An AI operating system is how a piece of work runs once AI is part of it: the steps a model carries, the steps people keep, the gates between them, and the data both draw on. It exists at the scale of one workflow, a unit, or the enterprise. Five layers keep it running after we leave: someone decides what it is allowed to attempt, someone funds it, it has the data and context it needs, changes to it reach production, and a number says whether it paid. It is a running thing, not a document, and it installs into the way your organization already works.
Decide.
What it is allowed to attempt, at what level of risk, and who can stop it.
Fund.
What pays for it to run and to change, and under whose authority.
Data and context.
What it can see while it works: transactional data, definitions, policies, prior decisions.
Deliver.
How a change to it moves from idea into production, whoever builds it.
Account.
The number it moves, who owns that number, and how often it is defended.