Why did Philo Judaeus sometimes call Logos the first-begotten Son of God?

Philo Judaeus, a 1st-century Jewish philosopher from Alexandria, utilized the concept of the Logos primarily as an intermediary between a transcendent, unknowable God and the created world.12

In his philosophical framework, Philo described the Logos as the agent of creation and the divine mind through which the human intellect can comprehend God. By referring to the Logos as the "first-begotten Son of God," the "image of God," and "second to God," Philo was employing philosophical terminology to express his religious belief in the Logos as the mediator of the cosmos. This conceptualization served to bridge the gap between the absolute transcendence of God and the material universe, positioning the Logos as the "Idea of Ideas" and the place of the intelligible world.13

While these descriptions anticipated later Christian doctrines regarding the preexistence of Jesus Christ, Philo’s use of such language was rooted in his attempt to synthesize Judaism with Greek philosophical concepts, specifically those of Platonism and Stoicism.423