The AI firm announced that testing will begin in the coming weeks Sign up to our free weekly IndyTech newsletter delivered straight to your inbox Sign up to our free IndyTech newsletter Sign up to our free IndyTech newsletter Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice OpenAI is poised to introduce advertisements for users of its free ChatGPT service, signalling a major shift in its approach to monetization. The