SpaceXAI has officially launched Grok 4.5, offering free access to the AI model for a limited period. Users can start using Grok 4.5 through two main options. The first option, Cursor, requires users to sign up and select Grok 4.5 from the model list in the chat or Composer panel, available on all Cursor plans. The second option, Grok Build, provides a more comprehensive coding experience. Users can access it by entering a terminal command, which initiates a browser sign-in with an xAI account. Once signed in, users can navigate to any project directory and run the interactive terminal agent to utilize Grok 4.5.