OpenAI has hired a law firm that Elon Musk previously sued for $90 million to defend it against Musk's recent lawsuit claiming the Microsoft-backed artificial intelligence company abandoned its nonprofit mission to ensure that AI benefits humanity. Lawyers at Wachtell, Lipton, Rosen & Katz and another team from Morrison & Foerster will represent OpenAI, its CEO Sam Altman and others on the lawsuit, according to a filing made public on Monday in San Francisco Superior Court. The attorneys in another filing, opens new tab said Musk's claims in the lawsuit "rest on convoluted — often incoherent — factual premises."Musk sued OpenAI on Feb. 29, claiming the company, now the face of generative AI, breached its obligations to develop technology “for the benefit of humanity, not to personally benefit the individual Defendants and the largest technology company in the world.” Musk’s AI startup xAI launched in July. Musk sued New York-based Wachtell in the same San Francisco court last year, challenging $90 million in legal fees the law firm earned as counsel to Twitter in its successful effort to force Musk to consummate his $44 billion deal to buy the social media platform. A judge sent the fees case to private arbitration at the law firm’s request in October. Musk’s attorney in the OpenAI case, Morgan Chu of Irell & Manella, and lawyers for OpenAI and Altman did not immediately respond to requests for comment.