In its August 28, 2026 company announcement, OpenAI says it has notified SpaceX that it intends to wind down the contract supplying OpenAI models to Cursor, with a proposed shutoff date of November 12, 2026. OpenAI says the decision follows concerns that SpaceX may not use its technology within the company’s terms of service, putting developers who rely on OpenAI models through Cursor at the center of the transition.

Source: Our decision on Cursor following its acquisition by SpaceX · OpenAI

A proposed November 12, 2026 cutoff

OpenAI says the date is the latest point it can use under the agreement while giving developers the maximum notice available. That is intended to preserve access to its models through Cursor for as long as the contract permits, rather than ending the arrangement immediately.

The company also says it will not provide future models to Cursor. This means the decision concerns both the eventual end of the existing arrangement and the availability of upcoming OpenAI releases through the developer tool.

Why OpenAI is ending the arrangement

OpenAI describes the decision as a compliance question involving a major partner. It says large partnerships typically use custom contracts to set expectations around terms-of-service compliance and safety at scale. Under the Cursor agreement, the company says it has only a limited window to cancel after a change of control.

OpenAI says its confidence was also shaped by what it describes as contract violations involving Elon Musk’s companies. The announcement points to the period after Musk acquired Twitter, which it describes as now part of SpaceX, and cites Musk’s testimony under oath earlier in 2026 that xAI, also described in the announcement as part of SpaceX, had violated OpenAI’s terms. OpenAI presents these events as the basis for its decision not to provide future models to Cursor.

The company also says the advancing capabilities of its upcoming Astra model create a higher level of accountability around how its technology is used. That concern, combined with the contract’s change-of-control provision, led OpenAI to hold cancellation until the latest permitted date while stopping future-model access.

What the change means for Cursor developers

OpenAI identifies developers who depend on its models in Cursor as the people most directly affected. The immediate practical issue is model continuity: access through the current arrangement may continue during the notice period, but future OpenAI models will not be supplied to Cursor under the contract.

OpenAI says it has enormous respect for Cursor’s team, product, and developer community. It also says it is prepared to go above and beyond to support developers during the transition. The announcement does not specify those support measures or name a replacement arrangement, so the proposed November 12 cutoff and the commitment to assist affected users are the main concrete details currently provided in the notice.