Pigment, a planning software company, offers a free 14-day trial in which you describe the budget you want to an AI agent. It asks a few questions and builds a working model within minutes, and you can load your own figures and compare scenarios.
The slow part of a budget has been its structure: which lines exist, how headcount drives payroll, how volume drives fuel. When finance needs weeks to build that, a department head gets to ask two or three what-if questions a year. When it takes minutes, nobody needs to ration the questions.
The weak point moves into the assumptions. To build that fast, the agent fills every gap with something reasonable, such as a pay rise in January or customers paying in 30 days, and a model with a number on every line does not show which ones were guessed.
So test it on a year that has already happened. For example, a logistics manager could describe last year as it looked in January, with the volumes, drivers and fuel price she expected then. If the model spreads overtime evenly and her real December cost twice a normal month, she has found the assumption that would have broken next year's budget.
Budget rounds will soon bring thirty versions instead of three, and the argument will move from the totals to the assumptions underneath. The depot manager who knows why December is different becomes the most useful person in the room.