Nano Banana 2.5 Flash spotted in Google Flow before any launch

Google's next image model may be close. References to Nano Banana 2.5 Flash were found in Google Flow, Google's AI filmmaking tool, on 24 Sep. Reports point to nano-banana-2.5-flash endpoint strings in Flow's backend. Google hasn't confirmed anything: there's no announcement, spec sheet or release date.

The name suggests a mid-cycle update rather than a new generation. The current lineup is Nano Banana 2, the higher-end Nano Banana 2 Pro, and Nano Banana 2 Lite, the budget model Google shipped on 30 June alongside Gemini Omni Flash for video. A "2.5 Flash" would likely sit in the middle: better quality than Lite, faster and cheaper than Pro.

Flow makes sense as the place for it to appear first. Google already built Nano Banana editing into Flow, so an image you've cut out or restyled can go straight into the timeline and become a video shot. A faster image model directly speeds up that loop. Treat this as a leak, not a launch. Models often show up in code weeks before they ship, and some never ship under that name.

Why it matters: Google keeps shipping image models quickly, which puts steady pressure on rivals' speed and price, and Flow is increasingly where Google tries its new models first.