Elon Musk is suing OpenAI and its chief executive Sam Altman for allegedly abandoning the company's original mission to develop artificial intelligence for the benefit of humanity not profit. The lawsuit alleges that Altman and Greg Brockman, co-founder of the artificial intelligence (AI) research organisation, originally approached Musk to make an open source, non-profit company. The focus of the company, which is behind ChatGPT and is backed by Microsoft, on making money breached that contract, Musk's lawyers said in the lawsuit filed in San Francisco. They added that the company kept the design of GPT-4, its most advanced AI model, 'a complete secret'. Musk co-founded OpenAI in 2015, but stepped down from its board in 2018.