Most AI tools give you a chat window.

Sai gives you a coworker with its own desktop.

I told it： "Do deep research on the topic."

Then I closed my laptop.

While I was off doing other work， Sai was inside its own secure Workspace - opening tabs， clicking through apps， reading sources， cross-referencing， taking notes. Not a chatbot summarizing a Google search. An actual coworker digging like a human does.

When I came back， the research was done. Sources cited. Approvals requested before it sent anything. Nothing risky executed without my green light.

This is what an "always-on" computer-using agent actually looks like.