How to Use GPT Image 2.5: What's New and 3 Prompts to Try

By Qing, maker of MICT

Changing a background is one task. Keeping the product intact is another. The same goes for updating a poster: a correct new headline is not enough if the rest of the design changes with it.

This GPT Image 2.5 tutorial focuses on those practical editing questions. You will find a summary of the announced upgrades, three prompts to copy, and a checklist for judging each result.

Disclosure: I build MICT. This is a tutorial for my own product, not an independent review. MICT is not affiliated with OpenAI.

GPT Image 2.5 vs. GPT Image 2: what changed?

OpenAI announced ChatGPT Images 2.5 on September 8, 2026. Its release announcement emphasizes better reference preservation, more focused edits, greater consistency across revisions, and more natural lighting and textures.

GPT Image 2 already supported generation, text rendering, and reference-based editing, as documented in OpenAI’s model reference. The point is not that these tasks are new, but whether the newer model follows your requirements more reliably.

Area	What OpenAI highlights for 2.5	What to inspect
Reference fidelity	Stronger preservation of the original subject.	Product shape, lettering, color, and small components.
Targeted editing	More selective changes with less disruption elsewhere.	Whether untouched text and artwork stay intact.
Successive edits	Better retention of earlier changes.	Whether a new revision undoes an approved one.
Lighting and materials	More natural light and richer surface detail.	Fabric, reflections, and contact shadows.

This is a summary of OpenAI’s stated improvements, not a scored comparison from my own testing. The exercises below give you specific details to inspect rather than a promise that every output will be correct.

Can you try GPT Image 2.5 with free credits?

As of September 9, 2026, MICT offers 20 signup credits for new accounts. Its published image options are:

Output option	Credits per image	With 20 unused credits
1K	10	2 outputs
2K	15	1 output; 5 credits left
4K	20	1 output

These are signup credits, not unlimited free generation. Check the workspace estimate before submitting. Each new generation or edit uses credits.

My suggestion: start at 1K and choose either two attempts at Prompt 1, or the two-step poster exercise in Prompts 2 and 3. Two outputs will not cover all three prompts, and a usable result may require retries.

How to use GPT Image 2.5 in MICT

1. Open GPT Image 2.5 in MICT and sign in.
2. Enter the image workspace, select Image to Image, and upload one JPG or PNG reference.
3. For these exercises, keep the reference’s aspect ratio and begin with 1K.
4. Paste a prompt, review the credit estimate, and generate. Save the result before starting a follow-up edit.

The images below are MICT’s AI-generated practice inputs, not model-comparison results. Use your own images or these starting references. If a reference downloads as WebP, convert it to JPG or PNG before uploading.

Prompt 1: change the setting without redesigning the product

Focus: reference preservation, material detail, and lighting. Start with the ORBIT concept speaker below. For a different product, replace the product-specific details in the prompt.

Practice input: the ORBIT concept speaker. Open reference image.

Edit the uploaded ORBIT speaker photo.

Preserve the ivory woven fabric, rounded body, both silver top controls, orange carrying loop, and black ORBIT wordmark. Keep the product's shape, proportions, camera angle, size, and position in the frame unchanged.

Replace only the background and supporting surface with a pale travertine tabletop and a softly blurred warm-gray interior.

Match the original lighting direction and add a believable contact shadow. Keep the fabric ivory rather than tinting it to match the room.

Do not redesign the speaker, add props, change the lettering, or introduce extra parts. Keep the landscape 3:2 composition.

Check the result: compare both controls, the loop, the wordmark, and the outline with the original. Zoom in on the fabric. Then inspect the new tabletop and contact shadow. An attractive room does not compensate for a redesigned speaker.

Prompt 2: replace a headline without changing the artwork

Focus: targeted editing. Use this poster as the reference, or adapt the quoted text to a poster you own.

Practice input: the RAMEN NIGHTS poster. Open reference image.

Edit the uploaded ramen poster.

Replace only the headline "RAMEN NIGHTS" with the exact words "NOODLE NIGHTS".

Keep the original red lettering style, letter height, alignment, and headline position as close to the reference as possible.

Preserve the bowl, food, chopsticks, red circle, blossoms, mountain illustration, cream background, paper texture, and the smaller text "OPEN LATE".

Do not redraw the artwork, add new words, or change any other part of the poster. Keep the portrait 2:3 composition.

Check the result: read every letter of “NOODLE NIGHTS” and “OPEN LATE.” Compare the bowl, eggs, chopsticks, and decorative artwork. The intended change is the headline, not a new interpretation of the whole poster.

Save a version with the correct headline before continuing. If it contains errors, revise from the original rather than carrying those errors into the next exercise.

Prompt 3: make a second edit while retaining the first

Focus: consistency across successive edits. Upload your saved result from Prompt 2—not the original RAMEN NIGHTS poster. This time, change the background while keeping the new headline.

Edit this latest version of the poster.

Change only the cream paper background to pale gray. Preserve its existing paper texture.

Keep the headline "NOODLE NIGHTS" and the smaller text "OPEN LATE" exactly as they are.

Preserve the red lettering, red circle, blossoms, mountain illustration, bowl, food, chopsticks, and all layout positions. Do not recolor the food or alter the artwork.

Do not add new elements or revert any earlier edits. Keep the portrait 2:3 composition.

Check the result: is the paper now pale gray? Does the headline still say “NOODLE NIGHTS”? Have the food, artwork, or layout changed? Compare all three stages: the original, the headline edit, and the background edit.

This is a short editing sequence, not proof of unlimited consistency. To explore further, request one additional change at a time and inspect the entire image after each round.

How to make a useful GPT Image 2 vs. 2.5 comparison

For a model comparison, use the same source, prompt, dimensions, and an explicit quality setting both models support. Record the exact model: the 2.5 family includes Flare and Sunburst. For successive edits, each model should continue from its own previous output. Repeat attempts rather than judging consistency from one image. These principles follow OpenAI’s evaluation guidance.

Keep two questions separate: Did this edit work? and Did one model outperform the other? A before-and-after image can answer the first. It does not answer the second without a comparable result from both models.

Frequently asked questions

Do I need a long prompt?

For these exercises, I recommend writing the requested change first, then listing the details you will inspect. Add a constraint because it matters to the result, not simply to make the prompt longer.

Will product labels and untouched areas stay exactly the same?

Do not treat that as guaranteed. OpenAI notes that repeated edits can still alter protected details. Where an area must remain pixel-identical, use conventional compositing to combine an accepted edit with the original instead of relying on prompting alone.

Should I start at 4K?

I suggest testing the idea at 1K first. If you need a larger final image, choose the appropriate available size and inspect that output too. A larger file is not a substitute for correct lettering, geometry, or composition.

Start with one change you can judge

Choose one task: a new setting, a corrected headline, or a follow-up edit that preserves the previous work. Save the source, prompt, settings, and result together.

Try GPT Image 2.5 in MICT and use your available signup credits for a first attempt. Start small, inspect the details, and decide what to change next.