date of November 12, calling this the longest notice period permitted under the existing contract.
  • The termination is based on the "change of control" clause in the custom agreement: after Cursor was acquired, OpenAI had only a limited window to decide whether to continue supplying.
  • OpenAI named Musk, saying that after Musk acquired Twitter the company violated its contract with OpenAI, and that Musk acknowledged under oath earlier this year that xAI had violated OpenAI's terms of service.
  • On June 16, SpaceX announced an all-stock acquisition of Cursor's parent company Anysphere for $60 billion, and on August 14 Cursor announced the acquisition was complete; only about two weeks passed from completion to the cutoff announcement.
  • Cursor had already developed Composer in-house, and Composer 2.5, released in May, continued training based on Moonshot AI's Kimi K2.5 open-source checkpoint; Grok 4.5 and 4.6, co-trained with SpaceXAI, have been released in succession.
  • After the cutoff, Cursor relies more on the Composer and Grok models it controls, but how the two model lines will allocate compute, personnel and budget still has no clear answer in public information.
Open section navigationCredibility Note and Conclusion

Credibility Note and Conclusion

The facts in this article mainly come from OpenAI's announcement and DeepTech Shenkeji's comprehensive reporting, among which the acquisition amount, dates and cutoff timing are publicly confirmed information; OpenAI's allegation that Musk's companies breached contract is a unilateral statement in its announcement; judgments about Cursor's internal team integration and resource allocation are speculation based on public reporting and have no clear conclusion yet.

Credibility boundary

The cutoff date, acquisition amount and timeline come from OpenAI's announcement and public reporting and are relatively credible; OpenAI's allegation that Musk's companies breached contract is its unilateral claim; judgments such as the integration of the Cursor and xAI teams and the allocation between the Composer and Grok lines are speculation based on public information and should be subject to subsequent official information.

Insight takeaway

OpenAI cutting off Cursor appears to be about a change-of-control clause and old grievances with Musk, but in substance it is a structural reversal of the model supplier-customer relationship: when Cursor was taken in by SpaceX for $60 billion, it went from being a major OpenAI customer to a member of a competitor's camp. Cursor's earlier "de-dependency" layout of developing Composer in-house and co-training Grok is therefore forced to accelerate, but how the two model lines will allocate compute and personnel remains an unsolved problem.

Sources for this version

  1. OpenAI 官宣断供 Cursor，点名马斯克是主要原因DeepTech深科技

Primary report

DeepTech深科技

Primary source