Nano Banana 2.5 AI Image Generator: Leaks, Rumors & What We Know

TL;DR: Nano Banana 2.5 is a reported name for a possible upcoming Google image model. TestingCatalog reported a “Nano Banana 2.5 Flash” reference in Gemini desktop code, but Google has not publicly announced a model under that name. Separate reports about an Arena model labeled “spicy-mayo” have fueled speculation, although the connection remains unconfirmed. There is no confirmed release date, pricing, or public API for Nano Banana 2.5.

What Is Nano Banana 2.5?

Nano Banana 2.5 is the name circulating around a possible update to Google’s Nano Banana image-generation family. The clearest published lead is a September 5 report from TestingCatalog, which describes a reference to “Nano Banana 2.5 Flash” in code associated with the Gemini desktop app.

That gives the discussion a specific source, but it does not establish a final product name, feature set, or launch plan. Google’s public image-generation documentation does not currently list Nano Banana 2.5 as an available model.

What Has Been Reported So Far?

The “Nano Banana 2.5 Flash” Code Reference

TestingCatalog’s article, authored by Bedros Pamboukian and Alexey Shabanov, reports that Gemini desktop code points to a potential Nano Banana upgrade. It also embeds a September 4 post from Pamboukian mentioning the name.

This is evidence of a reported development reference. It does not tell us whether Google will release a model with that exact name, when it might arrive, or how it will compare with existing models.

The “Spicy Mayo” Reports

A separate thread of discussion concerns an image-model label called “spicy-mayo.” In a September 14 report, PicVane describes finding that label in public configuration data associated with Arena’s text-to-image leaderboard. According to the report, the record does not identify a provider or a public product name.

Arena, formerly LMArena, is an AI evaluation platform founded by UC Berkeley researchers and operated by Arena Intelligence Inc. It should not be described as Google’s internal testing environment. See Arena’s official company information.

The key distinction: a reported Nano Banana code reference and an Arena model label are two separate observations. Neither establishes that spicy-mayo belongs to Google or that it is Nano Banana 2.5.

Nano Banana 2.5 Status at a Glance

Is Nano Banana 2.5 the Same as Gemini 2.5 Flash Image?

The names should not be treated as interchangeable. Gemini 2.5 Flash Image is the documented model associated with the original Nano Banana. “Nano Banana 2.5” is the reported name discussed in this article.

Google’s official documentation distinguishes these existing models:

• Nano Banana: Gemini 2.5 Flash Image.
• Nano Banana 2: Gemini 3.1 Flash Image.
• Nano Banana 2 Lite: Gemini 3.1 Flash Lite Image.
• Nano Banana Pro: Gemini 3 Pro Image.

The “2.5” in the original Gemini model name does not establish a connection to the rumored Nano Banana 2.5 update.

Separately, Google’s Gemini API deprecation schedule lists October 2, 2026 as the shutdown date for gemini-2.5-flash-image. That is an API lifecycle date for the original model, not a release date for Nano Banana 2.5.

What Would Make Nano Banana 2.5 Worth an Upgrade?

The sources reviewed here do not establish a reproducible performance comparison for a confirmed Nano Banana 2.5 model. Early impressions of an anonymous build cannot establish how a final release will perform.

If Google announces the model, these are the practical questions worth testing:

• Prompt accuracy: Does it follow detailed instructions and place objects correctly?
• Text rendering: Can it reproduce requested wording accurately and legibly?
• Reference consistency: Does it preserve faces, products, and visual details across edits?
• Editing precision: Can it change one element while preserving the rest of an image?
• Speed and cost: How do generation time and pricing compare at equivalent output settings?

These are evaluation criteria, not announced features. Useful comparisons should identify the model, prompts, settings, and outputs so readers can assess the results.

Can You Use Nano Banana 2.5 Today?

There is no confirmed public release available under the Nano Banana 2.5 name as of this article’s update date. Reports of an anonymous Arena model do not establish access to a verified Nano Banana 2.5 product.

For image creation today, OpenArt offers Nano Banana 2, Nano Banana Pro, and Nano Banana 2 Lite. You can explore the available options in Create Image.

To get started with Nano Banana 2, select the model, describe the image you want, and add a reference image if needed. Generate a result, then refine your prompt or continue editing.

Frequently Asked Questions

Is Nano Banana 2.5 an Official Google Model?

Google has not publicly announced a model under that name as of September 15, 2026. TestingCatalog has reported a “Nano Banana 2.5 Flash” code reference, but a development reference does not confirm a release.

When Is Nano Banana 2.5 Coming Out?

There is no confirmed release date. Dates published without a Google announcement should not be treated as a launch schedule.

Will Nano Banana 2.5 Be Free?

Pricing and free access have not been announced. Availability may differ across consumer apps, developer APIs, and third-party platforms if the model launches.

Is Spicy Mayo Nano Banana 2.5?

That connection remains unconfirmed. The reported Arena label does not establish the model’s provider or its relationship to the Nano Banana 2.5 Flash code reference.

Can I Use Nano Banana 2.5 on OpenArt?

Not currently. You can use the existing Nano Banana models linked above and check OpenArt’s available model selection for future additions.