// definition
Open-weight model
AI model distributed with its learned parameters
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Short definition
An AI model whose weights, the parameters learned during training, are made available so that others can run or adapt it. Permitted uses depend on the licence. Open weights describe a distribution arrangement; they do not by themselves determine how capable the model is.
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Knowledge map
Primary sources
- OpenAI, The AI policy window is openDistinguishes frontier capabilities from open-weight distribution, including deployment on local infrastructure, September 9, 2026.