This dataset forms the basis of the sea-level commitment analysis of Nauels et al. (2025). To process the data and reproduce the figures of the study, please clone the corresponding GitLab repository (https://gitlab.com/anauels/slr_commitment) and follow the instructions in its README file. This dataset should then be stored in the data/ directory of the local copy of the repository, while maintaining the directory structure. Under the MAGICC/ subdirectory, the scenario forcing input to MAGICC, as well as the MAGICC model output for the RCPs and SSP-RCP-based commitment scenarios, is provided. Under the P20/ subdirectory, the P20 comparison global mean sea-level rise (GMSLR) output is provided, as well as the input for and output of the regionalization.