Two of the world's most powerful tech billionaires are locked in a legal battle over OpenAI - the company behind ChatGPT and a leading force in artificial intelligence. Elon Musk is suing the firm and its boss, Sam Altman - with whom he founded OpenAI in 2015 - alleging that they misled him by shifting the organisation away from its non-profit roots towards a for-profit model. OpenAI says Mr Musk is motivated by jealousy and regret for walking away from the company in 2018. It has also accused