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OpenAI will end its Cursor partnership after November 12, 2026, following SpaceX’s acquisition of Cursor’s parent company, Anysphere. OpenAI notified SpaceX on August 28 and cited concerns over contract compliance.
The decision affects Cursor users worldwide who access OpenAI models through the coding platform. OpenAI will stop direct model access after the notice period, following a change of control clause.
OpenAI said SpaceX may not follow its terms of service, based on past Musk company disputes. The ChatGPT maker linked concerns to X and xAI, which operate within Musk’s wider business empire.
OpenAI said the move protects model usage rules while giving developers maximum transition time. The company also confirmed that Cursor will not receive future OpenAI models, including Astra.
OpenAI described the decision as “incredibly tough” while stressing broad developer access. The company said custom contracts help large partners follow safety and usage requirements.
OpenAI also alleged that X previously broke contractual terms after Musk acquired Twitter. It further cited Musk’s testimony regarding xAI’s use of OpenAI outputs for model training.
Musk responded sharply on X after OpenAI announced the contract wind down. He wrote, “I couldn’t care less,” while calling Sam Altman and Greg Brockman “untrustworthy.”
Musk also repeated his claim that OpenAI leaders “stole an open source nonprofit.” The remarks add another public clash to the long-running Altman-Musk dispute.
SpaceX completed its $60 billion all-stock acquisition of Anysphere earlier this month. Cursor cofounder Michael Truell said discussions with OpenAI continue as both sides explore resolution. Anthropic also plans stronger Claude support for Cursor, creating another option for developers.
The dispute shows how ownership changes can reshape access to major AI models. Cursor now faces a November deadline while OpenAI and Musk remain locked in competition.
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