According to Alan Segal, who literally wrote the book on “the two powers”, Philo (as well as other Jews in that period) conceived of the second power, or Logos as a creature outside of God’s being that God created in order to carry out his intentions.
Philo uses the stoic word logos in place of the Platonic word nous to mean the mind of God, in which all the ideas or forms of our world are conceived … So the logos, defined as the thinking faculty of God, can easily be described also as an incorporeal being, created for the purpose of carrying out His thoughts, having existence outside of God as well as containing the forms of the whole world. Alan Segal, Two Powers in Heaven (2002 [1977]), page 165.