OpenAI Models Leave Cursor on November 12: Inside the Cutoff That Followed SpaceX's $60 Billion Acquisition

Cursor users have five days left. OpenAI has confirmed that it will wind down the contract supplying its models to the popular AI coding tool with a proposed shutoff date of November 12, 2026, the maximum notice period its agreement allows. The cutoff is the direct consequence of an ownership change: SpaceX agreed in June to buy Anysphere, the startup behind Cursor, in an all-stock deal valued at $60 billion, and the deal closed on August 14.

OpenAI published its decision in a blog post titled "Our decision on Cursor following its acquisition by SpaceX." The company said it notified SpaceX on August 28, two weeks after the acquisition closed, and that it will not supply future models to Cursor while the agreement winds down. "We are making this choice because we cannot be confident that SpaceX will use our technology within our terms of service, based on our experience with Elon Musk's companies violating contracts," OpenAI wrote. The post pointed to the terms-of-service breach that followed Musk's acquisition of Twitter, and to Musk's sworn testimony earlier this year that xAI, now part of SpaceX, had violated OpenAI's terms.

One detail matters for anyone planning around the date: November 12 is a proposed date, not a confirmed one. OpenAI's help center describes a proposed transition period ending on that day, notes that Cursor may choose to end access sooner, and says the official date will be shared once both companies confirm it. Talks between the two sides are still ongoing, according to statements from both companies.

The practical disruption is smaller than the headlines suggest, at least by Cursor's own numbers. Cursor chief executive Michael Truell said OpenAI models serve about 5 percent of user traffic on the platform, with most users relying on Anthropic's Claude models or Cursor's own Composer models. Anthropic moved quickly to fill the gap: co-founder Tom Brown said shortly after the announcement that Anthropic would continue supporting Cursor and would further increase its compute investment to keep Claude available there.

Cursor's own subscription relaunch complicates the picture. In October the company rolled The X Subscription, a combined plan that bundles Grok, Grok Bot, Cursor and X Premium across five tiers: Free at $0, Plus at $8, Premium at $30, Super at $100 and Ultra at $200 per month. The company says the $30 Premium tier matches roughly $90 of prior standalone entitlements and that Grok coding usage is at least double what the equivalent legacy Cursor plan offered. The fine print: third-party models, including Claude and GPT, are not included in the plan allowances and are billed at API list price against prepaid credit. And a switch to the new plan is permanent, with customer support unable to reverse it.

Developers who still want OpenAI models inside Cursor have three main routes. The first is bringing an OpenAI API key, available on Premium tiers and above, which restores GPT models in local chat and agent modes with billing moved to the developer's own account. The second is OpenAI's Codex IDE extension, which runs the Codex agent inside the Cursor window independently of Cursor's model picker. The third is an AI gateway such as Amazon Bedrock or an OpenRouter-style aggregator, aimed mostly at companies that already buy OpenAI models through one. None is as seamless as the built-in picker, and none covers Tab autocomplete, background cloud agents or automations.

Cursor, meanwhile, is already moving deeper into the SpaceX ecosystem. The company has shipped Grok 4.6, the first Cursor-listed model trained on SpaceX compute, and reports say SpaceX and Cursor are preparing a jointly developed model. For the broader industry, the episode is a case study in change-of-control clauses: a single $60 billion acquisition was enough to unwind a four-year model supply relationship, and it shows that coding tools are no longer neutral ground in the competition between frontier labs.