Test datasets for the AuTexTification shared task at IberLEF 2023. This task aims to boost research on the detection of text generated automatically by text generation models. Participants must develop models that exploit clues about linguistic form and meaning to distinguish automatically generated text from human text. It consists of two tasks, both for English and Spanish: 1) Generated or Human: determine whether the text has been automatically generated or not. 2) Model Attribution: determine what language model generated a text.