Elon Musk’s artificial intelligence startup xAI is burning through $1 billion a month as the cost of building its advanced AI models races ahead of the limited revenues, according to people briefed on the company’s financials.

Elon Musk has promised that his AI business, xAI, will help to revolutionize society. Before it can do that, however, the company is going to need to become fiscally viable—a goal it hasn’t quite met yet.

Elon Musk’s artificial intelligence startup xAI is burning through $1 billion a month, according to a Bloomberg report. The cost of building its advanced AI models has been racing ahead of its limited revenue, indicating the unprecedented financial demands of the AI industry, particularly xAI whose revenues have been slow to materialize.