In an interview with Bloomberg, Altman says OpenAI is “not for sale” and the bid is the latest of “tactics, many, many lawsuits, all sorts of other crazy stuff, now this” for the “competitor” Musk to “slow us down.

A billionaire tech battle is heating up as the chief executive of OpenAI, Sam Altman, brushes off Elon Musk’s unsolicited bid to buy his artificial intelligence company and suggests that Mr. Musk lives his whole life “from a position of insecurity” and is probably not “a happy person.”

The billionaire is leading a group of investors in the unsolicited offer, which complicates the start-up’s plan to raise more money.