Image: Engadget / engadget.com OpenAI Is Pulling Its Models From Cursor After SpaceX Took Over
OpenAI announced it will end model access for Cursor on November 12, citing concerns about SpaceX's history of contract violations. About 5% of Cursor users currently use OpenAI models.
OpenAI notified SpaceX on August 28 that it intends to stop supplying AI models to Cursor. The proposed end date is November 12, 2026, though OpenAI described this as a provisional transition deadline rather than a confirmed final date. Both companies still need to formally agree on the cutoff.
The decision follows SpaceX’s $60 billion all-stock acquisition of Cursor, which closed on August 14. Under SpaceX’s ownership, OpenAI says it can no longer be confident that its technology will be used within its terms of service.
Why OpenAI Is Walking Away
OpenAI invoked a change-of-control clause in its contract with Cursor, pointing to Elon Musk’s track record with other companies. Twitter violated its agreement with OpenAI after Musk took it private. Earlier this year, Musk admitted under oath that xAI had distilled OpenAI models in violation of its rules.
OpenAI also flagged that future models, including Astra, could reach what it classified as “Critical” capability levels. That made tighter control over distribution a higher priority.
The statement from OpenAI was direct: the company “cannot be confident that SpaceX will use our technology within our terms of service.”
What Changes for Developers
OpenAI models currently account for roughly 5% of Cursor’s traffic, according to co-founder Michael Truell. Most users are already on Claude, Grok, Gemini, or Cursor’s own Composer models.
For the minority who do rely on GPT models inside Cursor, the options after November 12 get narrower. Bringing your own OpenAI API key works, but only for local Chat and Agent features in the desktop app. Cloud agents, Automations, CLI access, and APIs don’t work with personal API keys. Routing through Azure or Amazon Bedrock has similar limitations.
No future OpenAI models will be made available to Cursor, regardless of how the November 12 deadline plays out.
Anthropic Steps In
Anthropic’s Tom Brown publicly described Cursor as a “trusted partner” and confirmed that Anthropic is increasing Claude compute allocation to support Cursor through the transition. Claude already handles the large majority of Cursor’s AI requests.
Truell said talks with OpenAI are ongoing and the company is working toward a resolution. It’s not clear what that would look like given OpenAI’s stated concerns about the ownership structure.
The Bigger Picture
SpaceX completed what is reportedly the largest acquisition of a venture-backed startup in history just two weeks ago. The company is building an AI stack that runs from model development at xAI through coding tooling at Cursor and into compute infrastructure with Colossus. Grok models are already available inside Cursor.
OpenAI’s move is partly practical, partly signal. It’s the same playbook the company used when it tightened restrictions on xAI and other Musk-adjacent entities. Whether Cursor can negotiate around it, or whether developers will largely not notice the loss, probably depends on whether that 5% traffic figure holds up in practice.