Encyclopedia Britannica and its Merriam-Webster subsidiary have sued OpenAI in Manhattan federal court for allegedly misusing their reference materials to train its ‌artificial intelligence models.

Britannica said in the complaint filed on Friday that Microsoft-backed OpenAI used its online articles and encyclopedia and dictionary entries to teach its flagship chatbot ChatGPT to respond to human prompts and “cannibalized” Britannica’s web traffic with AI-generated summaries of its content.