OpenAI's Automated Interpretability from paper "Language models can explain neurons in language models". Modified by Johnny Lin to add new models/context windows.
The neuron responds to expository passages packed with quantitative details—numbers, measurements, dates, statistics, and other technical or factual specifications.
o4-mini
pumps may be manual devices powered by hand or foot movements
The neuron responds to numeric tokens—especially the position-numbers in chemical names (e.g. “2,” “3,” “4,” “2,6,” etc.)—i.e. digits indicating substituent positions in compound nomenclature.