Base Models Look Human To AI Detectors

In three linesCommercial AI detectors (GPTZero, Pangram) classify base model text as human-written, unlike instruction-tuned versions. Researchers propose HIP (Humanization by Iterative Paraphrasing), a pipeline that minimally fine-tunes a base model into an iterative paraphraser. Tested on Llama-3 and Qwen-3 (0.6B-70B), HIP improves human-likeness while preserving semantics.

Summary generated by Claude — human-verified