A group of US news outlets led by The New York Times has filed a motion asking a Manhattan federal judge to impose sanctions on OpenAI, accusing the artificial intelligence company of concealing evidence in an ongoing copyright infringement case. The newspapers allege OpenAI has withheld training datasets and ChatGPT conversation logs that could reveal how the system was built using millions of copyrighted news articles without authorisation, with a recent employee deposition said to contradict the company's earlier claims. The case, which also names Microsoft as a co-defendant, is seen as a potentially landmark test of how AI companies may use published journalism, at a time when AI-generated summaries are already cutting into the web traffic and advertising revenue on which news publishers depend.