arxivcs.SEcs.LG2026-07-01
The Moving Target: A Longitudinal Audit of Trustworthiness Drift Across Twelve Checkpoints of Open-Source Chat LLMs
Zhichao Fan, Yanhang Li, Zexin Zhuang, Xian Sun, Yingshuo Wang
Model cards quote trust-benchmark scores without recording when they were measured, and the same number is routinely carried across successive checkpoints of one release line as if the model behind it had not shifted. We test whether it has shifted by auditing four open-source re…