Classical models, in which rational expectations play a dominant role in determining the  4/5  BIS - Central bankers' speeches  cost of disinflation, show low cost, while Keynesian models, in which slack in the economy is needed to reduce inflation, show high cost.
See, for example, Sargent (1982), Croushore (1992), Goodfriend and King (2005), and Tetlow (2022) for a comparison of the cost of disinflation across macroeconomic forecasting models. 3 See the definition for "track" at https://www.merriam-webster.com/dictionary/on%  20track.