
GPT Image 2.5 Flare Developer Edit API by OpenAI
GPT Image 2.5 Flare Developer Edit applies natural-language instructions to reference images at a flat per-image price by 1K / 2K / 4K resolution tier, with no token accounting to reason about. Ready-to-use REST inference API, best performance, no coldstarts, affordable pricing.
GPT Image 2.5 Flare Developer Edit is developed by OpenAI. Atlas Cloud (operated by Atlas Cloud AI LLC) provides access to it and does not own it. All trademarks belong to their respective owners.
GPT Image 2.5 Flare Developer Edit
GPT Image 2.5 Flare Developer is the developer edition of GPT Image 2.5 Flare, OpenAI's upgraded GPT Image generation model, reached through the OpenAI Images API. It exposes the same parameters, limits and output quality as the standard edition under its own model id. Generation is asynchronous: submit the request, then poll for the final image URL.
Highlights
- Up to 16 reference images in a single request.
- Arbitrary resolutions up to 3840x2160, and fully supported transparent backgrounds.
- Long prompts: up to 32000 characters.
Parameters
| Parameter | Required | Description |
|---|---|---|
model | Yes | openai/gpt-image-2.5-flare-developer/edit |
images | Yes | Up to 16 source images. Each entry is a URL, Base64 data, or an asset reference (asset://<ASSET_ID>). |
prompt | Yes | Instruction describing the desired edit. Up to 32000 characters. |
size | No | Output size as WIDTHxHEIGHT (for example 1536x864) or auto. Defaults to 1024x1024. The only control over output dimensions. |
background | No | auto, opaque, or transparent. transparent forces a png or webp output format. |
output_format | No | png, jpeg, or webp. Defaults to png. |
n | No | Number of images to generate, 1 to 10. Defaults to 1. Each image is billed separately. |
How To Use
curl -X POST "https://api.atlascloud.ai/api/v1/model/generateImage" \ -H "Authorization: Bearer $AIP_API_KEY" \ -H "Content-Type: application/json" \ --data-raw '{ "model": "openai/gpt-image-2.5-flare-developer/edit", "images": [ "https://static.atlascloud.ai/media/images/example-a.png", "https://static.atlascloud.ai/media/images/example-b.png" ], "prompt": "Replace the background with a sunlit meadow, keep the subject unchanged.", "size": "1536x1024" }'
Size
size is the only control over output dimensions. gpt-image-2.5 accepts
arbitrary resolutions, subject to:
- both edges at least 256 px, floored to a multiple of 16
- each edge at most 3840 px, and at most 3840x2160 in total
- aspect ratio between 1:3 and 3:1
Resolutions above 2560x1440 are experimental upstream. auto lets the model
choose, and is billed at the auto ceiling then settled down against the image
actually produced.
Notes
- Generation is asynchronous. Submit the request, then poll
/api/v1/model/prediction/{request_id}for the final image URL. - Pricing is per token, at OpenAI's list rates: image tokens 30.00/1M out, text input 2.00/1M and $1.25/1M respectively). The request is charged from the token usage the model actually reports, so the amount held at submit is an upper bound and the difference is refunded.
- This is the Developer edition. The request format, parameter set and limits are identical to
openai/gpt-image-2.5-flare/edit; only the model id differs. - Streaming (
stream,partial_images) andresponse_formatare not supported — the API always returns finished images re-hosted on AtlasCloud storage. - Source images are fetched and uploaded to the upstream API as multipart files, so URLs, Base64 payloads and
asset://references are all accepted.



















