open weights
nounEtymology After open source.
1
Freely available final weights and biases of a trained neural network.
Machine learning
- The vast majority of LLMs that claim to be fully open source are actually just open weights and sometimes not even that.2025, Alessandro Benedetti, How Large Language Models Can Help Your Search Project, Springer Nature, →ISBN, page 28:
- OpenAI just dropped two new open-weights models. Here's why that isn't the same as being fully open. […] Basically, open-weights is a category of AI models that power products like chatbots, image and video generators.[…] Open-weights models give us a peek at the mechanical wizard behind the curtain, so to speak.2025 August 5, Katelyn Chedraoui, “OpenAI's New Models Aren't Really Open: What to Know About Open-Weights AI”, in CNET, archived from the original on 30 Aug 2025: