# FLUX.3 Klein Image Editing API

> Uređivač FLUX.3 Klein s do 10 referenci i neobaveznim postavljanjem objekata pomoću okvira za ograničavanje

Uređuje ili sastavlja slike iz upita i 1 do 10 referenci u `image_urls`, na koje se upit može pozvati prema redoslijedu, primjerice na prvu sliku. Do 32 vrijednosti `bounding_boxes` mogu zadržati, premjestiti, promijeniti veličinu, ukloniti ili dodati objekte imenovane oznakom u upitu. Proširivanje upita uključeno je prema zadanim postavkama. Vraća 1 do 4 slike u formatu jpeg, png ili 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.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/hr/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 |  |  | Napišite potpuni opis koji opisuje željenu sliku nakon uređivanja i identificira reference prema redoslijedu, primjerice kao prvu ili drugu sliku. |
| `enable_prompt_expansion` |  | boolean | no | `true` |  | Proširivanje prompta u detaljan opis prije generiranja, omogućeno kada je vrijednost true. Pri uređivanju opis se temelji na referentnim slikama. |
| `seed` |  | integer \| null | no |  |  | Seed za ponovljive slike: identični prompt i seed daju identičnu sliku kada je verzija modela nepromijenjena. |
| `num_images` | `num_outputs` | integer | no | `1` | 1 – 4 | Broj slika zatražen za generiranje. |
| `enable_safety_checker` |  | boolean | no | `true` |  | Aktivacija sigurnosne provjere; true omogućuje provjeru. |
| `output_format` |  | enum (string) | no | `png` | `jpeg`, `png`, `webp` | Format datoteke rezultirajuće slike. |
| `image_urls` | `images` | array of image URL | yes |  | 1 – 10 items | Referentne slike korištene za uređivanje ili kompoziciju, najviše 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` | Dimenzije izlaza zadano odgovaraju prvoj referenci, ograničene su na 1 megapiksel za više referenci ili povećane na najviše 4 megapiksela za jednu referencu. Izričite veličine moraju imati svaku stranicu između 256 i 4096 piksela. |
| `bounding_boxes` |  | array of object {label, description, box, source_image_index, source_box, target_box} \| null | no |  | ≤ 32 items | Neobavezni raspored objekata za zadržavanje, premještanje, promjenu veličine ili uklanjanje referentnih objekata te postavljanje novih objekata. Koordinate počinju od (0, 0) u gornjem lijevom kutu svake slike; na okvire se pozivajte oznakama u promptu, primjerice `<dragon>`. |
| `bounding_boxes[].label` |  | string \| null | no |  | ≤ 64 characters | Kratka oznaka objekta za okvir, primjerice `dragon`; zadana vrijednost je `obj_<n>`. U prompt uključite `<dragon>` kako biste njegove riječi povezali s okvirom; okviri koji nisu spomenuti u promptu dodaju se u scenu. |
| `bounding_boxes[].description` |  | string | yes |  | ≤ 500 characters | Objekt koji treba renderirati unutar okvira, uključujući njegov izgled. |
| `bounding_boxes[].box` |  | object {x_min, y_min, x_max, y_max} \| null | no |  |  | Izlazni položaj objekta koji zamjenjuje `source_box`/`target_box` i koristi isto ponašanje pozicioniranja kao text-to-image. |
| `bounding_boxes[].box.x_min` |  | number | yes |  | 0 – 1 | Lijeva granica izražena relativno prema širini slike, od 0 do 1. |
| `bounding_boxes[].box.y_min` |  | number | yes |  | 0 – 1 | Gornja granica izražena relativno prema visini slike, od 0 do 1. |
| `bounding_boxes[].box.x_max` |  | number | yes |  | 0 – 1 | Desna granica izražena relativno prema širini slike, od 0 do 1. |
| `bounding_boxes[].box.y_max` |  | number | yes |  | 0 – 1 | Donja granica izražena relativno prema visini slike, od 0 do 1. |
| `bounding_boxes[].source_image_index` |  | integer \| null | no |  | ≥ 0 | Odabir izvora objekta: izostavite za novi objekt ili odredite postojeću referencu njezinim indeksom u `image_urls`, počevši od 0. |
| `bounding_boxes[].source_box` |  | object {x_min, y_min, x_max, y_max} \| null | no |  |  | Položaj objekta unutar referentne slike; mora biti naveden i `source_image_index`. |
| `bounding_boxes[].source_box.x_min` |  | number | yes |  | 0 – 1 | Lijeva granica izražena relativno prema širini slike, od 0 do 1. |
| `bounding_boxes[].source_box.y_min` |  | number | yes |  | 0 – 1 | Gornja granica izražena relativno prema visini slike, od 0 do 1. |
| `bounding_boxes[].source_box.x_max` |  | number | yes |  | 0 – 1 | Desna granica izražena relativno prema širini slike, od 0 do 1. |
| `bounding_boxes[].source_box.y_max` |  | number | yes |  | 0 – 1 | Donja granica izražena relativno prema visini slike, od 0 do 1. |
| `bounding_boxes[].target_box` |  | object {x_min, y_min, x_max, y_max} \| null | no |  |  | Izlazni okvir položaja objekta: za premještanje ili promjenu veličine potrebna su oba okvira, dok pri uklanjanju referentnog objekta ovaj okvir treba ostaviti nenavedenim. |
| `bounding_boxes[].target_box.x_min` |  | number | yes |  | 0 – 1 | Lijeva granica izražena relativno prema širini slike, od 0 do 1. |
| `bounding_boxes[].target_box.y_min` |  | number | yes |  | 0 – 1 | Gornja granica izražena relativno prema visini slike, od 0 do 1. |
| `bounding_boxes[].target_box.x_max` |  | number | yes |  | 0 – 1 | Desna granica izražena relativno prema širini slike, od 0 do 1. |
| `bounding_boxes[].target_box.y_max` |  | number | yes |  | 0 – 1 | Donja granica izražena relativno prema visini slike, od 0 do 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} | Slike koje je proizveo model. |
| `timings` | object | Vremenski podaci procesa generiranja. |
| `seed` | integer | Seed generiranja za prvu sliku. |
| `has_nsfw_concepts` | array of boolean | Pokazuje pojavljuju li se NSFW koncepti u generiranim slikama. |
| `prompt` | string | Prompt korišten tijekom generiranja slike. |

## 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