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That is correct. It is possible they didn't opt out and given the timeline and anonymization of data unclear whether a particular conversation would have made it into the training set if they hadn't.

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Easy to ask for the account used to see if its usage went into training data. Also easy to say "Knowledge cut-off of the used model was date X".

That they don't is telling.

Maybe they didn't ask or the anthropic people said no? Plenty of other explanations here.

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