The SAMPL7 log P challenge consisted of predicting the water-octanol partition coefficients of 22 molecules. Our goal was to evaluate how well current models can capture the transfer free energy of small molecules between different solvent environments through blind predictions. challenge participants were asked to predict the difference in free energy for the neutral form of each molecule between water and octanol. For the log P challenge, participants were required to report, for each molecule, the SAMPL7 molecule ID tag (the challenge provided neutral microstate), the microstate ID or IDs that were considered, and the predicted transfer free energy, transfer free energy SEM, and model uncertainty.