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OpenAI to cut off Cursor's model access Nov. 12 after SpaceX buyout

The cutoff shows AI labs now treat model access as a lever in corporate rivalries, not just a commercial contract.

• OpenAI told SpaceX on August 28, 2026 that it will wind down its contract supplying models to Cursor, with a proposed shutoff date of November 12, 2026.
• Cursor, built by startup Anysphere, is a popular AI coding assistant that SpaceX acquired in an all-stock deal valued at $60 billion, completed August 14, 2026.
• OpenAI says it can't trust SpaceX to follow its terms of service, pointing to Twitter/X's past contract breach and Elon Musk's sworn admission that xAI violated OpenAI's terms.
• OpenAI's forthcoming Astra model will not be offered to Cursor at all, and the company says it gave the maximum contractual notice period before cutting access.
• Cursor CEO Michael Truell said OpenAI models power only about 5% of Cursor's user traffic, suggesting the practical impact on the product may be limited.
• Anthropic, which also partners with SpaceX, said it would boost compute support for Claude models in Cursor, while Musk responded on X that he 'couldn't care less.'
• The move signals AI providers may now withhold model access based on corporate ownership and rivalry, adding a new supply-chain risk for developers building on any single vendor's models.