Grok 4.5 is now officially available in Grok Build......try it now

Grok 4.5, an updated version of xAI's conversational AI model, has been officially released and is now accessible through Grok Build, xAI's development platform. The announcement encourages users to test the new model version, which likely includes performance improvements, enhanced capabilities, or additional features over previous iterations.

Source: Elon Musk (X) | 2026-07-08