Open Weights
A model whose trained parameters are publicly downloadable, so anyone can run, study, or fine-tune it on their own hardware — unlike closed models accessible only through an API. Stable Diffusion and FLUX are famous open-weights image models; the entire LoRA and ControlNet ecosystem exists because their weights are open. For creators, open weights mean freedom (custom styles, local privacy, full control) at the cost of convenience — you manage the GPUs and setup yourself. Note: open weights is not the same as open source; training data and code often stay private.