SpaceXAI to release a major new model with Cursor this week

xAI — now officially rebranded SpaceXAI following SpaceX's February acquisition and IPO — is teeing up a major model release, reportedly in partnership with Cursor, as soon as this week. Elon Musk said Grok 4.5 is built on a 1.5-trillion-parameter V9 foundation model with Cursor data included in supplemental training, and is being beta tested internally at SpaceX and Tesla with performance he compared to a version of Claude Opus.

The Cursor tie-in is the interesting mechanism: training a coding-focused model on data from a leading AI code editor, then shipping the model back into that editor, creates a tight product loop that OpenAI (Codex), Anthropic (Claude Code) and Google are all racing to own. If the collaboration is real, it gives SpaceXAI instant distribution to Cursor's developer base.

The rebrand itself is more than cosmetic — folding xAI into the SpaceX corporate structure changes the funding and compute story, and a new logo has already rolled out. Musk separately touted an 'AI+Optimus' healthcare vision in a widely-shared post (17.6K likes), keeping xAI's ambitions maximalist.

Hugging Face CEO Clement Delangue publicly goaded Musk to open-source the Cursor model, arguing it would be 'a massive contribution' to closing the gap between American and Chinese open source — a pointed jab given the week's China-model anxiety. Watch whether the release actually ships this week, whether it's open-weight, and whether the Opus-class performance claim survives contact with independent benchmarks. xAI has a history of ambitious pre-announcements that arrive later and smaller than billed.