OpenAI Cuts Cursor After Acquisition by SpaceX

Key Takeaways

1OpenAI plans to cut off Cursor's access to its models on November 12, 2026

2New models, including Astra, are excluded from now on

3Cursor only uses OpenAI for about 5% of its traffic and relies on other providers

4OpenAI cites a change of control clause and precedents related to Elon Musk

Why it matters : The decision limits the impact for Cursor users, but marks a break between OpenAI and entities controlled by SpaceX.

OpenAI has initiated the termination process for the contract providing models to Cursor, setting a proposed end date of November 12, 2026. The publisher, now owned by SpaceX, will retain access to existing models until November but will not benefit from new models, including Astra. Cursor states that OpenAI's share of its traffic is low and that it uses other providers.

Limited Impact: 5% of Cursor Traffic and Active Alternatives

Michael Truell, co-founder and CEO of Cursor, indicates that OpenAI's models account for about 5% of user traffic. The remainder already relies on providers not affected by the decision: Anthropic, Google, xAI, and models developed in-house by Cursor. Teams will maintain access to OpenAI's current models until November but will not receive any new models, including Astra, during the notice period.

Maximum Notice and Cutoff Still to be Confirmed

OpenAI proposes a cutoff on November 12, 2026, applying the maximum notice period allowed by the agreement, which it claims to have chosen to provide developers with as much access time as possible. The date remains presented as a proposed deadline, with teams stating they are in discussions, without guarantees of extension or maintenance. OpenAI expresses a desire to support the affected developers, without providing details on the nature of this support. The timeline offers just over two months for migration testing and validation on actual source code.

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The Basis: A Change of Control Clause and Trust Issues

OpenAI is invoking a change of control clause that provides it with a termination window following the acquisition. It does not question the product or the Cursor team, with whom it has collaborated for nearly four years, but raises concerns about compliance with its terms of use by Elon Musk's companies. Two precedents are cited: after the acquisition of Twitter, the company breached its contract terms with OpenAI; Elon Musk also acknowledged under oath that xAI violated these terms. The upcoming release of Astra is also mentioned, with OpenAI stating it is more attentive to how its models are used.

Capital Context: Cursor Integrated into SpaceX's AI Around xAI

SpaceX has owned Cursor since August 14, 2026. The AI-assisted code editor has been developed since 2022 by Anysphere. The acquisition, initiated in April after securing a purchase option and finalized following the June IPO, was settled entirely in stock for an amount of $60 billion. Cursor thus integrates the group's artificial intelligence activities, organized around xAI, which was absorbed earlier in the year. OpenAI communicated its intention to terminate the contract on Friday, August 28. Michael Truell reminds that Cursor was one of the very first users of OpenAI and trusted its platform as a neutral infrastructure.