How do I open a new Terminal window ssh'ed to another machine from the command line?

There is a way to do this with

osascript -e 'tell application "Terminal" to do script "exec ssh localhost"'

Replace 'localhost' with the host name to which you wish to connect. You can include a username if the remote name is different from your local username, this would look like

[email protected]
\____/\_____/\______________/
 |     |      `- Domain name, you may be able to omit if on the same network as 'remotey'
 |     `- Remote hostname
 `- Specify remote login name followed by '@', can be omitted for same username

This suggestion is a variation on the top answer at https://stackoverflow.com/questions/31524499/open-terminal-from-shell-and-execute-commands

Use exec ssh instead of ssh if you want the window to close after logging out. If you use the 'exec ssh' option and your window stays open, then check your Terminal preferences--under "Profiles" > "Shell" > "When the shell exits:" is probably set to "Don't close the window"

As far as I know, you can't do it using open command.

But, you can do it using a combination of keyboard shortcuts and Terminal profiles.

Define a new profile on your Terminal app (let's call it ssh) and add your ssh command on Shell tab under Run command:.

Then your can define a shortcut on System Preferences - Keyboard - Shorcuts - App Shortcuts like the following:

Once done, you will have to type the shortcut on your Terminal app and will open a new window with your ssh command.

Careful, the Menu Title must have the exact same name as your newly created profile.