# FLUX.3 Klein Image Editing API

> FLUX.3 Klein editor dži 10 referencenca thaj opcionale bounding-box kontrolasa e objektongo thaneske

Redaktirinel vaj komponirinel kipuya katar jekh prompto thaj 1 dži ko 10 referencije ande `image_urls`, save o prompto šaj te citiril pala o rendo, sar o jekhto kipo. Dži ko 32 `bounding_boxes` šaj te garaven, mikhnen, paruven o baripe, khosen vaj thoven objektya, anavkerde ande o prompto pala o labelo. O barjaripe e promptosko si phandlo standardno. Vrakerel 1 dži ko 4 kipuya ande jpeg, png vaj 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/rom/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 |  |  | Pisindžan pherdo captiono savo vakerel pal o manglo kipo pal o editovanie, thaj sikav referencie paša řada, sar angluno vaj dujto kipo. |
| `enable_prompt_expansion` |  | boolean | no | `true` |  | Prompt-expansion ande detalno captiono anglal e keripe, aktivno kana hin `true`. Ande editovanie, o captiono ľidžal pes paša referencne kipura. |
| `seed` |  | integer \| null | no |  |  | Semeno vaš pale-keriteľne kipura: jekh prompto thaj semeno den jekh kipo kana o modeloski verzia na paruvľa. |
| `num_images` | `num_outputs` | integer | no | `1` | 1 – 4 | Manglo kipoqo gin vaš generiripe. |
| `enable_safety_checker` |  | boolean | no | `true` |  | Safety-checker aktivacia; true aktivarel checking. |
| `output_format` |  | enum (string) | no | `png` | `jpeg`, `png`, `webp` | Fajlo-formato e rezultato kipoqo. |
| `image_urls` | `images` | array of image URL | yes |  | 1 – 10 items | Referencne kipura përdžival ke editovanie vaj kompozicia, limitimen pe 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` | Rezultatoske rozmerura standardnes hin sar e anglune referenciake kiposke; pe but referencie limitimen pe 1 megapiksel vaj pe jekh referencija skalimen ži 4 megapiksel. Explicitne rozmerura kampel te ovel sako rig maškar 256 thaj 4096 pixelura. |
| `bounding_boxes` |  | array of object {label, description, box, source_image_index, source_box, target_box} \| null | no |  | ≤ 32 items | Voliteľno layouto e objektongoro vaš ľikeripe, ľikeripe, bararipen vaj avri-len referencake objektongoro, vaj thodipe ne objektongoro. Koordinate startinen katar (0, 0) ande sako kiposko upruno-baľo konco; te vakeres pal boxura, përdžival labelura ando prompto, sar `<dragon>`. |
| `bounding_boxes[].label` |  | string \| null | no |  | ≤ 64 characters | Krato objektosko label vaš o boxo, sar `dragon`; standardno hin `obj_<n>`. Thov `<dragon>` ando prompto te ľidžal leske lava paša boxo; boxura na vakerde ando prompto aven ande scena. |
| `bounding_boxes[].description` |  | string | yes |  | ≤ 500 characters | Objekto savo te renderinel ando boxo, thaj lesko vzhľad. |
| `bounding_boxes[].box` |  | object {x_min, y_min, x_max, y_max} \| null | no |  |  | Rezultatosko than vaš o objekto, savo zameninel `source_box`/`target_box` thaj ľikerel o jekhno správanie sar text-to-image. |
| `bounding_boxes[].box.x_min` |  | number | yes |  | 0 – 1 | Baľo hranica relative paša kiposki šírka, katar 0 ži 1. |
| `bounding_boxes[].box.y_min` |  | number | yes |  | 0 – 1 | Upruno hranica relative paša kiposki učiľipen, katar 0 ži 1. |
| `bounding_boxes[].box.x_max` |  | number | yes |  | 0 – 1 | Čačo hranica relative paša kiposki šírka, katar 0 ži 1. |
| `bounding_boxes[].box.y_max` |  | number | yes |  | 0 – 1 | Teleutno hranica relative paša kiposki učiľipen, katar 0 ži 1. |
| `bounding_boxes[].source_image_index` |  | integer \| null | no |  | ≥ 0 | Alosaripen e objektoske sourske: mukel prázdno vaš nevo objekto, vaj sikavel eksisterujici referencija leske indexosa ande `image_urls`, ginďa katar 0. |
| `bounding_boxes[].source_box` |  | object {x_min, y_min, x_max, y_max} \| null | no |  |  | Than e objektosko ande referencno kipo; kampel te ovel dino `source_image_index`. |
| `bounding_boxes[].source_box.x_min` |  | number | yes |  | 0 – 1 | Baľo hranica relative paša kiposki šírka, katar 0 ži 1. |
| `bounding_boxes[].source_box.y_min` |  | number | yes |  | 0 – 1 | Upruno hranica relative paša kiposki učiľipen, katar 0 ži 1. |
| `bounding_boxes[].source_box.x_max` |  | number | yes |  | 0 – 1 | Čačo hranica relative paša kiposki šírka, katar 0 ži 1. |
| `bounding_boxes[].source_box.y_max` |  | number | yes |  | 0 – 1 | Teleutno hranica relative paša kiposki učiľipen, katar 0 ži 1. |
| `bounding_boxes[].target_box` |  | object {x_min, y_min, x_max, y_max} \| null | no |  |  | Rezultatosko boxo vaš o objekto: ľikeripe vaj bararipen kamel duj boxura, a vaš avri-len referencake objektosko kampel te avel o boxo na-thodo. |
| `bounding_boxes[].target_box.x_min` |  | number | yes |  | 0 – 1 | Baľo hranica relative paša kiposki šírka, katar 0 ži 1. |
| `bounding_boxes[].target_box.y_min` |  | number | yes |  | 0 – 1 | Upruno hranica relative paša kiposki učiľipen, katar 0 ži 1. |
| `bounding_boxes[].target_box.x_max` |  | number | yes |  | 0 – 1 | Čačo hranica relative paša kiposki šírka, katar 0 ži 1. |
| `bounding_boxes[].target_box.y_max` |  | number | yes |  | 0 – 1 | Teleutno hranica relative paša kiposki učiľipen, katar 0 ži 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} | Kipo kerdine e modeloça. |
| `timings` | object | Časoskeripen vaš e keripnǎki buťi. |
| `seed` | integer | Keripesko semeno vaš angluno kipo. |
| `has_nsfw_concepts` | array of boolean | Sikavel te si NSFW koncepto ande generirime kipo. |
| `prompt` | string | Prompto utilizuime ko kipoqo generiripe. |

## 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