Elon Musk, the world’s richest person, is asking OpenAI and Microsoft to pay him US$134 billion (A$201 billion) in wrongful gains from his investments in OpenAI. The Tesla and SpaceX Chief Executive Officer, whose net worth has been estimated at $750 billion, is making the claim in legal action he has launched against the two companies in a United States court. In a court filing Musk cited a financial expert’s estimates of OpenAI’s and Microsoft’s gains from his “critical contributions” to OpenAI from the time he helped found the artificial intelligence (AI)-focussed research and technology company. The contributions included the $38 million, or about 60% of the non-profit’s seed funding, in its early years, and non-monetary contributions such as recruitment, introducing contacts and teaching his co-founders about running a business. The early contributions were critical to OpenAI’s ability to achieve the $500 billion valuation it reached over the last year, he claimed. The expert calculated OpenAI’s gains as the product of the value of OpenAI’s for-profit entity, OpenAI non-profit’s share of the for-profit and the portion of the non-profit’s value attributable to Musk’s contributions, which he estimated at 50% to 7