Hugging Face open-r1: what 'fully open' actually means for a reasoning model reproduction

Hugging Face open-r1 is a community reproduction of a frontier-class reasoning model that ships three things together — model weights, training data, and training code. 'Fully open' here is the meaningful distinction: most open-weight releases ship weights only, which forces reproducibility-curious teams to reconstruct the training recipe themselves. open-r1 ships the recipe too, which means any team can rerun the training pipeline end-to-end on a different dataset, modify a single component, and verify the change actually moves the model.