# FLUX.3 Klein Image Editing API

> FLUX.3 Klein-Editor mat bis zu 10 Referenzen an optionaler Objektplazéierung mat Begrenzungsbox

Ännert oder kombinéiert Biller aus engem Prompt an 1 bis 10 Referenzen an `image_urls`, op déi de Prompt no hirer Reiefolleg verweise kann, zum Beispill op dat éischt Bild. Bis zu 32 `bounding_boxes` kënnen Objeten halen, réckelen, vergréisseren, ewechhuelen oder dobäisetzen; am Prompt gi se iwwer hiren Label benannt. Prompt-Erweiderung ass standardméisseg aktiv. Et ginn 1 bis 4 Biller a jpeg, png oder webp zréckginn.

- 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.ru/v1/run/blackforestlabs/flux-3/klein/edit-image`
- Quote: `POST https://api.doitong.ru/v1/quote/blackforestlabs/flux-3/klein/edit-image`
- Docs page: https://doitong.com/lb/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.ru/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 |  |  | Schreift eng komplett Caption, déi dat gewënschte Bild nom Ännere beschreift, a identifizéiert Referenzen no hirer Reiefolleg, wéi dat éischt oder zweet Bild. |
| `enable_prompt_expansion` |  | boolean | no | `true` |  | Prompt-Erweiderung zu enger detailléierter Caption virun der Generatioun, aktivéiert wann true. Beim Ännere baséiert d'Caption op de Referenzbiller. |
| `seed` |  | integer \| null | no |  |  | Seed fir reproduzéierbar Biller: Dee selwechte Prompt a Seed produzéieren datselwecht Bild, wann d'Modellversioun onverännert ass. |
| `num_images` | `num_outputs` | integer | no | `1` | 1 – 4 | Ugefrote Bildzuel fir d'Generatioun. |
| `enable_safety_checker` |  | boolean | no | `true` |  | Aktivéierung vun der Sécherheetskontroll; true aktivéiert d'Kontroll. |
| `output_format` |  | enum (string) | no | `png` | `jpeg`, `png`, `webp` | Dateiformat vum resultéierende Bild. |
| `image_urls` | `images` | array of image URL | yes |  | 1 – 10 items | Referenzbiller fir Ännerung oder Kompositioun, limitéiert op 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` | D'Output-Dimensioune si standardméisseg déi vum éischte Referenzbild, limitéiert op 1 Megapixel bei verschiddene Referenzen oder op maximal 4 Megapixel skaléiert bei enger eenzeger Referenz. Explizit Gréisste mussen op all Säit tëscht 256 an 4096 Pixel leien. |
| `bounding_boxes` |  | array of object {label, description, box, source_image_index, source_box, target_box} \| null | no |  | ≤ 32 items | Optional Objektlayout fir Referenzobjekter ze behalen, ze beweegen, ze redimensionéieren oder ze läschen, oder nei Objeten ze placéieren. Koordinate fänken an der ieweschter lénkser Ecke vun all Bild bei (0, 0) un; referenzéiert Këschte mat Etiketten am Prompt, wéi `<dragon>`. |
| `bounding_boxes[].label` |  | string \| null | no |  | ≤ 64 characters | Kuerzt Objektetikett fir d'Këscht, wéi `dragon`; de Standard ass `obj_<n>`. Maacht `<dragon>` an de Prompt, fir seng Wierder mat der Këscht ze verbannen; Këschten, déi net am Prompt ernimmt ginn, ginn der Szen bäigefüügt. |
| `bounding_boxes[].description` |  | string | yes |  | ≤ 500 characters | Objekt, dat an der Këscht gerendert gëtt, inklusiv sengem Ausgesinn. |
| `bounding_boxes[].box` |  | object {x_min, y_min, x_max, y_max} \| null | no |  |  | Output-Plazéierung vum Objekt, déi `source_box`/`target_box` ersetzt an datselwecht Plazéierungsverhale wéi text-to-image benotzt. |
| `bounding_boxes[].box.x_min` |  | number | yes |  | 0 – 1 | Lénks Grenz relativ zur Bildbreet, vun 0 bis 1. |
| `bounding_boxes[].box.y_min` |  | number | yes |  | 0 – 1 | Uewescht Grenz relativ zur Bildhéicht, vun 0 bis 1. |
| `bounding_boxes[].box.x_max` |  | number | yes |  | 0 – 1 | Riets Grenz relativ zur Bildbreet, vun 0 bis 1. |
| `bounding_boxes[].box.y_max` |  | number | yes |  | 0 – 1 | Ënnescht Grenz relativ zur Bildhéicht, vun 0 bis 1. |
| `bounding_boxes[].source_image_index` |  | integer \| null | no |  | ≥ 0 | Auswiel vun der Objektquell: ewechloossen fir en neit Objekt oder eng bestoend Referenz duerch hiren Index an `image_urls` identifizéieren, gezielt vun 0 un. |
| `bounding_boxes[].source_box` |  | object {x_min, y_min, x_max, y_max} \| null | no |  |  | Plaz vum Objekt am Referenzbild; `source_image_index` muss och uginn ginn. |
| `bounding_boxes[].source_box.x_min` |  | number | yes |  | 0 – 1 | Lénks Grenz relativ zur Bildbreet, vun 0 bis 1. |
| `bounding_boxes[].source_box.y_min` |  | number | yes |  | 0 – 1 | Uewescht Grenz relativ zur Bildhéicht, vun 0 bis 1. |
| `bounding_boxes[].source_box.x_max` |  | number | yes |  | 0 – 1 | Riets Grenz relativ zur Bildbreet, vun 0 bis 1. |
| `bounding_boxes[].source_box.y_max` |  | number | yes |  | 0 – 1 | Ënnescht Grenz relativ zur Bildhéicht, vun 0 bis 1. |
| `bounding_boxes[].target_box` |  | object {x_min, y_min, x_max, y_max} \| null | no |  |  | Output-Plazéierungskëscht fir d'Objekt: Beweegen oder Redimensionéiere verlaangt béid Këschten; fir e referenzéierten Objet ze läschen, dës Këscht eidel loossen. |
| `bounding_boxes[].target_box.x_min` |  | number | yes |  | 0 – 1 | Lénks Grenz relativ zur Bildbreet, vun 0 bis 1. |
| `bounding_boxes[].target_box.y_min` |  | number | yes |  | 0 – 1 | Uewescht Grenz relativ zur Bildhéicht, vun 0 bis 1. |
| `bounding_boxes[].target_box.x_max` |  | number | yes |  | 0 – 1 | Riets Grenz relativ zur Bildbreet, vun 0 bis 1. |
| `bounding_boxes[].target_box.y_max` |  | number | yes |  | 0 – 1 | Ënnescht Grenz relativ zur Bildhéicht, vun 0 bis 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.ru/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.ru/v1/requests/REQUEST_ID?wait=20" \
  -H "Authorization: Bearer $DOITONG_API_KEY"
```

### JavaScript

```javascript
const API = "https://api.doitong.ru/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.ru/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.ru/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.ru/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t",
    "cancel": "https://api.doitong.ru/v1/requests/req_8k2m4q7x1z9c3v5b6n0p2r4t/cancel"
  }
}
```

### Output fields (`output`)

| Field | Type | Description |
|---|---|---|
| `images` | array of object {url, content_type, file_name, file_size, width, height} | Biller, déi vum Modell erstallt goufen. |
| `timings` | object | Zäitinformatioun fir de Generatiounsprozess. |
| `seed` | integer | Generatiounsseed fir dat éischt Bild. |
| `has_nsfw_concepts` | array of boolean | Gëtt un, ob NSFW-Konzepter an de generéierte Biller optrieden. |
| `prompt` | string | Prompt, deen während der Bild-Generatioun benotzt gëtt. |

## 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.ru/v1/models/blackforestlabs/flux-3/klein/edit-image