OpenAI said on August 28 that it had notified SpaceX of its intention to terminate the contract, with a proposed cutoff date of November 12, 2026. The company said it was providing the maximum notice allowed under its agreement with Cursor.
The decision follows SpaceX’s $60 billion acquisition of Anysphere, Cursor’s parent company. Cursor announced on August 14 that the acquisition had been completed, bringing the AI coding startup under SpaceX’s ownership.
According to OpenAI, the change in ownership activated a contractual provision that gave it a limited period to cancel the arrangement. The company also said it would not provide future models to Cursor during the transition.
OpenAI Cites Contract and Safety Concerns
OpenAI said its decision was based on concerns about whether SpaceX would comply with its terms of service.
“We are making this choice because we cannot be confident that SpaceX will use our technology within our terms of service,” OpenAI said, citing what it described as previous contract violations involving companies controlled by Musk.
OpenAI will end its multi-year partnership with Cursor following SpaceX’s $60 billion acquisition, and direct access to OpenAI models will end on November 12, 2026. Source: OpenAI via X
The company pointed to its previous relationship with Twitter, which Musk acquired before it became part of the broader SpaceX organization. They also referenced Musk’s sworn testimony concerning xAI, which it said acknowledged a violation of the company’s terms.
OpenAI said agreements with large partners such as SpaceX generally contain customized provisions intended to ensure compliance and safety at scale. It said the changing capabilities of AI models have increased the company’s responsibility to monitor how its technology is deployed.
That concern also extends to Astra, OpenAI’s upcoming model. The company said it wanted to ensure that future models were used consistently with its terms and therefore would not make them available to Cursor.
OpenAI has worked with Cursor for nearly four years and said it still respects the company and its product. It also acknowledged that developers who rely on the company’s AI models through Cursor will be directly affected by the change.
“We care about their experience in this transition, and we’re ready to go above and beyond to support them,” OpenAI said.
Cursor Says OpenAI Models Account for 5% of Traffic
Cursor co-founder Michael Truell responded that the company was disappointed by OpenAI’s decision and said the two sides were still communicating.
“We’re sorry to see that OpenAI put out a note saying they plan to block Cursor users from accessing OpenAI models in three months,” Truell said.
Michael Truell, who is building SpaceXAI and previously led Cursor, responded cautiously to OpenAI’s decision to end model access for Cursor users on November 12 following SpaceX’s acquisition. Source: Michael Truell via X
Truell also said OpenAI models currently account for about 5% of Cursor’s user traffic. That figure provides some context on the potential operational impact, although it is a company-provided traffic measure rather than an independently audited assessment of revenue or usage.
Cursor has continued to support models from other major AI companies. Anthropic has indicated that it will increase computing resources for Claude models on the platform, while Cursor also offers models from other providers.
The situation therefore does not mean that Cursor itself will stop operating. Instead, the dispute concerns direct access to OpenAI models within the AI coding platform.
SpaceX Acquisition Changes Cursor’s Position
The SpaceX acquisition has significantly changed Cursor’s position within the AI industry.
Before the deal, Cursor operated as an independent AI coding company and used models from multiple providers. Following the acquisition, it became part of Musk’s expanding technology portfolio alongside SpaceX and xAI.
Cursor said the combination would give it access to SpaceX’s large computing infrastructure and allow it to develop more capable models. The company specifically highlighted Grok 4.6 as an early example of what the partnership could produce.
The acquisition also places Cursor closer to xAI, which competes directly with OpenAI in areas including generative AI and AI coding.
For OpenAI, the change in ownership created a different commercial and compliance relationship from the one it had maintained with an independent Cursor.
Musk Renews Attack on Altman
The dispute has also revived the long-running conflict between Musk and Altman.
Musk has repeatedly criticized OpenAI since leaving the company, arguing that it moved away from the nonprofit mission that originally guided its development. He later launched xAI as a competitor and pursued legal action against the company.
Elon Musk called Sam Altman “utterly untrustworthy,” accusing him of taking over an open-source nonprofit amid Apple’s legal action against OpenAI. Source: @coinbureau via X
Following the latest development, Musk again attacked Altman and OpenAI, describing Altman in highly derogatory terms and repeating his accusation that OpenAI’s original nonprofit organization had effectively been taken from its founding mission. Reuters reported that Musk also criticized the company’s president, Greg Brockman, in his response.
The remarks came against the backdrop of a broader legal and commercial dispute between the two sides. Musk’s lawsuit against OpenAI accused the company of abandoning its nonprofit purpose. The litigation has become one of the most prominent legal battles surrounding the direction and ownership of advanced AI development.
The latest confrontation is separate from that litigation, but the decision involving Cursor demonstrates how the rivalry is increasingly affecting business relationships across the AI industry.
AI Coding Competition Intensifies
The OpenAI-Cursor split comes as AI coding becomes an increasingly competitive part of the generative AI market.
Cursor has positioned itself as a multi-model development environment, allowing programmers to work with different AI systems within the same coding workflow. Losing direct access to OpenAI models could therefore reduce the range of options available to some developers, but the platform retains alternatives.
For OpenAI, the move represents a decision to prioritize control over how its models are deployed following Cursor’s change of ownership. The company said its contract allowed it to act after the acquisition and that it was using the latest possible cancellation date.
For Cursor, the relatively small share of traffic attributed to OpenAI models may limit the immediate disruption. However, the dispute illustrates the growing importance of model suppliers and ownership structures in the AI coding sector.
The situation could also strengthen competition among model providers. Anthropic has already indicated that it intends to expand its support for Cursor, potentially giving Claude a larger role on the platform.
For developers, OpenAI models will remain available through the company’s own products and API after the Cursor agreement ends. The immediate change is specifically related to their availability inside Cursor.
The proposed November 12 cutoff is not yet the end of the broader relationship, as Cursor and OpenAI continue discussions. Whether the two companies reach an alternative arrangement before that date remains to be seen. For now, however, OpenAI’s decision marks another significant development in the increasingly competitive battle among OpenAI, SpaceX, xAI, and other major players building the next generation of AI coding tools.
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