← Chen, Ho Yiing — Research Records

Mercury: An Addressable Million-Cell Sensor Grid for Browser-Accessible LLM Observability on Consumer Hardware

Chen, Ho Yiing · 2026-05-20 · Zenodo

doi:10.5281/zenodo.20313154 · PDF

Abstract

v2 corrigendum (2026-05-21): Bibliography polished to canonical forms — Bycroft (December 2023) year corrected, full author lists added for Bricken et al. (24 authors) and Carter et al. (5 authors), DOIs added for Vig (10.18653/v1/P19-3007) and Activation Atlas (10.23915/distill.00015). No changes to method, results, or claims. I present Mercury , an open-source observability layer for transformer language models that places up to one million addressable sensor cells across a model's hidden state space, captures activation patterns through a standard logits-processor hook, and produces a

Chen, Ho Yiing (norika) · Independent Researcher, Taiwan · ORCID 0009-0006-6816-9891