Example photo-z conditional densities on the DR6 test set at n_train = 121,626 for the three leading density estimators: TabPFN 2.5 (red, solid; foundation), FlexZBoost (gray, dashed; tree based), and Flow-Spline (blue, dotted; neural). The 3 × 3 grid cross-tabulates three r-magnitude bins (rows) against three z_spec bins (columns); within each cell, the displayed object is chosen uniformly at random (fixed seed). The thin black line and triangle mark the spectroscopic redshift; the object identifier is shown in the top right of each panel. The bottom row and right column show faint and high-redshift cases, respectively.