xAI is speeding up development amid the race for the fastest and cheapest model in the AI space. Grok 4.5 first surfaced in private beta at Tesla and SpaceX in June, with Musk putting its early performance close to, and potentially above, Anthropic's Claude Opus.

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

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