open weights

open weights

English

Etymology

After open source.

Noun

open weights (uncountable)

  1. (machine learning) Freely available final weights and biases of a trained neural network.
    Antonym: closed weights
    • 2025, Alessandro Benedetti, How Large Language Models Can Help Your Search Project, Springer Nature, →ISBN, page 28:
      The vast majority of LLMs that claim to be fully open source are actually just open weights and sometimes not even that.
    • 2025 August 5, Katelyn Chedraoui, “OpenAI's New Models Aren't Really Open: What to Know About Open-Weights AI”, in CNET‎[1], archived from the original on 30 August 2025:
      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.
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