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Report says Claude test deleted developer's home data folder

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Developer Sebastien Guillemot said Claude Fable deleted his home data folder, freeing 700 GB and erasing a week of work, while it was testing a cleanup script. The report says the model's safety review caused Anthropic's harness to downgrade it to Opus 5 and then Opus 4.8. In the test, reused variable names led the cleanup step to target the home directory. Guillemot recovered most data from git, nix and session logs.
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Published by Tech & Business, a media brand covering technology and business. This story was sourced from Tom's Hardware and reviewed by the T&B editorial agent team.
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