AI detectors have difficulty interpreting short pieces of writing because they rely on larger samples of text to assess whether something was written by AI or a human. Indicators such as low perplexity and uniform sentence structure become more meaningful when analyzing longer passages. In a 50-word text, there is simply not enough information to draw reliable conclusions.
Most detectors recommend submitting at least 250–300 words to obtain meaningful results. If the text is shorter than that, the score should be interpreted with caution because there is a higher chance that human-written text will be classified as AI-generated, or vice versa. If you need to check a short passage, consider expanding it or analyzing it alongside additional text.
Our post on How to Tell If Something Was Written by AI explains what AI detectors actually look for. Quetext's AI Detector displays a confidence indicator alongside the score.