# GPT Image Prompt GPT Image 2.5

> Canonical: https://gptimagesprompt.com/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.

### How many credits does GPT Image 2.5 use?

GPT Image 2.5 draws between 10 and 30 credits per run, depending on the model and length chosen in the form.

### What limits should I check before using GPT Image 2.5?

Generated output from GPT Image 2.5 can contain visual, audio, or factual errors. Review each result before publishing, and upload only material you are authorized to use. Where the form accepts a reference image, supported files are JPEG, PNG, WebP up to 30 MB each.

### What happens to the files I upload to GPT Image 2.5?

An upload is stored against your own account, not pooled with other people's. Deleting the account removes it: the control is in Settings under Security, the request is confirmed by email, and the erasure removes the stored objects it owns. How long anything else is kept, and which processors handle it, is stated in the privacy policy.

### Can I use what GPT Image 2.5 makes commercially?

Every paid plan includes a commercial licence for what GPT Image 2.5 makes; the free tier is for personal use.

### How does GPT Image 2.5 compare, and what alternatives fit a different workflow?

GPT Image 2.5: GPT Image Prompt GPT Image 2.5 offers Sunburst and Flare for text prompts or reference edits, with 1K–4K sizes and transparent background controls. Related options are GPT Image Prompt: GPT Image Prompt text to image testing: generate, compare variants, and refine with the prompt kept beside the result it produced and GPT Image Prompt Video Generator: The GPT Image Prompt video generator: take a prompt that works as a still, add motion and camera direction, and generate the shot. Choose by the required input, delivered output, controls, limits, current availability, and credit cost; the related-tools section links each canonical page.

## Continue with your image

## Related tools

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

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

_Last updated July 21, 2026_