Tech Blogger Brian Potter Explains How Vision-Language-Action Models Drive Robot AI

The main driver of recent humanoid robot progress is not hardware but specialized AI models. Tech blogger Brian Potter, writing on Construction Physics, builds up the full explanation of Vision-Language-Action (VLA) models starting from matrix multiplication.

A VLA borrows the Transformer attention mechanism from large language models, but its input is text, images, and robot sensor data, while its output is a sequence of motor commands. Figure, Unitree, Physical Intelligence, and Nvidia all use this architecture. Potter uses the open-source pi0.5 as a worked example, tracing the path from multimodal context to complex task planning.

The value for readers is a concrete framework to distinguish genuine perception-decision-execution loops from teleoperation or scripted behavior. Whether VLAs remain the dominant paradigm is uncertain, but they are the most widely used control architecture today.

The article covers public technical documentation at the principle level. It does not address proprietary performance metrics of the latest closed-source models, nor does it imply every robotics company uses the same approach.