01Separate the four interfaces first
Web is easiest for chat, search and a few chosen attachments. Desktop apps sit closer to files, voice, screenshots and operating-system integration. CLI runs in a terminal and fits code or batches in the current directory. API embeds the model in your own program and workflow. They can call the same model while having different context, tools and permissions.
02A terminal is a text control panel
Terminal, Windows Terminal and a Linux shell execute commands in a current directory. CLI means Command-Line Interface: text parameters define a task and results print or write files. It is precise, reproducible and composable, but deletion, overwrite, sending and permission change can happen directly. Check the current directory, preview targets, then act. `pwd` asks where you are; `ls` lists content; `command --help` explains options. Never paste passwords, keys or identity material into public commands, screenshots or logs.
03Use desktop for choosing and CLI for repetition
For three PDFs once, a desktop app is often clearer. For dozens of files in one directory every day, CLI forms a repeatable process. A practical combination is desktop inspection and confirmation, terminal batch work, then reopening the output for acceptance. Do not move to CLI merely because it looks professional; choose web for conversation and attachments, apps for frequent desktop work, then terminal for files and code automation.
04Every capability adds a permission boundary
A web chat sees uploaded files, a CLI may see the current directory, desktop automation may control mouse and keyboard, and an API key can represent account budget. Know the scope before authorization and inspect the actual result afterward. An AI claim of completion does not prove an external system changed.
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