Lumos Web

Open a folder from your device and work on it with Claude. The files stay in your browser; only what the assistant reads is sent to the model.

Choose a folder

This browser can read folders but not write to them. Chrome, Edge and other Chromium browsers can also let Lumos edit files.

On-device files

The folder is opened with your browser's File System Access API. No upload, no server copy.

You approve changes

Reads are automatic. Edits, new files, moves and deletes show a diff and wait for you, unless you turn on auto mode.

Pick your model

Fable 5.1, Opus 5.5, Sonnet 5.5 or Haiku 5.5, with an effort slider and visible thinking.