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What exactly does "open" mean in this case? Is it weights and data or just weights?

It's always open weights.

It's never open data

Well, it is, it's your data to begin with after all but admitting that would create some problems.

This model is sort of interesting since it seems to be using a lot of synthetic training data – but your point stands

So it's a rip off of a rip off, is that whats interesting?

unless you're Ai2