OpenAI will wind down Cursor model access after SpaceX closed the deal

OpenAI said on Friday 28 August 2026 that it has notified SpaceX it intends to wind down the contract that provides OpenAI models to Cursor, with a proposed shutoff date of 12 November 2026. The company published the decision in an official post, Our decision on Cursor following its acquisition by SpaceX.

The move is a change-of-control cut, not a product deprecation of Cursor itself. Cursor’s own company blog said on 14 August 2026 that Cursor is now a part of SpaceX, completing an acquisition process that began in April. OpenAI wrote that its custom agreement with Cursor “gives us a limited time window to cancel it after a change of control,” and that it is giving “the maximum notice provided by our contract” so developers can keep using OpenAI models through Cursor until the proposed date.

Why OpenAI is leaving

OpenAI framed the decision around terms-of-service risk after SpaceX took control. “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,” the company wrote.

It pointed to two prior episodes in the same post: after Musk acquired Twitter, “now part of SpaceX,” OpenAI said the company “broke the terms of our contract (alongside many others).” It also said that under oath earlier this year, Musk “admitted that xAI, now also part of SpaceX, had violated OpenAI’s terms of service (terms which are similar to xAI’s own).”

The lab tied the cutoff to its next frontier model as well. “As AI capabilities advance, we also have a new level of accountability to ensure our upcoming model, Astra, is being used in accordance with our terms.” OpenAI said it will hold the cancellation to the latest date it can “while not providing future models to Cursor.” Existing model access, under the proposed schedule, continues until 12 November.

OpenAI said it has worked with Cursor for nearly four years and that “the people most affected by this decision are the developers who rely on OpenAI models in Cursor.” It added that it is “ready to go above and beyond to support them.”

What Cursor and Anthropic said

Coverage in The New Stack (30 August 2026) quoted Cursor co-founder and CEO Michael Truell on X: “OpenAI models serve about 5% of Cursor user traffic, and we’re speaking with the OpenAI team to resolve this.” Truell also said Cursor “was one of the very first users of OpenAI,” had worked closely with the team for years, and had “trusted their platform to be neutral infrastructure for our business.”

Anthropic did not follow OpenAI out the door. The same New Stack report quoted Anthropic co-founder and chief compute officer Tom Brown on 29 August: “Cursor has been a trusted partner of Anthropic since Sonnet 3.5. We’ll continue to increase compute to support Claude models in Cursor and are excited for what comes next with them at SpaceX.”

That stance sits next to a separate, older commercial link. On 6 May 2026 Anthropic said it had signed an agreement with SpaceX to use all of the compute capacity at their Colossus 1 data center—more than 300 megawatts and over 220,000 NVIDIA GPUs—and that the extra capacity would improve service for Claude Pro and Claude Max. A follow-up New Stack analysis on 31 August noted the contrast with Anthropic’s earlier cuts of Claude access around Windsurf and xAI, and argued SpaceX now sits in an “enviable position” because it owns both xAI and Cursor while Anthropic buys Colossus capacity from the same group.

What it means for coding agents

For teams that run OpenAI models inside Cursor, the practical clock is the proposed 12 November shutoff for current models, plus an already-stated bar on future OpenAI models, including Astra. Cursor users can stay on the editor with other model providers; Anthropic has said publicly it will keep increasing Claude compute there. OpenAI, for its part, is pointing developers toward a transition rather than an indefinite mixed stack inside SpaceX-owned Cursor.

None of this is a claim that talks are over. Truell said Cursor is still speaking with OpenAI. Until those talks change the written notice, the official record is OpenAI’s 28 August post: maximum contractual notice, no future models, proposed cutoff 12 November 2026.

Source: OpenAI, 28 August 2026. Also: Cursor, 14 August 2026; The New Stack, 30 August 2026; The New Stack, 31 August 2026; Anthropic, 6 May 2026.