GPT Image 2.5 Inpaint

Endpoint

POST https://api.roasos.com/v1/image-edit/gpt-image-2.5

Send your API key as a bearer token. The key needs the scope api:write. Every paid request also needs an Idempotency-Key header.

The envelope fields quote_only, quote_id, webhook_url and wait_timeout_seconds behave the same on each model endpoint. Refer to Jobs and Quotes and credits.

Good at

GPT Image 2.5 Sunburst makes "edits scoped precisely to the instruction, with subject and composition preserved across many rounds of revision". Use this endpoint when one region must change and the rest of the picture must stay exactly as it is: replace a label, remove an object, open a closed door. The mask states which region to edit. The output is one PNG at high quality, at the source dimensions and with the source background (background is pinned to auto). Use /v1/image/gpt-image-2.5 in edit mode when the whole image may change, and /v1/image/nano-banana-pro when identity or product placement matters. Do not use it for a whole-image restyle; the mask has meaning against one source only.

Pricing

The unit is one operation. Pricing key: gpt-image-2.5-inpaint.

The credits come from the roasOS pricing table. No other field changes the price. To get the exact price of your request, send it with quote_only: true first.

Modes

• inpaint

Provider endpoints: openai/gpt-image-2.5/sunburst/edit.

Request fields

The schema is strict. A field that is not in this table gets 400 unsupported_option. The field names are the roasOS role names. One role has one name in every family.

Media

This endpoint accepts these media roles:

• image_url — first frame (or the single source image)

Every other role is refused: avatar_id, elements, product_id, product_images, references, reference_images, end_image_url, scene_id, scene_image, video_urls, video_url, audio_urls, audio_url, voice_id. A refused role gets 400 unsupported_option.

Prompt

Limit: 10,000 characters. No wrapper is added. No tag syntax.

• Describe the finished content of the masked region, not the mask ("a matte black label with the words "Slow Evenings" in cream cursive").
• Name the material, the light direction and the perspective so the region matches the rest of the picture.
• Put rendered text inside quotation marks.
• Do not describe the parts of the image outside the mask; they do not change.
• On a bad result, adjust the mask or the prompt; do not resend the same payload.

Not exposed

These catalog entries describe omitted inputs, pinned values and source constraints. They do not imply that the provider accepts every listed field.

• background — pinned to auto.
• image_size — pinned to auto.
• num_images — pinned to 1.
• output_compression — not accepted by this public endpoint.
• output_format — pinned to png.
• quality — pinned to high.
• sync_mode — pinned to false.

Result

The result kind is image. Always present: nothing. Present when the run makes it: avatar_id, full_body_url, images, portrait_url, provider_seed, reference_sheet, url.

{
  "data": {
    "id": "gen_…",
    "kind": "image",
    "model": "gpt-image-2.5",
    "status": "completed",
    "result": {
      "avatar_id": "00000000-0000-4000-8000-000000000000",
      "full_body_url": "https://cdn.roasos.com/workspaces/ws_01/full_body_url",
      "images": [
        "https://cdn.roasos.com/workspaces/ws_01/images-1.png"
      ],
      "portrait_url": "https://cdn.roasos.com/workspaces/ws_01/portrait_url",
      "provider_seed": 0,
      "reference_sheet": "https://cdn.roasos.com/workspaces/ws_01/reference_sheet",
      "url": "https://cdn.roasos.com/workspaces/ws_01/result"
    }
  }
}

The files are immutable objects on https://cdn.roasos.com. A result URL is a valid media input for your next request.

Example

The three steps are always the same: quote, run, poll.

# 1. Quote. Nothing is spent.
curl -X POST https://api.roasos.com/v1/image-edit/gpt-image-2.5 \
  -H "Authorization: Bearer roasos_sk_live_..." \
  -H "Idempotency-Key: 0f1c9e2a-gpt-image-2.5-0001" \
  -H "Content-Type: application/json" \
  -d '{"quote_only":true,"image_url":"https://cdn.roasos.com/workspaces/ws_01/uploads/image_url.png","mask_url":"https://cdn.roasos.com/workspaces/ws_01/uploads/mask_url.png","prompt":"A woman holds the bottle at eye level in a bright kitchen, morning light, static camera."}'
# 200 { "data": { "kind": "quote", "quote_id": "q_7Hk...", "credits": 7, "expires_at": "...",
#        "confirmation": { "model": "gpt-image-2.5", "example": "1_image" } } }

# 2. Run. Same body, same Idempotency-Key, quote_id in place of quote_only.
curl -X POST https://api.roasos.com/v1/image-edit/gpt-image-2.5 \
  -H "Authorization: Bearer roasos_sk_live_..." \
  -H "Idempotency-Key: 0f1c9e2a-gpt-image-2.5-0001" \
  -H "Content-Type: application/json" \
  -d '{"quote_id":"q_7Hk...","image_url":"https://cdn.roasos.com/workspaces/ws_01/uploads/image_url.png","mask_url":"https://cdn.roasos.com/workspaces/ws_01/uploads/mask_url.png","prompt":"A woman holds the bottle at eye level in a bright kitchen, morning light, static camera."}'
# 201 { "data": { "id": "gen_...", "status": "queued", "credits_reserved": 7 } }

# 3. Poll, then read the result.
curl https://api.roasos.com/v1/jobs/gen_.../status -H "Authorization: Bearer roasos_sk_live_..."
curl https://api.roasos.com/v1/jobs/gen_.../result -H "Authorization: Bearer roasos_sk_live_..."

Today

POST /v1/image-edit/gpt-image-2.5 is live. POST /v1/generations has no inpaint type, so this endpoint is the only public surface. The endpoint measures the source and the mask before the quote. The mask must have the same width and height as the source. A mask of another size gets 400 unsupported_media. The source is JPEG, PNG or WebP; the mask is PNG. White marks the region to edit. The retired /v1/image-edit/gpt-image-2 answers 404.

See also

• llms.txt for this model — the same facts as one plain-text file for an agent.
• GET https://api.roasos.com/v1/catalog/gpt-image-2.5 — the machine-readable form: enums, defaults, limits and prices. Refer to the API reference.
• Jobs — how to poll a job and read its result.
• Provider endpoints: openai/gpt-image-2.5/sunburst/edit.