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A slightly sharper model is an ephemeral advantage; the enduring prize is the living record of a person's unfinished tasks, verified authorizations, and accumulated life patterns. As companies race to run our errands, whoever manages our daily context will command our highest switching costs.

The fashionable consumer-AI product begins with an empty chat box. Baidu’s new Personal Super Intelligence group starts somewhere less glamorous and potentially more useful: the documents and folders people already have.