How did Porphyry’s version of Neoplatonism differ from Plotinus’s teachings?

Porphyry’s version of Neoplatonism diverged from the teachings of his master, Plotinus, in several key areas, reflecting a shift toward more complex metaphysical structures and a more intense focus on spiritual practice.1

• Metaphysical Structure: While Plotinus maintained a vertical hierarchy of reality, Porphyry introduced the beginnings of a late Neoplatonic tendency to organize reality into both vertical and "horizontal" triads. He notably proposed that Being, Life, and Intellect are phases in the eternal self-determination of ultimate reality, a concept that became central to later Neoplatonists.1
• Distinction of Principles: Porphyry did not always clearly distinguish the One from Intellect, whereas Plotinus insisted that the One, or Good, is a transcendent principle beyond the reach of thought or language.21
• Spiritual Emphasis: Porphyry exhibited an even sharper insistence than Plotinus on the "flight from the body," reflecting an extreme spiritualism. Additionally, he showed greater sympathy for the less sharply defined vertical hierarchies found in earlier Platonist traditions.1
• Integration of Logic: A significant contribution of Porphyry was the formal incorporation of Aristotle’s logic—specifically the doctrine of categories—into the Neoplatonic framework, interpreting them as terms signifying entities.1

While Porphyry remained a devout disciple who meticulously edited the Enneads, his work laid the groundwork for the more elaborate, systematized, and sometimes ritualistic Neoplatonism that followed.21