Overview
- Multiple outlets report that SpaceXAI (formerly xAI) and Cursor planned a model release this week but a company memo said the launch was delayed by a few days to improve efficiency.
- The model is described as a jointly developed system that incorporates Cursor data and is touted internally as comparable to Anthropic’s Claude Opus 4.8 and OpenAI’s GPT‑5.5.
- Elon Musk confirmed that Grok 4.5 — a 1.5 trillion‑parameter V9 foundation model with supplemental Cursor training — is in private beta at SpaceX and Tesla and said early internal tests show Opus‑class performance.
- Reports say the training used SpaceXAI’s Colossus supercomputing infrastructure and that SpaceX is pursuing a reported acquisition of Cursor in a deal described in coverage as roughly $60 billion.
- Public availability and independent benchmarking remain unresolved, so the claims about speed, cost and accuracy rest on company statements and private tests rather than third‑party verification.