xAI AI Updates: June 30, 2026

1. xAI Puts Grok 4.5 Into Private Beta at SpaceX and Tesla

xAI. Elon Musk announced on June 28 that Grok 4.5 has entered private beta, with access initially restricted to internal use at SpaceX and Tesla. The model is built on xAI’s V9 foundation, carries 1.5 trillion parameters (a 50 percent increase over the 1-trillion-parameter Grok 4.4 from late May), and incorporates supplemental training data from the Cursor code editor; early internal evaluations reportedly place its performance close to or potentially above Anthropic’s Opus, though no third party has access and xAI has not submitted it to any public benchmark. The disclosure accompanied a roadmap in which xAI says it plans to release new foundation models trained from scratch every month through the end of 2026. Source