SpaceXAI has released the new Grok 4.5 model, with Elon Musk describing it as an "Opus-class" model that competes with last year's Claude Opus. The launch of Grok 4.5 coincides with the release of a new model by OpenAI, suggesting a competitive move in the AI market. Musk's comments indicate that Grok 4.5 is positioned as a rival to other advanced AI models, including Claude.