Elon Musk announced that Grok 4.5 has entered private beta testing at SpaceX and Tesla. Built on xAI’s 1.5-trillion-parameter V9 foundation model and enhanced with Cursor AI coding data, the system reportedly rivals Claude Opus. Musk said reinforcement learning is steadily improving performance, with plans for frequent new AI model releases in rapid development cycles across his companies.

New Delhi: Elon Musk on Sunday announced that xAI's latest artificial intelligence model, Grok 4.5, has entered private beta testing at SpaceX and Tesla, marking the first confirmed deployment of the model within Musk's companies ahead of a wider release.

In a post on social media platform X, Musk said Grok 4.5 is based on xAI's 1.5-trillion-parameter V9 foundation model and has undergone supplemental training using data from AI coding assistant Cursor.

According to Musk, early evaluations indicate that the model's performance is close to, and may even exceed, Anthropic's Claude Opus.

"Grok 4.5, based on our 1.5T V9 foundation model, with Cursor data added in supplemental training, is now in private beta at SpaceX & Tesla. Early evals show performance close to, perhaps exceeding Opus," Musk wrote.