Google is quietly loading Nano Banana 2.1 into Flow: leaked build, renamed down from '2.5 Flash'
A Google Flow menu entry read Nano Banana 2.5 Flash on Sep 24 and Nano Banana 2.1 three days later. Both sightings are screenshots from one leak account, and Google has confirmed no name, date or specs.
A model called Nano Banana 2.1 is waiting in Google Flow's character menu, and a week ago it carried a bigger number. On Sep 24 the leak-tracking account TestingCatalog posted Flow's New character screen with a fourth entry under Nano Banana Pro, 2 and 2 Lite, labeled Nano Banana 2.5 Flash. By Sep 27 the same slot read Nano Banana 2.1 and had moved up the list to sit under Nano Banana 2.
Google has said nothing about either name, with no blog post, model card, price or date, and TestingCatalog marked the entry as not available both times. Every post we traced relays those two screenshots, so treat this as one source seen many times. Our reading, and it is only a guess from a menu, is that 2.1 is a Flash-tier sibling of Nano Banana 2 rather than a new Pro, but a smaller number says nothing yet about the model itself.
In practice, the image model in that menu draws the start frame and character sheet for every Veo shot you build in Flow, so a new default can change how your characters look without asking. Save the reference sheets, prompts and seed images you rely on now, and note which model drew each one, so you can run the same character through 2.1 on the day it appears.
Source: TestingCatalog on X, Sep 24 and 27, 2026; Google product pages, read Oct 5, 2026.






