SpaceXAI has launched Grok 4.5, the first model built with Cursor. Musk calls it "Opus-class" but cheaper, aimed at coding, legal and finance work.

Elon Musk said the latest version of Grok is “faster, more token-efficient and lower cost” than one of Anthropic’s models.

Grok 4.5 is SpaceXAI's smartest model built for coding, agentic tasks, and knowledge work.