Many large language models (LLMs) are described as open source, but
if one looks a bit deeper it turns out that is not actually so; the
model may be free to download, it may be "open weight", but it
does not fit the Open Source
Initiative (OSI) Open Source
Definition (OSD). Assessing the actual openness of models is not
easy, as Arnaud˙Le˙Hors explained in his talk about the Model Openness Tool (MOT) at Open
Source Summit North America 2026. The tool is designed to help
users of LLMs understand to what degree a model is (or is not) open,
and to combat the openwashing
that is prevalent with LLMs.
https://lwn.net/Articles/1073420/
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