OpenAI plans to invest roughly US$400 billion to develop five new US data centre sites in partnership with Oracle and SoftBank Group, marking the biggest push yet to fulfil an earlier pledge to spend a half-trillion dollars on artificial intelligence infrastructure in the country. The new locations, spread across Texas, New Mexico and Ohio, will eventually have a capacity of 7 gigawatts of power, or as much as some cities, the companies said Tuesday. The plans were announced by executives from...