# GPT Image Prompt GPT Image 2.5

> Canonical: https://gptimagesprompt.com/sv/gpt-image-2-5

Write the subject first, then the environment, framing and exclusions. Save the exact wording when comparing variants so that a changed brief does not obscure what the model choice changed.

## GPT Image Prompt GPT Image 2.5 prompt experiments

### Which variant should I test first?

Start with either Sunburst or Flare and retain the complete prompt for comparison. Kie documents equivalent controls without supplying a measured speed or quality winner.

## Technical specs

### 20,000

Prompt characters

### 30 MB

Per reference file

### 1K–4K

Output size options

### 1–4

Images per batch

## Who uses prompt comparisons?

### A practical starting point

Prompt writers can vary one instruction at a time and save the wording beside the output for later revision.

## Questions about prompt experiments

### How long can a prompt be?

The input budget is 20,000 characters, including your exclusions and composition instructions. Prefer precise directions over repeating adjectives, and inspect the output before revising one detail.

### How should transparency be phrased?

Select Transparent and write the isolation requirement into the brief. Sunburst at 2K/4K specifically needs no backdrop, scenery or shadow; for uploaded subjects, also ask to extract them.

### What can a comparison vary?

Compare model, background, crop and output size. Keep 8:9, 9:8, 27:16 and 16:27 at 1K; use other available ratios when evaluating 2K or 4K.

## Continue with your image

## Relaterade verktyg

### [GPT Image Prompt-bildgenerator](https://gptimagesprompt.com/sv/ai-image-generator)

### [GPT Image Prompt-videogenerator](https://gptimagesprompt.com/sv/ai-video-generator)

_Senast uppdaterad 21 juli 2026_