Grok 4.5 goes public tomorrow, Elon Musk says: V9 foundation at ~1.5 trillion parameters

According to Muskonomy, citing Elon Musk on X on July 8, 2026, Grok 4.5 is set to go public the next day. The model runs on the SpaceXAI V9 foundation at roughly 1.5 trillion parameters—about three times the size of the model powering Grok today.

What Grok 4.5 promises

• Opus-class, faster: Musk calls it an “Opus-class” model (referencing Anthropic’s top Claude tier) but faster, more token-efficient, and lower cost.
• Coding gains: Cursor data was added during supplemental training to sharpen programming performance.
• Internal beta: Grok 4.5 entered private beta at SpaceX and Tesla on June 28; the public release follows 11 days later.
• Positive feedback: Musk cites strong positive feedback from customers in the private beta ahead of the wide rollout.

Context

Grok is xAI’s AI assistant, integrated into Tesla vehicles, the mobile app, and other Musk-ecosystem products. A jump to ~1.5 trillion parameters would place Grok 4.5 among the largest frontier models, though Musk has not yet published independent benchmarks—Muskonomy notes that may change once the public release lands.

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