Is nano-banana-pro:official an independent new model?
It is the public invocation ID for Nano Banana Pro, with Google Gemini 3 Pro Image as the underlying model. :official distinguishes the invocation endpoint and should not be understood as a new native version. When using it, enter the full ID and structure requests according to the operations, aspect ratio, and resolution options provided by this endpoint.
How do I choose between generating a new image and modifying an existing one?
Use generate when creating from text; use edit when modifying or compositing around an existing image, and provide reference images through image_urls. Both operations require a prompt. Edit prompts should preferably specify separately what needs to change and which subject, colors, or layout must be retained.
How can I improve the usability of text in posters?
Provide exact copy, and clearly specify the position and visual hierarchy of titles and descriptive text; avoid cramming all information into a very small area. Proofread character by character after generation, and shorten the text or revise in multiple passes if necessary. For designs that must strictly use specified fonts, you can use the generated result as a visual draft and continue typesetting.
Can I directly generate a 4:5 image?
The aspect ratio options for this endpoint do not include 4:5; you can choose 1:1, 3:2, 2:3, 16:9, 9:16, 4:3, or 3:4. If delivery requires 4:5, it is recommended to first generate using a similar portrait ratio, reserve edge space in the prompt, and then crop to the target size to avoid cutting off text and the main subject.
How do I continue editing and receive generated results?
Place the URL of the generated image into image_urls in the next editing request, and write specific modification goals. After submitting via POST /nano-banana/images, the result includes a task identifier and image link; batch workflows can combine async and callback_url to receive results after the task is complete.