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SpaceXAI launches Grok 4.5 tomorrow, pitched as a cheaper Opus rival — what's confirmed, what's a Musk claim, and how the $60B Cursor deal fits

Elon Musk said July 8 that Grok 4.5 goes public July 9 — a 1.5-trillion-parameter model he calls 'Opus-class, but faster, more token-efficient and lower cost.' It's the first flagship under the freshly-renamed SpaceXAI (xAI rebranded July 6 after folding into SpaceX), and it lands the same day OpenAI broadly releases GPT-5.6. Here's the grounded read: what's actually confirmed, why the 'Opus-class' claim needs independent benchmarks, and how the still-pending $60B Cursor acquisition factors in.