# FLUX.3 Klein Image Editing API

> Editur FLUX.3 Klein b’sa 10 referenzi u tqegħid fakultattiv ta’ oġġetti permezz ta’ bounding box

Jeditja jew jikkomponi immaġnijiet minn prompt u minn 1 sa 10 referenzi f’`image_urls`, li l-prompt jista’ jirreferi għalihom skont l-ordni, bħal “l-ewwel immaġni”. Sa 32 `bounding_boxes` jistgħu jżommu, iċaqilqu, jkabbru, ineħħu jew iżidu oġġetti, imsemmija fil-prompt permezz tat-tikketta. L-espansjoni tal-prompt hija mixgħula b’mod awtomatiku. Jirritorna minn 1 sa 4 immaġnijiet f’jpeg, png jew webp.

- Model id: `blackforestlabs/flux-3/klein/edit-image`
- Made by: Black Forest Labs
- Category: Image Editing
- Output: image
- Price per run: from $0.008 / run of output image (cheapest run $0.008 (8 API credits))
- Run: `POST https://api.doitong.com/v1/run/blackforestlabs/flux-3/klein/edit-image`
- Quote: `POST https://api.doitong.com/v1/quote/blackforestlabs/flux-3/klein/edit-image`
- Docs page: https://doitong.com/mt/developers/models/blackforestlabs/flux-3/klein/edit-image

## Pricing

Price: **from $0.008 / run of output image** (the lowest tier; the quote prices your exact input). Price per run: the input files are measured before the run (length, resolution, frame rate). The quote measures the same files and is exactly what the run charges.

The full example input below costs $0.009 = 9 API credits (1 run × $0.009).

Prices are the upstream price in USD, paid from the API balance in API credits (1000 API credits = 1 USD). `POST https://api.doitong.com/v1/quote/blackforestlabs/flux-3/klein/edit-image` with the same JSON body returns the exact price for that input; the quote is exactly what a run charges. Invalid input is never charged and failed or canceled requests are refunded automatically.

## Input parameters

Send either the canonical name or the native field name (not both). Canonical names are the same across models.

| Parameter | Canonical name | Type | Required | Default | Allowed values / range | Description |
|---|---|---|---|---|---|---|
| `prompt` |  | string | yes |  |  | Ikteb caption sħiħa li tiddeskrivi l-immaġni mixtieqa wara l-editjar, u identifika kwalunkwe referenza skont is-sekwenza, bħall-ewwel jew it-tieni immaġni. |
| `enable_prompt_expansion` |  | boolean | no | `true` |  | Estensjoni tal-prompt f’caption dettaljata qabel il-ġenerazzjoni, attivata meta tkun true. Għall-editjar, il-caption tkun ibbażata fuq l-immaġnijiet ta’ referenza. |
| `seed` |  | integer \| null | no |  |  | Żerriegħa għal immaġnijiet riproduċibbli: prompt u żerriegħa identiċi jipproduċu immaġni identika meta l-verżjoni tal-mudell ma tinbidilx. |
| `num_images` | `num_outputs` | integer | no | `1` | 1 – 4 | Għadd ta’ immaġnijiet mitlub għall-ġenerazzjoni. |
| `enable_safety_checker` |  | boolean | no | `true` |  | Attivazzjoni tal-kontroll tas-sikurezza; true jippermetti l-kontroll. |
| `output_format` |  | enum (string) | no | `png` | `jpeg`, `png`, `webp` | Format tal-fajl għall-immaġni li tirriżulta. |
| `image_urls` | `images` | array of image URL | yes |  | 1 – 10 items | Immaġnijiet ta’ referenza użati għall-editjar jew għall-kompożizzjoni, limitati għal 10. |
| `image_size` |  | object {width, height} \| enum (string) \| null | no |  | `square_hd`, `square`, `portrait_4_3`, `portrait_16_9`, `landscape_4_3`, `landscape_16_9` | Id-dimensjonijiet tal-output ikunu prestabbiliti għal dawk tal-ewwel referenza, b’limitu ta’ 1 megapixel għal referenzi multipli jew skalati għal massimu ta’ 4 megapixel għal referenza waħda. Daqsijiet speċifiċi jrid ikollhom kull naħa bejn 256 u 4096 pixels. |
| `bounding_boxes` |  | array of object {label, description, box, source_image_index, source_box, target_box} \| null | no |  | ≤ 32 items | Layout tal-oġġetti mhux obbligatorju biex iżomm, iċċaqlaq, ibiddel id-daqs jew ineħħi oġġetti ta’ referenza, jew iqiegħed oġġetti ġodda. Il-koordinati jibdew minn (0, 0) fir-rokna ta’ fuq tax-xellug ta’ kull immaġni; irreferi għall-kaxxi billi tuża tikketti fil-prompt, bħal `<dragon>`. |
| `bounding_boxes[].label` |  | string \| null | no |  | ≤ 64 characters | Tikketta qasira tal-oġġett għall-kaxxa, bħal `dragon`; il-valur prestabbilit huwa `obj_<n>`. Inkludi `<dragon>` fil-prompt biex tassoċja kliemu mal-kaxxa; kaxxi li ma jissemmewx fil-prompt jiżdiedu max-xena. |
| `bounding_boxes[].description` |  | string | yes |  | ≤ 500 characters | Oġġett li għandu jiġi rrendut fil-kaxxa, inkluż id-dehra tiegħu. |
| `bounding_boxes[].box` |  | object {x_min, y_min, x_max, y_max} \| null | no |  |  | Tqegħid tal-output għall-oġġett, li jissostitwixxi `source_box`/`target_box` u juża l-istess imġiba ta’ tqegħid bħal text-to-image. |
| `bounding_boxes[].box.x_min` |  | number | yes |  | 0 – 1 | Limitu tax-xellug espress relattivament għall-wisa’ tal-immaġni, minn 0 sa 1. |
| `bounding_boxes[].box.y_min` |  | number | yes |  | 0 – 1 | Limitu ta’ fuq espress relattivament għall-għoli tal-immaġni, minn 0 sa 1. |
| `bounding_boxes[].box.x_max` |  | number | yes |  | 0 – 1 | Limitu tal-lemin espress relattivament għall-wisa’ tal-immaġni, minn 0 sa 1. |
| `bounding_boxes[].box.y_max` |  | number | yes |  | 0 – 1 | Limitu t’isfel espress relattivament għall-għoli tal-immaġni, minn 0 sa 1. |
| `bounding_boxes[].source_image_index` |  | integer \| null | no |  | ≥ 0 | Għażla tas-sors tal-oġġett: ħallih barra għal oġġett ġdid, jew identifika referenza eżistenti bl-indiċi tagħha f’`image_urls`, billi tgħodd minn 0. |
| `bounding_boxes[].source_box` |  | object {x_min, y_min, x_max, y_max} \| null | no |  |  | Post tal-oġġett fl-immaġni ta’ referenza; `source_image_index` irid jiġi pprovdut ukoll. |
| `bounding_boxes[].source_box.x_min` |  | number | yes |  | 0 – 1 | Limitu tax-xellug espress relattivament għall-wisa’ tal-immaġni, minn 0 sa 1. |
| `bounding_boxes[].source_box.y_min` |  | number | yes |  | 0 – 1 | Limitu ta’ fuq espress relattivament għall-għoli tal-immaġni, minn 0 sa 1. |
| `bounding_boxes[].source_box.x_max` |  | number | yes |  | 0 – 1 | Limitu tal-lemin espress relattivament għall-wisa’ tal-immaġni, minn 0 sa 1. |
| `bounding_boxes[].source_box.y_max` |  | number | yes |  | 0 – 1 | Limitu t’isfel espress relattivament għall-għoli tal-immaġni, minn 0 sa 1. |
| `bounding_boxes[].target_box` |  | object {x_min, y_min, x_max, y_max} \| null | no |  |  | Kaxxa tat-tqegħid tal-output għall-oġġett: biex iċċaqlaq jew tibdel id-daqs huma meħtieġa ż-żewġ kaxxi, filwaqt li biex tneħħi oġġett irreferit din il-kaxxa trid titħalla mhux issettjata. |
| `bounding_boxes[].target_box.x_min` |  | number | yes |  | 0 – 1 | Limitu tax-xellug espress relattivament għall-wisa’ tal-immaġni, minn 0 sa 1. |
| `bounding_boxes[].target_box.y_min` |  | number | yes |  | 0 – 1 | Limitu ta’ fuq espress relattivament għall-għoli tal-immaġni, minn 0 sa 1. |
| `bounding_boxes[].target_box.x_max` |  | number | yes |  | 0 – 1 | Limitu tal-lemin espress relattivament għall-wisa’ tal-immaġni, minn 0 sa 1. |
| `bounding_boxes[].target_box.y_max` |  | number | yes |  | 0 – 1 | Limitu t’isfel espress relattivament għall-għoli tal-immaġni, minn 0 sa 1. |

File parameters (`images`) take a public `https://` URL, a `data:` URI up to 10 MB, or the `file_url` of an upload from `POST /files`.

## Example input

Required parameters only:

```json
{
  "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
  "images": [
    "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg"
  ]
}
```

A fuller example:

```json
{
  "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
  "image_urls": [
    "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg"
  ]
}
```

## Run it

Set `DOITONG_API_KEY` to a key from https://doitong.com/developers/dashboard#keys. `?wait=20` returns the finished request in the same call when it is ready within 20 seconds; otherwise poll `GET /requests/{id}` (it also accepts `?wait=`), or pass `webhook_url`.

### curl

```bash
# Run the model; wait up to 20 s for the finished result in the same call
curl -X POST "https://api.doitong.com/v1/run/blackforestlabs/flux-3/klein/edit-image?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
    "image_urls": [
      "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg"
    ]
  }'

# Still "queued" or "running"? Poll with the id from the response:
curl "https://api.doitong.com/v1/requests/REQUEST_ID?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY"
```

### JavaScript

```javascript
const API = "https://api.doitong.com/v1";
const headers = {
  "Authorization": "Bearer " + process.env.DOITONG_API_KEY,
  "Content-Type": "application/json",
};

// Run the model; wait up to 20 s for the finished result in the same call
let res = await fetch(API + "/run/blackforestlabs/flux-3/klein/edit-image?wait=20", {
  method: "POST",
  headers,
  body: JSON.stringify({
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
    "image_urls": [
      "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg"
    ]
  }),
});
let request = await res.json();
if (!res.ok) throw new Error(request.error.code + ": " + request.error.message);

// Not finished yet: long-poll until it is
while (request.status === "queued" || request.status === "running") {
  res = await fetch(API + "/requests/" + request.id + "?wait=20", { headers });
  request = await res.json();
}
if (request.status !== "succeeded") throw new Error(JSON.stringify(request.error));
console.log(request.outputs.map((o) => o.url), request.cost.credits + " API credits ($" + request.cost.usd + ")");
```

### Python

```python
import os
import requests

API = "https://api.doitong.com/v1"
headers = {"Authorization": "Bearer " + os.environ["DOITONG_API_KEY"]}

payload = {
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
    "image_urls": [
        "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg",
    ],
}

# Run the model; wait up to 20 s for the finished result in the same call
r = requests.post(API + "/run/blackforestlabs/flux-3/klein/edit-image", params={"wait": 20}, json=payload, headers=headers)
request = r.json()
if not r.ok:
    raise RuntimeError(request["error"]["code"] + ": " + request["error"]["message"])

# Not finished yet: long-poll until it is
while request["status"] in ("queued", "running"):
    request = requests.get(API + "/requests/" + request["id"], params={"wait": 20}, headers=headers).json()
if request["status"] != "succeeded":
    raise RuntimeError(request["error"])
print([o["url"] for o in request["outputs"]], request["cost"]["credits"], "API credits", "$" + request["cost"]["usd"])
```

### MCP

The MCP server at `https://api.doitong.com/v1/mcp` exposes the tools `search_models`, `get_model`, `quote`, `run`, `get_request`, `cancel_request`, `list_requests`, `create_upload` and `get_account`. A `run` call for this model:

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "run",
    "arguments": {
      "model_id": "blackforestlabs/flux-3/klein/edit-image",
      "input": {
        "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
        "image_urls": [
          "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg"
        ]
      },
      "wait_seconds": 20
    }
  }
}
```

## Response

Every call returns a request object. `status` is one of `queued`, `running`, `succeeded`, `failed`, `canceled`. `outputs` lists the generated files with URLs on our storage (kept forever, or 7 days with `?storage=temporary`; `storage` says which); `output` is the model's own result object with the same URLs.

```json
{
  "id": "req_8k2m4q7x1z9c3v5b6n0p2r4t",
  "object": "request",
  "model": "blackforestlabs/flux-3/klein/edit-image",
  "status": "succeeded",
  "created_at": "2026-10-20T12:00:00Z",
  "started_at": "2026-10-20T12:00:02Z",
  "completed_at": "2026-10-20T12:00:09Z",
  "queue_position": null,
  "cost": {
    "credits": 9,
    "usd": "0.009",
    "charged": 9,
    "refunded": 0
  },
  "input": {
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field",
    "image_urls": [
      "https://content.doitong.com/images/showcase/v3/gen_fox_cartoon.jpg"
    ]
  },
  "output": {
    "images": [
      {
        "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.jpeg",
        "content_type": "image/jpeg",
        "file_name": "0-output.jpeg",
        "file_size": 1843200,
        "width": 1024,
        "height": 768
      }
    ],
    "timings": {},
    "seed": 42,
    "has_nsfw_concepts": [
      false
    ],
    "prompt": "string"
  },
  "outputs": [
    {
      "type": "image",
      "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.jpeg",
      "content_type": "image/jpeg",
      "file_size": 1843200,
      "width": 1024,
      "height": 768,
      "stored": true
    }
  ],
  "error": null,
  "metrics": {
    "inference_seconds": 6.8
  },
  "urls": {
    "self": "https://api.doitong.com/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t",
    "cancel": "https://api.doitong.com/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t/cancel"
  }
}
```

### Output fields (`output`)

| Field | Type | Description |
|---|---|---|
| `images` | array of object {url, content_type, file_name, file_size, width, height} | Immaġnijiet prodotti mill-mudell. |
| `timings` | object | Informazzjoni dwar il-ħin tal-proċess tal-ġenerazzjoni. |
| `seed` | integer | Żerriegħa tal-ġenerazzjoni għall-ewwel immaġni. |
| `has_nsfw_concepts` | array of boolean | Jindika jekk kunċetti NSFW jidhrux fl-immaġnijiet ġġenerati. |
| `prompt` | string | Prompt użat waqt il-ġenerazzjoni tal-immaġni. |

## Related models

- [FLUX.3 Klein](https://doitong.com/developers/models/blackforestlabs/flux-3/klein/text-to-image.md) (`blackforestlabs/flux-3/klein/text-to-image`): from $0.008 / run of output image
- [FLUX.1 Kontext \[pro\]](https://doitong.com/developers/models/flux-pro/kontext.md) (`flux-pro/kontext`): $0.04 / image
- [GPT Image 2.5 Edit](https://doitong.com/developers/models/openai/gpt-image-2.5/flare/edit.md) (`openai/gpt-image-2.5/flare/edit`): from $0.12 / image
- [Nano Banana 2 Edit](https://doitong.com/developers/models/nano-banana-2/edit.md) (`nano-banana-2/edit`): from $0.06 / image
- [Nano Banana Pro Edit](https://doitong.com/developers/models/nano-banana-pro/edit.md) (`nano-banana-pro/edit`): from $0.15 / image
- [Qwen Image 3 Edit](https://doitong.com/developers/models/alibaba/qwen-image-3/edit.md) (`alibaba/qwen-image-3/edit`): from $0.04 / image
- [Seedream 5.0 Pro Edit](https://doitong.com/developers/models/bytedance/seedream/v5/pro/edit.md) (`bytedance/seedream/v5/pro/edit`): from $0.0675 / run of output image
- [FLUX 2 Edit](https://doitong.com/developers/models/flux-2/edit.md) (`flux-2/edit`): $0.012 / megapixel

## Links

- HTML page: https://doitong.com/developers/models/blackforestlabs/flux-3/klein/edit-image
- All models and guides for AI agents: https://doitong.com/developers/llms.txt
- OpenAPI 3.1 with this model's typed request body: https://doitong.com/developers/openapi.json?model=blackforestlabs/flux-3/klein/edit-image
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.com/v1/models/blackforestlabs/flux-3/klein/edit-image