Seedream
Seedream is named on the same Image Generator card as Nano Banana Pro on /tool. Official line for that card: includes Nano Banana Pro, Seedream, and more models. I keep the spelling as they printed it.
I did not see Seedream on the Create Image default chip — that chip was GPT Image 2 — so I am not going to claim Seedream is the homepage default. It is a listed stills model in Tools.