Seeing the steps with corresponding images of how to access them really helps, i.e.
For example at https://chat.openai.com/ there is this
for me.
Now some may not know that plugins are active on this, if they knew they just have to click the drop down
then select Plugins to see
So if/when someone gets access to Code Interpreter and could post such steps with corresponding images it would be nice. 
In watching the demo it clearly is using a model
with ChatGPT.
AFAIK this is not via a plugin as I do not see any plugin active. e.g.
Same for Browsing
In the documentation it notes
Code run by our interpreter plugin
which is where I think the confusion originates.
Likewise there is this mention of a browsing plugin
We’ve created a web browsing plugin
So until I see steps with corresponding images I will just wait, maybe there is both a browsing model and browsing plugin.
EDIT
(ref)