This depends on many drivers and combination of different external tools. Small example is busybox - it's still small, but getting bugfixes/features and new ap

This depends on many drivers and combination of different external tools. Small example is busybox - it's still small, but getting bugfixes/features and new applets. OpenWrt already abandon devices 4/32: https://openwrt.org/supported_devices/openwrt_on_432_devices https://openwrt.org/supported_devices/openwrt_on_432_devices and probably next abandoned will be 8/64 within two or three years.