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xAI deploys Grok 4.5 at Tesla and SpaceX as Elon Musk bets his own companies on a 1.5 trillion-parameter challenger

Grok 4.5, built on xAI's 1.5 trillion-parameter V9 foundation model, entered private beta at SpaceX and Tesla on June 28. Elon Musk claims early evals show performance matching or exceeding Anthropic's Claude Opus, while the integration of Cursor training data signals a direct push into developer tooling. xAI also announced monthly frontier model releases through the end of 2026.