TOOL API

banana_image_generation

Banana image generation (Gemini 3 Pro Image, also known as Nano Banana Pro): text-to-image with strong in-image text and detail. Spec: synchronous, returns the image directly with no job_id. aspect_ratio defaults to 1:1; all models accept 1:1, 3:2, 2:3, 4:3, 3:4, 5:4, 4:5, 16:9, 9:16, 21:9; 4:1, 1:4, 8:1, 1:8 only on Gemini 3.1 Flash Image (other models return an error); 9:21, 16:10 and any other ratio return an error. quality defaults to 1K and only 1K is accepted. Echoed pixels follow the Gemini 3 1K table (e.g. 16:9 = 1376x768). Invalid parameters are rejected before the upstream call (isError) and are not charged.