Overview
- xAI announced that Grok 4.5 entered private beta at SpaceX and Tesla, with Elon Musk posting the deployment on X on June 28, 2026.
- The model is built on the V9 foundation with 1.5 trillion parameters, a large jump from prior Grok variants to boost raw capacity.
- xAI supplemented Grok 4.5 training with Cursor code‑editor data and continues reinforcement learning and Grok Build tool improvements to sharpen coding and technical tasks.
- Internal evaluations reported by xAI say Grok 4.5 performs close to or may exceed Anthropic’s Claude Opus, but those claims have not been independently verified.
- xAI plans an accelerated monthly model training cadence through the end of 2026, yet it has not announced a public release date or wider access plan, leaving developers and customers uncertain about availability.