AI detectors can identify text paraphrased with QuillBot as AI-generated.

Is it true that AI detectors can identify text paraphrased with QuillBot as AI-generated?

Partly. Evidence is mixed and only partial: one study found QuillBot-paraphrased text was still flagged as AI-generated in most iterations, while other work shows some detectors can catch paraphrased text and one study reports detectors failed on software-humanized essays. No item settles the claim specifically for QuillBot across detectors generally.

Verdict: CONTESTED PARTIAL · 3 sources for, 2 against · Last checked 3 Oct 2026

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Shirpurkar, M. (2026). Robust Detection of Paraphrased AI-Generated Text Using Deep Recurrent Neural Networks. doi.org. https://doi.org/10.22214/ijraset.2026.77702

Epaphras, S. N. & Mtenzi, F. (2026). Evaluating the Effectiveness of AI Text Humanising Tools in Reducing AI Detection in AI-Generated Texts by AI Detectors. doi.org. https://doi.org/10.37284/ijar.9.1.4683

How Sensitive Are the Free AI-detector Tools in Detecting AI-generated Texts? A Comparison of Popular AI-detector Tools. (n.d.). cir.nii.ac.jp. https://doi.org/10.1177/02537176241247934

H, H. & CJ, Y. (2024). Investigating generative AI models and detection techniques: impacts of tokenization and dataset size on identification of AI-generated text.. doi.org. https://doi.org/10.3389/frai.2024.1469197

Lesnov, R. (2026). In 2026, Can AI "Humanizers" Outsmart AI Text Detectors?. doi.org. https://doi.org/10.2139/ssrn.7128878