Musk Says Grok 4.5 Enters Private Beta at SpaceX and Tesla

What happened

Elon Musk announced on June 28 that xAI's Grok 4.5 has entered private beta restricted to internal use at SpaceX and Tesla.

Context and impact

Musk claims early evals approach or beat Claude Opus, and Cursor data is being used to sharpen technical reasoning. A pledged monthly cadence of from-scratch models sharply accelerates the competitive cycle against Anthropic and OpenAI.

Details

• V9 foundation with 1.5 trillion parameters
• Supplemental training data from Cursor
• Private beta at SpaceX and Tesla
• Monthly from-scratch model cadence planned through 2026
• Musk benchmarks performance against Opus