Manus is a genuine autonomous agent. Give it a brief and it works in a cloud sandbox: research, slides, a website, a spreadsheet, a video, all from one prompt, with parallel sub-agents and a browser that can act inside your own logged-in tabs. For batch work with a clear finish line, that is impressive.
It is not a chat workspace. Manus offers its own branded models, so you cannot pick Claude for a draft or GPT for an outline by name. Everything is metered in credits: the $20 Standard plan carries 4,000 a month, and a single video on its premium model can cost 600 of them. There are no persistent multi-model threads, and its training stance is not stated in its policy.
Magai is the other side of the same coin. You choose the model, by name, from dozens, and change your mind mid-thread. Agents carry your instructions across every model, memory carries the facts, scheduled tasks run on any of them, and a month costs what the plan says.