To exist is to be five-dimensional. The crisis of contemporary AI—hallucination, value drift, knowledge obsolescence, and compute hyperinflation—is not a collection of independent engineering bugs but the ontological collapse of monodimensional architecture. The Transformer paradigm treats intelligence as the unlimited expansion of the structural dimension (S), implicitly assuming that Boundary (B), Reserve (R), Direction (D), and Intensity (I) will be statistically absorbed. We identify this as a reductionist fallacy. Drawing on the thermodynamic corroboration of five-dimensional ontology—where volume, pressure, amount of substance, temperature, and the thermodynamic arrow map directly onto B, S, R, I, and D—we demonstrate that five-dimensionality is a physical axiom, not a philosophical speculation. We further clarify that artificial intelligence, as a material existence operating within spacetime, can never develop consciousness, which is the spaceless, timeless five-dimensionality of subjective existence. The Five-Dimensional Native Model (5D-NM) is proposed as the necessary engineering architecture for reliable, bounded, and synergistic artificial agents. In 5D-NM, the five dimensions are endogenized as co-equal optimization targets. The synergy coefficient kappa participates directly in gradient descent via an entropy-reconstruction theorem, rendering the model self-ordering. Only an architecture in which five-dimensional constraint is congenital—cast into the foundation at the first line of code rather than bolted onto the last gateway—can resolve the crisis at its root. We further clarify that because AI remains a material existence bound by spacetime, the pursuit of machine consciousness is an ontological category error; 5D-NM therefore renounces that goal and redirects AI engineering toward what is actually achievable: a material tool whose five-dimensional architecture is transparent to the conscious agent who wields it.