Elon Musk announced Grok 4.5's private beta, asserting its performance rivals or surpasses Anthropic's Opus, with ongoing reinforcement learning enhancements.
Grok 4.5 is currently being tested at SpaceX
Jun 29, 2026
01:48 pm
What's the storyElon Musk has announced that his artificial intelligence (AI) company, xAI, has entered the private beta phase for its latest model, Grok 4.5.
The testing is being conducted at SpaceX and Tesla facilities.
Musk said reinforcement learning is continuing to improve the model and that "Grok Build," xAI's coding-agent harness, is being…
xAI launches Grok 4.5 in private beta with SpaceX and Tesla, powered by a 1.5 trillion parameter V9 model that rivals Anthropic's…
xAI's Grok 4.5, a 1.5 trillion parameter model built on V9 with Cursor data, enters private beta at SpaceX and Tesla with…
“It might discover new physics next year… Let that sink in.”
Musk did not apologize nor did he accept responsibility for Grok's antisemitic, sexually offensive, and conspiratorial remarks.
The US start-up open sources the Grok 2.5 model and says it will do the same with Grok 3 within the next six months.
Elon Musk says Grok 4.5 is now in private beta, claims performance near or above Anthropic's Opus - The Economic Times
xAI unveils Grok 4.5, a significant upgrade powered by 1.5 trillion parameter V9 model
Grok 4.5 enters private beta at SpaceX and Tesla with 1.5 trillion parameters
Elon Musk says SpaceX is putting top Starship and Starlink engineers to work on Grok
xAI expands video and image generation tools under SpaceX umbrella
