NanoBanana API Config

"NanoBanana" is Google's codename for its Gemini image-generation model - the one that got a lot of attention for how well it edits and composes images from a plain description. This node is the settings box for it. It's the image-generation counterpart to the generic LLM API Config: where that one configures a text model, this one configures NanoBanana with the knobs an image model needs - aspect ratio, resolution, and what kind of output you want back. The pack's README describes it plainly as a preset for Gemini 2.5 Flash Image.

Where it sits

Same three-node pattern as the rest of the art-venture LLM nodes. This Config wires into a Chat node, and you pair it with the Gemini API node that carries your Google API key. Config describes the image you want; the API node provides access; the LLM Chat node runs it and returns the picture. Because Gemini is a multimodal model, the chat can take your text (and optionally reference images) and hand back a generated image on the images output.

The inputs that matter

• model - nano-banana, nano-banana-2, or nano-banana-pro. The newer/pro entries are the more capable revisions; pick based on what your account can reach.
• aspect_ratio - auto, or a fixed ratio from 1:1 through 21:9. This is how you get portrait, landscape, or widescreen output without cropping later. auto lets the model decide.
• resolution - 1K, 2K, or 4K. Higher is sharper and slower (and, on a paid API, costs more per image).
• modalities - image+text, image, or text. This controls what comes back: pick image+text when you want the picture plus the model's commentary, image for just the render.
• temperature - 0 to 1 (default 0.5), the usual creativity dial.

The output is an LLM_CONFIG for the Chat node.

Installing it

ComfyUI Manager → search comfyui-art-venture → install → restart. Or:

cd ComfyUI/custom_nodes
git clone https://github.com/sipherxyz/comfyui-art-venture

then restart ComfyUI. It's pre-installed on comfy.icu.

Common issues

The pack-wide one: a red "missing" node means art-venture isn't installed. Manager → "Install Missing Custom Nodes."

The real catch is that this is a cloud, closed-model node. Unlike a local checkpoint, NanoBanana runs on Google's servers, so you need a working Gemini API key, network access, and whatever billing/quota Google requires for the model tier you selected. No key or no access to that model, and the Chat node errors - the Config itself never complains because it's just settings. If your nano-banana-pro request fails, check whether your API key actually has access to that specific model before blaming the workflow. And if you set modalities: text and wonder where your image went - that's you telling it not to return one. For pictures, keep it on image or image+text.