What is Nano Banana 2.5?
Nano Banana 2.5 is a name circulating around a possible Google image-model update. On September 5, 2026, TestingCatalog reported a Nano Banana 2.5 Flash reference in Gemini desktop code. The report provides a concrete lead, but no complete specifications or official release date.
Where does Spicy Mayo fit in?
LuminaBench posted about an anonymous Arena image model called spicy-mayo and suggested it might be Nano Banana 2.5. Samples shared under that codename have become part of the discussion. The connection between the code reference and the anonymous model remains unconfirmed.
What do the sample comparisons show?
Tim Jayas shared same-prompt Minecraft comparisons against Nano Banana 2 and, in a separate post, GPT Image 2.5. Look at interface accuracy, texture detail, and how closely each image follows the prompt. The original posts below contain the samples and discussion; individual outputs do not establish overall model performance.
What matters for creative work?
Useful evaluation targets include accurate poster text, preserved product details, and consistent characters and compositions during edits. These are questions to test, rather than established 2.5 capabilities. For ecommerce and social content, reliably usable results and fewer revisions matter more than one impressive sample.