SpaceXAI launches Grok 4.5, its strongest model yet, co-trained with Cursor

SpaceXAI released Grok 4.5 on July 8, calling it its most capable model to date and the first trained jointly with coding tool Cursor. Pitched as Opus-class but faster, cheaper and more token-efficient, it targets coding, agentic and knowledge work. Musk says it topped several benchmarks, including the SWE software-engineering marathon. It is live in Cursor, Grok Build and the SpaceXAI console; EU access follows mid-July.