According to the Testing Catalogue website, Nano Banana 2 became available on the Media AI platform in preview.

Outputs of the previewed model, labelled as Nano Banana 2, matched the results we've got from confirmed Nano Banana 2 when it was available on Gemini for a short period of time, the website mentioned.

Internal observation suggested that Nano Banana 2 is still leveraging Gemini 2.5 Flash.

"This choice may indicate an earlier release window, with the possibility of a subsequent upgrade to the newer base model once it becomes available," the website mentioned.

The model is reportedly exhibiting a multi-step generation workflow.

Feature updates also point to expanded aspect ratio support (including 1:1, 2:3, 3:2, 3:4, 4:3, 9:16, 16:9, and 21:9) and a broader range of output resolutions, with 1K, 2K, and 4K modes listed in code references, the website mentioned.