OpenAI notified SpaceX on Friday that it plans to stop supplying models directly to Cursor, the AI coding company it acquired for $60 billion on Aug. 14, with Nov. 12 proposed as the cutoff date.
OpenAI's contract with Cursor gives the Sam Altman-led firm a limited cancellation window after a change in ownership, according to the company’s announcement. OpenAI said it could not be confident that SpaceX would follow its terms "based on our experience with Elon Musk's companies violating contracts." The company plans to keep supplying the OpenAI models already available through Cursor during the transition but will withhold future models, including one of its upcoming models, currently referred to as "Astra."
The date is not final, per the announcement. OpenAI said Cursor could choose to end access sooner and that it would publish the termination date once both companies confirm it.
Cursor co-founder Michael Truell said on X that OpenAI models serve about 5% of Cursor’s user traffic.
"Cursor was one of the very first users of OpenAI, we’ve worked closely with their team for years, and we’ve trusted their platform to be neutral infrastructure for our business," Truell wrote.
Anthropic co-founder Tom Brown, meanwhile, said on X his company would continue increasing the compute available for Claude models in Cursor. Cursor also has its own Composer models and has been developing Grok models with SpaceX. Anthropic previously limited Cursor competitor Windsurf's direct access to some of its Claude models following reports that OpenAI planned to acquire the firm, though the deal would eventually fall through.
Developers could still bring an OpenAI API key to supported local Chat and Agent requests inside Cursor, per OpenAI's support page. OpenAI says its Codex extension runs separately inside Cursor and does not depend on Cursor’s model picker. OpenAI’s guidance says those options will not restore OpenAI models to Cursor Tab, Auto, cloud or background agents, automations, the CLI, or Cursor’s API and SDK.