Elon Musk unveils Grok 4.5 built on 1.5‑trillion‑parameter V9 model with Cursor data

Elon Musk posted a tweet announcing the release of Grok 4.5. The new version runs on a 1.5‑trillion‑parameter V9 foundation model. Cursor data has been incorporated into the model. The update is presented as an improvement over prior Grok releases. Grok serves as the AI assistant for X platforms. Musk highlighted the technical upgrade but gave few specifics. No timeline for broader availability was disclosed. Industry watchers will monitor performance and integration details.