I compared ChatGPT and Gemini’s AI image generation

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Welcome to Prompt of the Day, where we show you an AI prompt you can use for work, play, or anything in between, sourced from our community of AI experts and professionals. 

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Struggling to use AI image generators? Today’s prompt comes from ZDNET contributor Lance Whitney, who suggests letting a chatbot design the perfect image-creating query for its corresponding generator. 

Prompt: 

I would like to create an image of a sunflower made of sheet metal in a pencil drawing style. Generate a prompt that I can use to request this image from [Nano Banana or ChatGPT Images]. 

The process is simple: “In my prompt, I supply just the basic details of what I want and then ask the AI to generate a full prompt based on that,” Whitney said. 

Another benefit: When chatbots design their own image prompts, they avoid including language that the generator might flag or refuse, which makes your querying process smoother. 

I tested it out with Gemini and ChatGPT for their respective image generators, Nano Banana and ChatGPT Images. 

Example #1: Gemini

Gemini returned: 

A pencil drawing of a metal sunflower. The flower, its petals, the leaves, and the stem are composed of sculpted pieces of metal sheet. The texture of the metal is clear, with imperfections and visible welds. The drawing is detailed, with shading that creates depth and texture, emphasizing the three-dimensional nature of the sculpture. The pencil lines are visible. The flower stands in a garden with other blurry plants in the background.

Gemini suggested more detail than I would have known to add on my own prompt. The description might’ve been kind of a tall order, but when I used it in Nano Banana, it gave me a decent image of a metal-ish sunflower. 

Example #2: ChatGPT

ChatGPT returned:

A detailed pencil drawing of a sunflower constructed from sheet metal. The petals are shaped from thin, slightly curved metal plates with visible seams, rivets, and subtle bends. The center of the sunflower is composed of layered metal textures resembling industrial components, yet arranged organically. The stem and leaves are also metallic, with etched vein details and light wear. Rendered in a realistic graphite pencil style with fine linework, cross-hatching, and soft shading. High contrast between light and shadow, emphasizing texture and depth. Minimal background (white or lightly sketched), with the focus entirely on the metallic sunflower. Artistic, precise, and slightly surreal.

Again, tons of helpful detail, ostensibly written for what ChatGPT Images will specifically respond to, which yielded a very successful image. 

If the prompt the chatbot gives you is too long, Whitney advises you to just ask for a shorter option, which usually works. 

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