Definition
Plain language
A small AI system built on purpose so researchers can study a behavior they want to understand.
As stated in the literature
By analogy with fruit flies, a deliberately constructed model exhibiting a target behavior in a controlled setting, used to study a phenomenon experimentally.
Also called: model organisms
Why it matters: Controlled, deliberately-induced behaviors let researchers do mechanistic experiments that would be infeasible on a frontier model in the wild.
For example, researchers might fine-tune a small model to deliberately exhibit sycophancy so they can study how that circuit forms.
Heard on the show
“The monitoring case gets stronger with the model organisms — models deliberately trained to be misaligned, so there's a known answer.”Episode 203 — The Thought a Model Doesn't Say — and the Lens That Reads It