While there is no official software version called "V-Ray Next 5x," it is highly likely you are referring to the marketing surrounding V-Ray Next (which introduced massive speed boosts) and V-Ray 5 (the subsequent major release).
Here is a helpful article breaking down the "5x" performance claims, the features of V-Ray Next/5, and how it integrates into your specific workflows. vray next 5x for 3ds max maya revit other 2 hot
Whether you are an Architect using Revit or a generalist using Maya, the "V-Ray Next" and "V-Ray 5" updates changed the game differently for each platform. While there is no official software version called
Older V-Ray versions had Interactive Production Rendering (IPR), but it was jittery. V-Ray Next 5.x introduced a GPU-accelerated, progressive IPR that updates in real-time. Hot workflows in Maya:
This feature alone cut look-dev time by nearly 40% in internal tests.
Differentiators:
Limitation (5.x): No Vision real-time engine (added in V-Ray 6).
Use Case: Character lighting, creature FX, environment rendering for streaming series.