Elon Musk is once again suing OpenAI and its chief executive, Sam Altman, resurrecting a legal battle against his former partners with a case that now claims they manipulated him into co-founding the artificial intelligence company. Months after abruptly withdrawing a similar lawsuit without explanation, Musk filed a new lawsuit on Monday in a northern California federal court. OpenAI denied the allegations in a statement to the Guardian, pointing to its previous blogposts about Musk's initial lawsuit earlier this year. Musk's latest complaint claims the case is a "textbook tale of altruism versus greed", repeating allegations in his previous suit that his former co-founders in OpenAI betrayed him by turning the company from a non-profit into a largely for-profit enterprise. "The perfidy and deceit is of Shakespearean proportions," it states.