Auto ratio is a starting point
Auto lets the model choose a shape, which is fine for exploration. Set an explicit ratio once a layout needs to fit a specific placement.
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Make Detailed, Edit-Ready Images with GPT Image 2.5
GPT Image 2.5 is OpenAI's image model for everyday generation and careful edits. Write a long brief of up to 5,000 characters, or upload as many as 16 reference images and say which parts to keep, then choose 1K, 2K or 4K and check the credit cost before you submit.
What GPT Image 2.5 Is Good At
OpenAI released the 2.5 generation in September 2026 with faster generation and steadier edits. Here is what the generator on this page lets you use.
Briefs that run long
The prompt box takes up to 5,000 characters, so you can specify layout, materials, lighting and every line of text in one request instead of splitting it up.
Sixteen reference images for edits
Switch to edit mode and upload up to 16 images. OpenAI notes better preservation of subjects from reference photos than the previous generation.
Three sizes, nine shapes
Pick 1K, 2K or 4K and an aspect ratio from auto, 1:1, 3:2, 2:3, 4:3, 3:4, 16:9, 9:16 and 21:9. Prices are 5, 8 and 13 credits.
Faster, steadier everyday output
OpenAI says generation latency is down by up to half compared with the previous version, with more natural light and richer texture in the results.
Prompting GPT Image 2.5 for Reliable Results
OpenAI's own guidance is to define the result first and describe visible details after. The habits below follow that order and carry over to edits.
Start with the deliverable
Say what the image is for, such as a product hero, a poster or a diagram, then give the subject, the composition and any space that must stay empty for copy.
Quote text and count it
Put the exact words in quotes, say how many times they appear, and describe position and lettering. Ask for no extra text so stray words do not creep in.
Edit with a fence
Write change only the background, then list what must stay: identity, geometry, layout, lighting and labels. Restate the fixed parts on every round of edits.
Spell unusual names
For rare words or brand names, spell them out letter by letter. OpenAI notes that precise text placement can still be hard, so check dense or small type closely.
Three GPT Image 2.5 Looks to Aim For
A macro photograph of a watch movement
Polished steel bridges, gold gears and ruby jewels sit in a shallow-focus close-up on dark velvet. The prompt behind this kind of image names the lens distance, the metals and one hard key light.
A vintage topographic map with its own legend
Contour lines, labelled summits with heights, a compass rose, a scale bar and a legend share one aged-paper sheet. It is a demanding test of text and layout, and a reminder to proofread every label.
A cinematic sci-fi hangar scene
A white shuttle with its ramp down waits on a wet deck, with cables across the floor, steam in the air and tiny crew far off. Depth cues and reflections come from describing the space, the weather indoors and the light sources.
GPT Image 2.5 Production Notes
Tell it what to leave empty
If a banner needs room for a headline later, say which side stays clear. Models fill space unless you ask them not to.
Keep your best prompt
Save the full text of any prompt that worked together with its resolution and ratio, so a client revision starts from a known good brief.
Projects That Fit GPT Image 2.5
Product photography variations
Upload packshots and move them into new scenes while the label, shape and colour stay put.
Posters and flyers
Specify headline, subhead and date in one brief, and use 21:9 or 9:16 for the format your channel needs.
Maps, charts and diagrams
Ask for labelled graphics with a legend and scale, then correct individual labels with targeted edits.
Concept art and storyboards
Produce 16:9 frames for a pitch, with the same location described again in every frame to keep it consistent.
Marketing sets at two price points
Explore at 1K for 5 credits and spend 8 or 13 only on the images that go live.
Edits across many references
Combine up to 16 images, such as a model, a garment and a backdrop, and state which element comes from which file.
GPT Image 2.5 Questions, Answered
GPT Image 2.5 is OpenAI's image generation and editing model, announced in September 2026 alongside Images 2.5 in ChatGPT. This page uses its fast, everyday tier.
Up to 16. Edit mode needs at least one image, while text-to-image needs none.
1K, 2K and 4K, with 1K selected by default. Aspect ratios are auto, 1:1, 3:2, 2:3, 4:3, 3:4, 16:9, 9:16 and 21:9.
A 1K image costs 5 credits, 2K costs 8 and 4K costs 13. Text generation and editing are the same price, and the number of reference images does not change it.
Up to 5,000 characters. That is enough for a full layout brief with several lines of text and detailed notes on materials and lighting.
OpenAI states that generation latency is down by up to 50 percent compared with Images 2.0. Actual time depends on resolution and prompt complexity.
Quote the words, give their position and style, and ask for no additional text. OpenAI says text is improved but placement can still struggle, so zoom in and proofread.
Begin with change only the thing you want to alter, then list the elements that must remain. Repeated edits can drift, so repeat the important constraints each time.
OpenAI lists recurring characters and brand elements across separate generations as a limit. Use the same reference images in edit mode to keep them closer.
No. This generator runs the fast tier without a quality or format selector, and you choose only the resolution and aspect ratio.
GPT Image 2.5 is 5, 8 and 13 credits at 1K, 2K and 4K, against 7, 10 and 15 for Nano Banana 2. The two models also differ in what they are good at, so test the same brief on both.
Start Your Next Image with GPT Image 2.5
Write the brief, add references for edits and see the credit cost before you submit.