OpenAI rebutted Elon Musk’s claims against it in a court filing, saying that the Tesla Inc. billionaire’s claims “rest on convoluted — often incoherent — factual premises.” The strongly worded response was lodged after Musk filed a lawsuit against OpenAI, Chief Executive Officer Sam Altman and President Greg Brockman. Musk alleged the startup had strayed from its mission to build responsible AI and that it had become beholden to Microsoft Corp., its largest investor. OpenAI also pushed back agai...