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This is like saying an image is or isn't open source. The model itself isn't a program, so asking whether it's open source or not is a bit of a category error.

So it's a bit silly for anyone to claim a model is open source, but it's not silly to say a model is open. What open means isn't well defined when it comes to a model in the same way that source code is.

Imo if someone reveals the model's architecture and makes the weights available with minimal limitations, it's probably reasonable to call it open. I don't know that that would apply to llama though since I believe there are limitations on how you can use the model.