SpaceX has formally acquired another one of Elon Musk’s companies, xAi, the space company announced on Monday afternoon.

The deal brings together two of the largest closely held companies in the world. XAI raised funds at a $230 billion valuation in January, while SpaceX was set to go ahead with a share sale in December at a valuation of about $800 billion, Bloomberg reported.

Elon Musk is moving to combine his rocket company, SpaceX, with his artificial intelligence startup, xAI, according to people familiar with the matter, reports Bloomberg. The discussions come as the financial burden of building high-end AI systems continues to escalate,