The online mortgage platform Better has partnered with OpenAI to launch an app within ChatGPT that the companies said will dramatically reduce the time it takes to underwrite a mortgage or home equity loan, CNBC has learned exclusively.The app, to be announced later Thursday, takes Better's mortgage engine and combines it with OpenAI's models to speed up the underwriting process for loan officers working at banks, mortgage brokers and fintech firms, Better CEO Vishal Garg said in an interview."Taking the mo ...