The Deep-time Model Intercomparison Project (DeepMIP-Eocene; https://www.deepmip.org/), is a large, international effort aimed at improving our understanding of climate during the early Eocene and PETM. In this splinter session, we will bring together the paleoclimate data and modelling communities to evaluate lessons learned from phase one of DeepMIP-Eocene (2016-2022) and explore future directions for phase two (2023-onwards).