Climate model developers and those who use these models benefit from sharing information with each other. Both groups require access to the best available data and rely on open source software tools designed to facilitate the analysis of climate data. Developers benefit the most from comparisons of their models with observations and other models when the results of such analysis can be made quickly available. A new climate model evaluation package will deliver objective comparisons between models and observations for research and model development and provide a framework for community engagement. It quantifies differences between observations and simulations contributed to the World Climate Research Programme’s Coupled Model Intercomparison Project (CMIP). This package is designed to make an increasingly diverse suite of summary statistics more accessible to modelers and researchers.