Density, not size, is the comparison axis. Each game has its own density profile.

Cyberpunk 2077

Thin footprint, vertically dense. Night City covers less ground than GTA's cities but is tall. A different design philosophy from GTA.

RDR2

Spatially extensive, but not building-dense. Dense with wildlife and weather instead. A different kind of density from urban GTA.

Watch Dogs

Medium-density urban sprawl. Less interactivity than GTA, but more of a tech-coded gameplay layer.

GTA 6's place

Judging from trailers, urban density appears very high - likely the densest single open-world city released in 2025-2026. Relative to RDR2, less horizontal; relative to Cyberpunk, less vertical; relative to Watch Dogs, more interactive.