Grok 4.5 Private Beta: SpaceX & Tesla Test xAI's New AI

Grok 4.5, xAI's new AI assistant, has entered private beta testing at SpaceX and Tesla. The company claims its performance is close to, and possibly exceeds, Anthropic's Claude Opus. Here's the thing: these claims cannot be independently verified. No third party has access to the model, and xAI has not submitted it to any public benchmarks. What's interesting is that Grok 4.5 is built on xAI's largest foundation model yet, with a 1.5-trillion-parameter architecture. This is a three-fold increase over the previous model. The bottom line is that while this new AI model is powerful, its capabilities are currently only assessed internally, making it hard for outsiders to judge its true performance.