14 months ago, a frontier AI lab cut off a code editor's models in the middle of an acquisition. Six weeks later that editor was carved up and sold for parts. The lab was Anthropic. The buyer whose $3B deal died was OpenAI. Today OpenAI ran the same play on Cursor. Back in June 2025, Anthropic pulled Windsurf's Claude access with less than 5 days notice while OpenAI was closing a $3 billion acquisition of the company. Jared Kaplan said the quiet part out loud, "it would be odd for us to be…

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We’re ending our partnership with Cursor following its acquisition by SpaceX. Under our proposal, Cursor’s direct access to our models would end on November 12. We know that the people most affected by this decision are the developers who rely on OpenAI models in Cursor. We care about their experience in this transition and we’re ready to go above and beyond to support them. https://openai.com/index/our-decision-on-cursor-following-its-acquisition-by-spacex/