PTX in this material In the captured material, PTX appears in the context of GPU assembly — the low-level work of writing code that runs directly on graphics hardware. Exploring how real-time video-to-video AI works, the conversation explains that building this kind of system took GPU assembly and a new model architecture, not just standard model training on top of existing frameworks. That framing is what a newcomer needs to connect the term to the discussion: PTX sits in the layer of expertise closest to the GPU itself, one of the reasons this kind of real-time system was hard to build before.