Elon Musk says Grok 4.5 to launch on July 9, calls it 'Opus-class'

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.