What happened
OpenAI announced it is ending its partnership with Cursor, following Cursor's acquisition by SpaceX. Under OpenAI's proposal, Cursor's direct access to OpenAI models would end on November 12.
Why it matters
OpenAI cites 'our experience with Elon Musk's companies violating contracts' as the leading reason. This follows years of public acrimony between the leaders and a failed lawsuit this year, and it reflects both companies' growing independence—Cursor now relies on OpenAI for only 5% of its traffic, and SpaceX's Grok 4.6 is now a viable coding competitor.
What to watch
Cursor's response has been diplomatic, saying OpenAI models serve about 5% of Cursor user traffic and that they are speaking with OpenAI to resolve the issue. The decision may not be final, as Cursor has not accepted it as such.
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This move echoes OpenAI's earlier treatment of Windsurf when it was considered for acquisition, showing a pattern of cutting off partners that fall under Elon Musk's umbrella. The decision marks a turning point: a year ago, Cursor was featured in the GPT-5 launch video, and OpenAI cutting it off was unthinkable because Claude models were far ahead in coding. Today, GPT 5.6 is a serious coding alternative, and SpaceX's Grok 4.6 has become a viable coding model, making competition plausible. Cursor's low dependence on OpenAI (5% of traffic) suggests it can weather this change, but the negotiation is ongoing. The outcome may depend on whether Musk's companies can avoid contract violations in the future, as per OpenAI's stated reasoning.
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