Grok 4.5, a 1.5-trillion-parameter model built on the V9 foundation, entered private beta at SpaceX and Tesla on June 28, 2026, per Elon Musk’s X post. Early internal evaluations suggest performance close to or potentially exceeding Anthropic’s Opus, though no independent benchmarks exist.
The model incorporates Cursor coding data in supplemental training. xAI anticipates releasing new models trained from scratch every month through end of 2026. Deploying inside SpaceX and Tesla before public access reflects confidence in engineering-intensive use cases spanning hardware, software systems, and real-time decision-making.