GPT Image 1.5: 6 Prompt Tests for Text and Edits - Wiro AI

GPT Image 1.5 targets two jobs: clean text-to-image generation and controlled image edits. This review runs six focused tests to see how it handles lighting, typography, and tight constraints.

Model link

https://wiro.ai/models/openai/gpt-image-1-5

Settings used

size	3:2
quality	high
output format	jpeg (compression 90)
samples	1 per prompt
moderation	low

Prompt tests

1) Macro product shot (highlights + reflections)

The prompt asks for small ripples, sharp specular highlights, and a tight lens look. These details often expose shaky materials.

Macro product photo of a matte black coffee mug on wet slate with studio lighting — Prompt: Macro product photo of a matte black ceramic coffee mug on wet black slate. One espresso drip falls into a shallow puddle and makes small ripples. Softbox key light from the left, rim light from the right, sharp specular highlights, realistic reflections, shallow depth of field, 85mm lens look, high detail.

The lighting reads like a real studio setup. Reflections stay believable and the surface texture looks consistent.

2) Chalkboard menu (text rendering test)

Small spelling errors ruin menu and sign prompts. This test forces four short lines that should stay readable.

Coffee shop chalkboard menu on a brick wall with handwritten chalk text — Prompt: Photo of a small coffee shop chalkboard menu on a brick wall. The chalk text must be clear and spelled exactly as written. Text lines: DRIP COFFEE 3 ; OAT LATTE 5 ; CROISSANT 4. Add a small line at the bottom that says OPEN 7AM. Handwritten chalk style, warm indoor lighting, shallow depth of field.

Letter shapes look clean enough for a quick read. Tiny kerning quirks can still appear in long lines.

3) Packaging mockup (brand text + layout)

Packaging needs both realism and typography control. The wrapper also tests if the model keeps straight edges.

Protein bar wrapper mockup with modern typography on a light gray surface — Prompt: Studio mockup of a wrapped protein bar on a light gray surface. Minimal shadows. The wrapper design must have clear text. Large brand text: MOUNTAIN FUEL. Subtitle text: Cocoa + Sea Salt. Small line: 12g protein. Modern sans serif typography, clean layout, premium look, high detail.

The wrapper reads like a real photo mock. Text stays mostly sharp when the design stays simple.

4) Glass + mirror scene (hard reflections)

Reflections, condensation, and bokeh can clash. This prompt pushes for realism across many bright highlights.

Photorealistic iced tea glass with condensation next to a small mirror and window bokeh — Prompt: Photorealistic scene: a tall glass of iced tea with lemon on a wooden table next to a small round mirror. Afternoon sun comes through a window and creates strong reflections on the glass, table, and mirror. Condensation droplets on the glass, sharp highlights, soft background bokeh with a city street outside the window, realistic depth of field, high detail.

Materials hold up well. The scene keeps a coherent light direction and believable specular behavior.

5) Childrens book illustration (style control)

Stylized work fails when edges get muddy. This test asks for clean ink lines and soft watercolor fills.

Children book illustration of a raccoon astronaut making pancakes in a space station kitchen — Prompt: Children book illustration, clean ink lines and soft watercolor fills. A raccoon in a small orange astronaut suit floats in a cozy space station kitchen while making pancakes. Warm light, cute details, readable shapes, simple background, high quality illustration.

Shapes stay readable and the palette stays controlled. Simple backgrounds help the style stay crisp.

6) Image edit (keep subject, change background)

This edit keeps the watch intact while changing the surface and removing droplets. The goal: test constraint following.

Original watch product photo with water droplets — Input image.

Edited watch product photo on a clean white studio background — Prompt: Keep the watch exactly the same. Change the background to a clean white seamless studio backdrop. Remove all water droplets. Add a soft realistic shadow under the watch. Do not change the watch shape, text, hands, or bezel. Keep a premium product photo look.

The edit keeps the product identity while simplifying the scene. Edits like this work best with very strict constraints.

What worked well

Product lighting cues stay consistent in studio-style prompts.
Simple text layouts can stay readable when lines stay short.
Material rendering looks stable in glass, metal, and wet surfaces.
Constraint-heavy edits can hold the main subject shape.

Where it struggled

Long text blocks can drift in spacing or letter shapes.
Busy layouts increase the odds of small typos and warped edges.

Prompt tips that helped

State the main subject first, then lighting, then camera look.
For text, keep lines short and list them explicitly.
For edits, say what must not change in one clear sentence.

Quick run-time notes

Test	Focus	Generation time (seconds)
1	macro highlights + reflections	51
2	chalkboard text rendering	45
3	packaging typography + layout	45
4	glass + mirror reflections	55
5	illustration style control	54
6	edit constraints + background swap	42

Try it

Run GPT Image 1.5