Anthropic Increases Cursor Computing Power, OpenAI Plans to Cut Supply in November
OpenAI announced that due to Cursor being acquired by SpaceX, it plans to terminate direct model provision to the programming tool on November 12, 2026. The reason cited is a lack of confidence that SpaceX will adhere to service terms based on past experiences with Elon Musk's company. The contract includes a limited termination window after a change of control, and the company stated it has provided notice at the maximum limit, and will not provide subsequent models Astra to Cursor.
Cursor CEO Michael Truell stated that OpenAI models account for about 5% of the product's user traffic and that they are in communication with OpenAI. SpaceX acquired Anysphere, the company behind Cursor, in a $60 billion all-stock deal in June, completing the transaction earlier this month. Musk responded that he is indifferent.
Hours later, Anthropic co-founder and head of computing Tom Brown wrote that Cursor has been a trusted partner since Claude Sonnet 3.5 and will continue to increase computing power to support the Claude model in Cursor, expressing excitement about the next steps with SpaceX. Reuters described this as increasing computational support for Cursor after OpenAI cuts supply.
This is not the first time a lab has switched interfaces due to an acquirer. In 2025, when there were rumors of OpenAI potentially acquiring Windsurf, Anthropic cut off direct access to Claude for that product, with some management stating that selling Claude to OpenAI would seem strange. Anthropic currently has a computing power leasing partnership with SpaceX. As a result, developer tools have shifted from a multi-model neutral pipeline to contracts rewritten with changes in control.
OpenAI emphasized that its collaboration with Cursor has lasted nearly four years, and the decision is based on governance risks and future model accountability post-acquisition, rather than a denial of the product itself. Before the cut-off date, models can still be switched within the editor, but new generation capabilities are explicitly excluded. Once the 5% traffic interface is closed, the default path will further lean towards suppliers who are still increasing quotas.
In market mechanics, the buyer is the developer who has embedded workflows into Cursor, while the seller is the lab renting out models as infrastructure. The event was triggered by the change of control clause. Funding and token usage will shift from the OpenAI interface to Claude quotas and proprietary models within the SpaceX system. Benefiting from this is Anthropic, which can increase presence in the same editor, while the application layer that relied on a neutral pipeline faces pressure.
Source: Public Information
ABAB AI Insight
Once model companies feel that downstream may be written into training data or terms loopholes by competitors, interfaces become weapons. OpenAI's exit using the change of control clause writes SpaceX and Musk's litigation history into the business memorandum. Anthropic has performed similar mirroring operations on Windsurf: those who get close to OpenAI lose direct access to Claude. This time, with SpaceX as the acquirer, Anthropic is increasing quotas, acknowledging that the editor's entry point is more valuable than a single moral stance. The 5% traffic figure for Cursor reduces the supply cut from a product apocalypse to a vendor rotation, but Astra's absence means that next-generation capabilities are physically isolated outside the editor.
The capital path is that the $60 billion stock deal brings the application layer into the aerospace and AI group, with the lab deciding whether to continue powering the entry based on the terms window. The head of computing, rather than a policy officer, addressing this indicates that the decision unit is the GPU schedule, not a PR statement. Anthropic rents computing power from SpaceX and sells inference to the editor controlled by SpaceX, forming a closed loop: electricity comes from Musk's system, and models occupy the window developers open daily. OpenAI retains the model but loses the default key.
Similar structures are seen in cloud vendors cutting APIs due to competition, payment networks exiting merchants due to compliance, and mobile systems taking cuts from super apps. The coding assistant industry is transitioning from a multi-model shelf to binding a single upstream. The acquisitions of Windsurf and Cursor provide the same lesson: the higher the application layer valuation, the shorter the model contracts.
The essence is the transfer of pricing power. Whoever controls the window where developers code daily controls the distribution tax of the next-generation model. The mechanism is: the change of control clause turns mergers into supply cut switches; the remaining suppliers exchange increased computing power for default paths; and the neutral infrastructure automatically ends neutrality the day the buyer becomes a competitor.
ABAB News · Cognitive Laws
Once control changes, neutral interfaces cease to be neutral.
Traffic accounting for only 5% can still determine whether the next-generation model enters the editor.
Cutting off a competitor's entry is another form of quoting for increased computing power.