GPT Image 2.5 API reference

Name: GPT Image 2.5 API
Brand: OpenAI
Availability: InStock

Everything you need to call GPT Image 2.5 from your code. Base URL https://cheapergen.com/api/v1. Try it first in the playground.

Authentication

Create a key in Dashboard → API keys and send it as a bearer token. Keep keys server-side.

export CHEAPERGEN_API_KEY="cg_live_…"

# every request
Authorization: Bearer $CHEAPERGEN_API_KEY

GPT Image 2.5 Text to Image API

POST/api/v1/run/openai/gpt-image-2.5/text-to-image

Submits an asynchronous job and returns 202 with a generation id. Poll GET /api/v1/generations/{id} or pass webhook_url. See job lifecycle.

Input parameters

Name	Type	Description	Affects price
`prompt`required	string	Describe the shot: subject, action, camera movement, lighting and style.	No
`aspect_ratio`	string (enum)	Output image shape. Values: 1:1 · 3:2 · 2:3 · 4:3 · 3:4 · 5:4 · 4:5 · 16:9 · 9:16 · 21:9 · 9:21 Default: 1:1	Yes
`resolution`	string (enum)	Output size tier: 1K (≈1 MP), 2K (≈4 MP) or 4K (≈8 MP, experimental). Values: 1K · 2K · 4K Default: 1K	Yes
`quality`	string (enum)	Rendering effort. Higher quality uses more output tokens and costs more; xhigh and max are for final assets. Values: low · medium · high · xhigh · max Default: medium	Yes
`webhook_url`	string (URL)	Optional. We POST the finished generation here, signed with your webhook secret. Webhooks	No

Request

curl -X POST https://cheapergen.com/api/v1/run/openai/gpt-image-2.5/text-to-image \
  -H "Authorization: Bearer $CHEAPERGEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "prompt": "A minimalist poster for a jazz night called “BLUE HOUR”, saxophone silhouette, deep blue and brass, clean typography",
  "aspect_ratio": "1:1",
  "resolution": "1K",
  "quality": "medium"
}'

import os, time, requests

API = "https://cheapergen.com/api/v1"
headers = {"Authorization": f"Bearer {os.environ['CHEAPERGEN_API_KEY']}"}

# 1. Submit the job
job = requests.post(f"{API}/run/openai/gpt-image-2.5/text-to-image", headers=headers, json={
    "prompt": "A minimalist poster for a jazz night called “BLUE HOUR”, saxophone silhouette, deep blue and brass, clean typography",
    "aspect_ratio": "1:1",
    "resolution": "1K",
    "quality": "medium"
}).json()

# 2. Poll until it finishes (or pass "webhook_url" and skip polling)
while job["status"] in ("queued", "running"):
    time.sleep(3)
    job = requests.get(f"{API}/generations/{job['id']}", headers=headers).json()

print(job["status"], job["output"]["images"][0]["url"] if job["status"] == "succeeded" else job["error"])

const API = "https://cheapergen.com/api/v1";
const headers = {
  Authorization: `Bearer ${process.env.CHEAPERGEN_API_KEY}`,
  "Content-Type": "application/json",
};

// 1. Submit the job
let job = await fetch(`${API}/run/openai/gpt-image-2.5/text-to-image`, {
  method: "POST",
  headers,
  body: JSON.stringify({
    "prompt": "A minimalist poster for a jazz night called “BLUE HOUR”, saxophone silhouette, deep blue and brass, clean typography",
    "aspect_ratio": "1:1",
    "resolution": "1K",
    "quality": "medium"
  }),
}).then((r) => r.json());

// 2. Poll until it finishes (or pass webhook_url and skip polling)
while (job.status === "queued" || job.status === "running") {
  await new Promise((r) => setTimeout(r, 3000));
  job = await fetch(`${API}/generations/${job.id}`, { headers }).then((r) => r.json());
}

console.log(job.status === "succeeded" ? job.output.images[0].url : job.error);

Response

{
  "id": "gen_8c2QmX1nq0k4",
  "object": "generation",
  "model": "openai/gpt-image-2.5",
  "endpoint": "openai/gpt-image-2.5/text-to-image",
  "mode": "text-to-image",
  "status": "queued",
  "input": {
    "prompt": "A minimalist poster for a jazz night called “BLUE HOUR”, saxophone silhouette, deep blue and brass, clean typography",
    "aspect_ratio": "1:1",
    "resolution": "1K",
    "quality": "medium"
  },
  "output": null,
  "error": null,
  "cost": {
    "amount_usd": 0.2255,
    "currency": "usd",
    "estimated": true,
    "official_usd": null,
    "saved_usd": null
  },
  "source": "api",
  "started_at": null,
  "completed_at": null,
  "urls": {
    "get": "https://cheapergen.com/api/v1/generations/gen_8c2QmX1nq0k4",
    "cancel": "https://cheapergen.com/api/v1/generations/gen_8c2QmX1nq0k4/cancel"
  },
  "created_at": "2026-10-15T09:21:04Z"
}

{
  "id": "gen_8c2QmX1nq0k4",
  "object": "generation",
  "model": "openai/gpt-image-2.5",
  "endpoint": "openai/gpt-image-2.5/text-to-image",
  "mode": "text-to-image",
  "status": "succeeded",
  "input": {
    "prompt": "A minimalist poster for a jazz night called “BLUE HOUR”, saxophone silhouette, deep blue and brass, clean typography",
    "aspect_ratio": "1:1",
    "resolution": "1K",
    "quality": "medium"
  },
  "output": {
    "images": [
      {
        "url": "https://cdn.cheapergen.ai/outputs/gen_8c2Q-0.png",
        "content_type": "image/png",
        "width": 2048,
        "height": 2048
      }
    ]
  },
  "error": null,
  "cost": {
    "amount_usd": 0.2255,
    "currency": "usd",
    "estimated": false,
    "official_usd": 0.264,
    "saved_usd": 0.0385
  },
  "source": "api",
  "created_at": "2026-10-15T09:21:04Z",
  "started_at": "2026-10-15T09:21:06Z",
  "completed_at": "2026-10-15T09:22:31Z"
}

GPT Image 2.5 Image Edit API

POST/api/v1/run/openai/gpt-image-2.5/edit

Submits an asynchronous job and returns 202 with a generation id. Poll GET /api/v1/generations/{id} or pass webhook_url. See job lifecycle.

Input parameters

Name	Type	Description	Affects price
`prompt`required	string	Describe the shot: subject, action, camera movement, lighting and style.	No
`image_urls`required	string[] (URLs)	Up to 16 images to edit or combine. Refer to them as "image 1", "image 2"… in the prompt. Max items: 16	No
`aspect_ratio`	string (enum)	Output image shape. Values: 1:1 · 3:2 · 2:3 · 4:3 · 3:4 · 5:4 · 4:5 · 16:9 · 9:16 · 21:9 · 9:21 Default: 1:1	Yes
`resolution`	string (enum)	Output size tier: 1K (≈1 MP), 2K (≈4 MP) or 4K (≈8 MP, experimental). Values: 1K · 2K · 4K Default: 1K	Yes
`quality`	string (enum)	Rendering effort. Higher quality uses more output tokens and costs more; xhigh and max are for final assets. Values: low · medium · high · xhigh · max Default: medium	Yes
`webhook_url`	string (URL)	Optional. We POST the finished generation here, signed with your webhook secret. Webhooks	No

Request

curl -X POST https://cheapergen.com/api/v1/run/openai/gpt-image-2.5/edit \
  -H "Authorization: Bearer $CHEAPERGEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "prompt": "Keep the product and its label exactly; replace the background with a soft off-white studio sweep and add a natural shadow",
  "image_urls": [
    "https://cdn.cheapergen.ai/samples/portrait.jpg"
  ],
  "aspect_ratio": "1:1",
  "resolution": "1K",
  "quality": "medium"
}'

import os, time, requests

API = "https://cheapergen.com/api/v1"
headers = {"Authorization": f"Bearer {os.environ['CHEAPERGEN_API_KEY']}"}

# 1. Submit the job
job = requests.post(f"{API}/run/openai/gpt-image-2.5/edit", headers=headers, json={
    "prompt": "Keep the product and its label exactly; replace the background with a soft off-white studio sweep and add a natural shadow",
    "image_urls": [
        "https://cdn.cheapergen.ai/samples/portrait.jpg"
    ],
    "aspect_ratio": "1:1",
    "resolution": "1K",
    "quality": "medium"
}).json()

# 2. Poll until it finishes (or pass "webhook_url" and skip polling)
while job["status"] in ("queued", "running"):
    time.sleep(3)
    job = requests.get(f"{API}/generations/{job['id']}", headers=headers).json()

print(job["status"], job["output"]["images"][0]["url"] if job["status"] == "succeeded" else job["error"])

const API = "https://cheapergen.com/api/v1";
const headers = {
  Authorization: `Bearer ${process.env.CHEAPERGEN_API_KEY}`,
  "Content-Type": "application/json",
};

// 1. Submit the job
let job = await fetch(`${API}/run/openai/gpt-image-2.5/edit`, {
  method: "POST",
  headers,
  body: JSON.stringify({
    "prompt": "Keep the product and its label exactly; replace the background with a soft off-white studio sweep and add a natural shadow",
    "image_urls": [
      "https://cdn.cheapergen.ai/samples/portrait.jpg"
    ],
    "aspect_ratio": "1:1",
    "resolution": "1K",
    "quality": "medium"
  }),
}).then((r) => r.json());

// 2. Poll until it finishes (or pass webhook_url and skip polling)
while (job.status === "queued" || job.status === "running") {
  await new Promise((r) => setTimeout(r, 3000));
  job = await fetch(`${API}/generations/${job.id}`, { headers }).then((r) => r.json());
}

console.log(job.status === "succeeded" ? job.output.images[0].url : job.error);

Response

{
  "id": "gen_8c2QmX1nq0k4",
  "object": "generation",
  "model": "openai/gpt-image-2.5",
  "endpoint": "openai/gpt-image-2.5/edit",
  "mode": "edit",
  "status": "queued",
  "input": {
    "prompt": "Keep the product and its label exactly; replace the background with a soft off-white studio sweep and add a natural shadow",
    "image_urls": [
      "https://cdn.cheapergen.ai/samples/portrait.jpg"
    ],
    "aspect_ratio": "1:1",
    "resolution": "1K",
    "quality": "medium"
  },
  "output": null,
  "error": null,
  "cost": {
    "amount_usd": 0.2255,
    "currency": "usd",
    "estimated": true,
    "official_usd": null,
    "saved_usd": null
  },
  "source": "api",
  "started_at": null,
  "completed_at": null,
  "urls": {
    "get": "https://cheapergen.com/api/v1/generations/gen_8c2QmX1nq0k4",
    "cancel": "https://cheapergen.com/api/v1/generations/gen_8c2QmX1nq0k4/cancel"
  },
  "created_at": "2026-10-15T09:21:04Z"
}

{
  "id": "gen_8c2QmX1nq0k4",
  "object": "generation",
  "model": "openai/gpt-image-2.5",
  "endpoint": "openai/gpt-image-2.5/edit",
  "mode": "edit",
  "status": "succeeded",
  "input": {
    "prompt": "Keep the product and its label exactly; replace the background with a soft off-white studio sweep and add a natural shadow",
    "image_urls": [
      "https://cdn.cheapergen.ai/samples/portrait.jpg"
    ],
    "aspect_ratio": "1:1",
    "resolution": "1K",
    "quality": "medium"
  },
  "output": {
    "images": [
      {
        "url": "https://cdn.cheapergen.ai/outputs/gen_8c2Q-0.png",
        "content_type": "image/png",
        "width": 2048,
        "height": 2048
      }
    ]
  },
  "error": null,
  "cost": {
    "amount_usd": 0.2255,
    "currency": "usd",
    "estimated": false,
    "official_usd": 0.264,
    "saved_usd": 0.0385
  },
  "source": "api",
  "created_at": "2026-10-15T09:21:04Z",
  "started_at": "2026-10-15T09:21:06Z",
  "completed_at": "2026-10-15T09:22:31Z"
}

Get the result

Generations are asynchronous. Poll until status is succeeded, failed or canceled — or pass webhook_url when you submit. Failed generations are refunded automatically.

curl https://cheapergen.com/api/v1/generations/gen_8c2QmX1nq0k4 \
  -H "Authorization: Bearer $CHEAPERGEN_API_KEY"

More: job lifecycle · webhooks · errors

GPT Image 2.5 pricing

Pay per image. No subscription. Failed generations are refunded automatically.

Tier	Official price	Cheaper Gen.	You save
1K · low 1024×1024	~~$0.0074~~/img	$0.0066/img	−11%
2K · low 2048×2048	~~$0.013~~/img	$0.012/img	−12%
1K · medium 1024×1024	~~$0.015~~/img	$0.013/img	−12%
2K · medium 2048×2048	~~$0.029~~/img	$0.025/img	−12%
1K · high 1024×1024	~~$0.055~~/img	$0.048/img	−12%
2K · high 2048×2048	~~$0.109~~/img	$0.096/img	−12%

Official price: OpenAI API list price for gpt-image-2.5-sunburst ($30 / 1M image output tokens, $5 / 1M text input, $8 / 1M image input). Prices verified 2026-10-16.
Per-image figures are for square images and include a typical prompt; each input image adds about $0.016.
xhigh and max quality cost more — see the price in the playground.