OpenAI ends its model contract with Cursor after SpaceX's acquisition, citing Musk's record of breaking contracts
On Aug 28, 2026 OpenAI told SpaceX it would wind down its contract supplying OpenAI models to Cursor, the AI code editor SpaceX had just acquired, with a proposed shutoff on Nov 12, 2026. OpenAI said it could not be confident SpaceX would respect its terms of service "based on our experience with Elon Musk's companies violating contracts", and that no future models, including GPT-6 Astra, would go to Cursor. Cursor CEO Michael Truell said OpenAI models were only about 5% of Cursor's AI traffic.
Key facts
- OpenAI post dated Aug 28, 2026; widely reported Aug 29
- Proposed shutoff date: Nov 12, 2026, the maximum notice OpenAI's contract allows; no new OpenAI models (including Astra) will be added to Cursor in the meantime
- OpenAI's custom agreement with Cursor let it cancel within a limited window after a change of control
- OpenAI's reasons: after Musk bought Twitter (now part of SpaceX) the company broke its contract with OpenAI; OpenAI also cites Musk's sworn admission earlier in 2026 that xAI distilled OpenAI data, and a 'new level of accountability' for how Astra is used
- Cursor CEO Michael Truell: OpenAI models are 'only about five percent' of Cursor's AI traffic; users can still use GPT models with their own OpenAI API keys (The Decoder)
- Context: SpaceX (which absorbed xAI and X) bought Cursor for a reported $60B; the deal closed Aug 14, 2026 (Cybernews); Cursor already distributes xAI's Grok models and SpaceXAI's Grok Bot
What happened
After SpaceX's acquisition of Cursor, OpenAI used a change-of-control clause to end its contract supplying models to the coding tool. It gave the longest notice the contract allows, with a proposed shutoff on November 12, 2026. In its post OpenAI pointed to the Twitter contract dispute after Musk's takeover and to Musk's sworn admission that xAI distilled OpenAI data. It also said it has "a new level of accountability" for how its upcoming Astra model is used. OpenAI called the decision "incredibly tough" and said developers who rely on its models in Cursor are the people most affected.
Cursor CEO Michael Truell played down the impact: about 5% of Cursor's AI traffic went to OpenAI models, and users can still bring their own OpenAI API keys.
Why it matters
It is a rare case of a frontier lab cutting off a major developer tool because of who owns it. It follows Anthropic's 2025 cutoff of Windsurf and of OpenAI's own API access. Model access has become a competitive weapon between labs, and developers now need to watch the ownership of their tools. For SpaceX/xAI it pushes Cursor further toward Grok models.
Changelog
- 2026-09-30: created (official-blog audit)
Related events
- SpaceXAI launches Grok Bot, always-on agent 'teammates' with their own cloud computers ★★★
- SpaceXAI releases Grok 4.6, matching GPT-5.6 Sol on the AA Intelligence Index ★★★★
- OpenAI releases GPT-6 Astra, its first GPT-6 model ★★★★★
Sources (5)
- officialOpenAI: Our decision on Cursor following its acquisition by SpaceX
- pressCNBC: OpenAI to end model access to Cursor after acquisition by Elon Musk's SpaceX
- pressThe Decoder: OpenAI cuts off Cursor after SpaceX acquisition, citing Musk's history of breaking contracts
- pressCybernews: OpenAI Cursor contract ends after SpaceX takeover
- pressTechzine: OpenAI withdraws models from Cursor following acquisition by SpaceX
id: 2026-08-28-openai-cuts-off-cursor-spacex · updated 2026-09-30 · open in the interactive timeline