SpaceXAI and Cursor plan to release their first jointly developed artificial intelligence model as soon as Wednesday, weeks after SpaceX moved to buy the code editor for $60 billion. The launch was delayed earlier this week so engineers could improve the model's efficiency. Internal testing compares the system with Anthropic's Claude Opus 4.8 and OpenAI's GPT 5.5. SpaceX agreed in June to acquire Cursor for $60 billion in an all-stock deal, and the transaction is expected to close in the third quarter. The model is set to ship inside both Cursor and Grok Build, the company's developer platform. Elon Musk posted on Jun. 28 that Grok 4.5, an unreleased model built on the company's 1.5 trillion parameter V9 foundation, had entered private beta at SpaceX and Tesla, with early evaluations showing performance close to, and perhaps exceeding, Anthropic's Opus tier, with Cursor data added through supplemental training. Those claims remain unverified, and no independent benchmark has scored Grok 4.5. Cursor founder Michael Truell described a Cursor-built model last month as the next phase of the company. Shares of SpaceX closed down 7% on Tuesday after the company asked regulators for permission to launch up to 100,000 third-generation Starlink satellites, and edged up 2% in after-hours trading. SpaceX absorbed xAI, rebranded the unit as SpaceXAI, and announced