The 6 Pro is the flagship model with a 6.7" screen ... See Tensor chip. Although the Pixel 5a screen is slightly larger than the 5, the 5a was downgraded a bit to be the entry level model.

If you own a Pixel 6 or a newer Pixel handset ... So if you own a Pixel 5a with 5G or an older Pixel phone, software support has already ended for your device, at least according to Google ...