How it works. According to DeepMind, SynthID can tag text, music, images, and videos generated by AI. For example, when an AI generates text, it does so by using tokens. Each token can represent a single letter, a word, and part of a sentence. The model predicts the next token based on the preceding context by assigning scores to each token. It ultimately generates recognizable patterns of scores that can be compared to any text, helping to determine whether it was generated by AI.