OpenAI told developers last week that it is cutting Cursor off. The coding tool, which SpaceX bought along with parent company Anysphere for $60 billion, will lose access to OpenAI models on November 12, ending a partnership that ran close to four years. The stated reason is not price or capacity. It is that OpenAI says it does not trust an Elon Musk company to follow a contract, and it put that in writing on its own website.
The Notice Was Public and Blunt
OpenAI published the decision on August 28, writing that it intends to wind down the contract providing its models to Cursor with a proposed shutoff date of November 12, 2026. That is 75 days of notice, which is generous by industry standards and unusually public for a business to business dispute that could have been handled in an email. Companies end supply agreements constantly. They almost never publish a page explaining that the counterparty cannot be trusted, because that page becomes evidence in whatever comes next.
The Reason Given
The company wrote that it cannot be confident SpaceX will use its technology within the terms of service, based on its experience with Musk companies violating contracts. It pointed to xAI admitting under oath that it used OpenAI outputs for distillation training, and to contract problems after the Twitter acquisition. Whatever you think of the reasoning, stating it in public rather than quietly declining to renew is a choice. OpenAI also cited accountability concerns around the deployment of its more advanced systems, which is the part that reads as forward looking rather than retaliatory. SpaceX did not respond to requests for comment, and neither Musk nor Sam Altman has commented directly.
SpaceX Bought Cursor for $60 Billion
The acquisition was announced June 16 and closed August 14. It was the largest startup acquisition on record, announced in June and closed in the middle of August. Cursor is an AI coding editor, SpaceX is a rocket company, and the logic of that pairing has been debated since the day it was announced. The immediate practical consequence is that a change of control clause in the OpenAI contract came alive, and OpenAI pulled it. Change of control clauses exist for exactly this situation, and they are usually negotiated away quietly when the acquirer is friendly. This acquirer was not.
It Only Affects About 5 Percent of Traffic
Cursor co-founder Michael Truell, now a SpaceX executive, has said OpenAI models account for roughly 5 percent of Cursor’s traffic. That number reframes the whole story. This is not a product being crippled. It is a supplier walking away from a customer who was already mostly buying elsewhere. It is a symbolic separation between two companies that are increasingly competitors, dressed as a contract enforcement action. Most Cursor users will not notice anything on November 13. The people who will notice are the ones writing the next generation of these contracts.
Anthropic Moved Within a Day
Anthropic co-founder Tom Brown said on August 29 that the company will keep supplying Claude to Cursor and will increase compute to support Claude models inside it. That is a competitor publicly guaranteeing supply to a customer the day after a rival cut them off, which is about as fast as a market signal gets sent. Anthropic already supplies the majority of Cursor’s model traffic, so the offer costs it little and buys a great deal of goodwill with the developers watching.
What Cursor Users Actually Lose
After November 12, Cursor keeps Anthropic’s Claude models, Google’s Gemini models and SpaceX’s own Grok models. Most developers who use Cursor daily already default to Claude for code, which is why the 5 percent figure is credible. Grok arriving as an in house option after the acquisition also gives SpaceX an obvious incentive to make the transition painless. Users who specifically prefer OpenAI models will need to route around it or switch tools. Anyone paying for an OpenAI subscription separately can still use it, just not inside Cursor, which for most workflows means an extra window rather than a lost capability.
Talks Are Reportedly Still Open
Truell has said discussions with OpenAI continue and a resolution is possible. OpenAI itself called November 12 a proposed shutoff date rather than a final one. Both of those are the language of a negotiation, not a divorce, and the 75 day window is long enough for someone to blink. It is also long enough for Cursor to migrate anyone who cares, which may be the actual function of the notice period regardless of how the talks end.
The Bigger Pattern
This is what happens when the model layer and the application layer stop being separate businesses. Three years ago a model provider and a coding tool were natural partners with no overlap worth arguing about. OpenAI sells models and also sells coding products. SpaceX now owns a coding product and also owns a model company. Every supply relationship in that industry is now a relationship between partial competitors, and the contracts written two or three years ago did not anticipate any of it. The next round of model licensing deals will be written by lawyers who watched this one, and they will be longer, narrower and much harder to exit on a Friday afternoon.
Frequently Asked Questions
When does Cursor lose access to OpenAI models?
November 12, 2026, which OpenAI described as a proposed shutoff date.
Why is OpenAI cutting off Cursor?
OpenAI said it cannot be confident SpaceX will use its technology within the terms of service, citing prior contract problems with Musk owned companies.
Who owns Cursor now?
SpaceX, which acquired parent company Anysphere for $60 billion in a deal that closed August 14, 2026.
How much of Cursor runs on OpenAI models?
About 5 percent of traffic, according to co-founder Michael Truell.
What models will Cursor still have?
Anthropic’s Claude, Google’s Gemini and SpaceX’s Grok models.
Could the decision be reversed?
Possibly. Truell has said talks are ongoing and OpenAI framed the date as proposed rather than final.
