Is Undisclosed LLM Use Morally Wrong?

Much Large Language Model (LLM) use is happening undisclosed. This is troubling because the undisclosed use of LLMs to mediate interpersonal communication can be a morally objectionable kind of deception. It is morally objectionable when the intentional failure to disclose LLM use deprives others of valuable information they need for their epistemic appraisal of, inter alia, another’s authentic competencies. In this paper, we provide an analysis of deception in the context of undisclosed LLM use and argue that in some cases this amounts to an ethically salient epistemic wrongdoing.