This paper highlights that while artificial intelligence (AI)-based weather models have achieved operational-level performance for certain variables, they still suffer from systematic biases and reliability issues, similar to those of conventional numerical weather prediction (NWP) models. We apply IMPROVER, the Australian Bureau of Meteorology's statistical postprocessing system, to ECMWF's Deterministic AI Forecast System (AIFS) and compare the postprocessed results with those from the ECMWF HRES and ENS models. Without modifying the workflow, postprocessing yields similar accuracy improvements for AIFS compared to conventional NWP forecasts, demonstrating both forecast accuracy and probabilistic output. Furthermore, we demonstrate that blending AIFS with NWP models improves overall forecast accuracy, even when AIFS alone is not the most accurate.