OpenAI proposes cutting Cursor off its models as Copilot spreads agent sessions into Slack
OpenAI said on 28 August it would end Cursor's access to its models and proposed 12 November 2026 as the cut-off after SpaceX bought Anysphere in a 60 billion dollar deal. GitHub's 24 August weekly changelog opened shared Copilot agent sessions in Slack and Microsoft Teams. Cursor co-founder Michael Truell said OpenAI models make up about 5 per cent of Cursor traffic as the teams talk.
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OpenAI sets a November 2026 cut-off for Cursor model access
OpenAI said on 28 August that it is ending the agreement under which the coding tool Cursor serves its models, and proposed 12 November 2026 as the date access would stop. SpaceX completed its purchase of Anysphere, Cursor's parent company, earlier in the month, in an all-stock deal announced in June at 60 billion dollars. OpenAI says it cannot be confident SpaceX would keep to its terms of service, citing its experience with Elon Musk's companies. Reuters reporting carried in the pool notes a change-of-control clause gave OpenAI a limited window to cancel once the acquisition was complete; OpenAI's account of earlier contract trouble with Musk-owned companies is reported as its own claim.[2]
Copilot agent sessions open inside Slack and Teams
GitHub's weekly changelog for 24 August says a shared agent session can be opened in Slack and Microsoft Teams by mentioning @GitHub, turning a team conversation into a session everyone can follow and steer. The command-line tool has moved to a native Rust runtime while its terminal interface stays in TypeScript, and sessions that ended badly can be restored. The Customize tab reached general availability, gathering MCP servers, plugins, skills and canvases in one place, and Azure DevOps issues and pull requests can be turned into sessions from there. These are the company's own descriptions; no independent measurement was published.[1]
Cursor traffic share sits near 5 per cent as vendors split access paths
Cursor co-founder Michael Truell, now at SpaceX, said the two teams are talking to resolve OpenAI's notice and put OpenAI models at roughly 5 per cent of Cursor's user traffic. GitHub's changelog expands Copilot agent access through chat platforms and a Rust-backed CLI in the same week OpenAI moved to end model supply to a rival coding agent. Neither announcement reports a joint product change between the two companies.[2], [1]
