Wait, are open weights effectively open source?

It annoys me when people call open weight models open source. You get a directory of safetensors files and a license, with no training data, no data pipeline, no training code, and no hyperparameters, so you can’t rebuild the model from what was published. The G7 recently proposed a four-tier openness spectrum, and Stephen O’Grady checked 40 open models against it and found that zero of them qualify as open source AI.