Claude Projects isolation appears broken: model recalls content from other projects

MaterialDurian2836 · reddit · 2026-09-12

A Reddit user reports that inside one Claude Project, the model repeatedly referenced content that existed only in other Projects — including project-specific terms — and even named those projects when asked, despite the user never attaching that information to the current chat.

The user valued the per-project memory isolation and wants to know whether this is a new feature or a bug, and how to revert. There is no official response yet. If confirmed, this is a notable privacy concern for anyone using Projects to keep client or sensitive material compartmentalized.

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