OpenAI Cut Off a Billion-Dollar Customer to Avoid Elon Musk
OpenAI has ended its partnership with Cursor, the AI coding editor, after Elon Musk's SpaceX acquired the company, choosing to sacrifice significant revenue rather than continue supplying its models to a Musk-controlled business. The move highlights the depth of OpenAI's distrust of Musk, with the firm citing past instances of "Elon Musk's companies violating contracts" and concerns that SpaceX could misuse its technology, including possibly using OpenAI's models to help train Musk's rival AI venture, xAI.
Cursor had been one of OpenAI's top five customers by revenue at the start of 2026, and by spring OpenAI estimated the partnership could generate over $1 billion in annualised revenue. OpenAI, which reportedly now earns more than $40 billion annually across subscriptions, advertising and its Codex coding tool, is seeking to present a stable business ahead of a planned stock market listing next year. Cursor chief executive Michael Truell, who now also leads teams at SpaceX, pushed back publicly, claiming OpenAI's models made up only about 5% of Cursor's user traffic, a figure OpenAI's product chief disputed as not reflecting actual value or revenue. The split follows a long history between the firms, including OpenAI's early investment in Cursor's 2023 seed round and a reported prior acquisition approach.
In short
- OpenAI dropped Cursor as a customer after SpaceX bought it.
- Move could cost OpenAI over $1 billion in annual revenue.
- Decision driven by distrust of Musk, ahead of OpenAI's planned IPO.
Steelman: both sides, in good faith
The strongest fair case each way — we don't pick a winner.
The case for
OpenAI can argue that supplying a Musk-controlled company carries unusual contractual and strategic risks, especially if its models or outputs could help train a direct rival. Ending the deal protects its technology and gives customers and investors a signal that it will enforce its agreements, even at a substantial revenue cost.
The case against
Cursor and critics can argue that ending a major commercial partnership because of distrust tied to its new owner risks looking like a relationship-driven decision rather than a proportionate response to demonstrated misuse. They may also question whether the stated risk justified the lost revenue, particularly given Cursor’s claim that OpenAI models accounted for only a small share of its traffic.
Explained simply
OpenAI is an artificial intelligence company that makes models used in products such as ChatGPT and coding tools. Cursor is a coding editor that lets users work with AI models to help write and change software. It has also used models supplied by OpenAI.
Elon Musk helped found OpenAI but later left and became a critic of the company. He now leads SpaceX, which acquired Cursor, and runs xAI, an AI company that competes with OpenAI. That puts OpenAI’s technology in a business connected to a direct rival.
The relationship had also been commercial: Cursor was a major OpenAI customer, and OpenAI had invested in Cursor early on. The dispute matters because it brings together questions about business revenue, trust between former partners and how AI companies manage access to technology that could benefit competitors.
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