xAI's Grok 4.5 Enters Private Beta at SpaceX and Tesla With 1.5 Trillion Parameters and No Public Benchmarks

Minds, Bodies, and Terawatts · Jun 30, 2026 · 3m · transcript

Elon Musk announced June 28 that xAI's Grok 4.5, a 1.5-trillion-parameter model built on the V9 architecture, has entered private beta testing exclusively at SpaceX and Tesla. Musk claims performance may exceed Anthropic's Claude Opus, but no independent benchmarks exist. xAI plans monthly model releases through end of 2026 while posting a $2.47 billion operating loss in Q1.

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