I think what's going on is that the
pip3 you are using is a Homebrew version and not your Anaconda version.
Robins-MacBook-Air:~ robincole$ pip3 install clarifai --upgrade
Requirement already up-to-date: clarifai in /usr/local/lib/python3.6/site-packages
You can see
/usr/local/ in the path there while your
conda list shows your home directory.
Robins-MacBook-Air:~ robincole$ conda list
# packages in environment at /Users/robincole/anaconda3:
Can you try
python3 and then run
which python3 refers to the one in