# FLUX.1 [dev] API

> ᡝᠨᡝ ᡠᠯᡥᠠᠨ ᡝᠯᡝᠨ ᠪᡝᠮᡝ ᠪᡠᠶᡝᠨᡳ FLUX ᠵᡠᠯᡝᠨ ᡤᡝᠪᡠᠮᡝ᠂ schnell ᡩᡝ ᠴᡳ ᡠᠯᡥᠠᠨ ᠠᠮᠪᡠᡵᡠ ᠵᡠᠯᡝᠨ ᡩᡝ ᠵᡠᡳ ᠪᡝᠮᠪᡳ᠉

ᡝᠮᡠ ᠵᡠᠯᡝᠨ 12-ᠪᡳᠯᡳᠶᠠᠨ ᡤᡝᠪᡠᠨᡳ FLUX ᡝᠮᡤᡳᠯᡝᠮᡝ ᡤᡝᠯᡝᠮᡝᠨᡳ ᠵᡠᠯᡝᠨ ᠠᠷᠠᠨ ᠪᡳ᠉ 28 ᠠᠯᡳᠨ ᡩᡝ ᠪᡝᠨᡝᡥᡝ᠂ yᠠᠯᡳ 1 ᡩᡝ 50 ᡤᡝᠯᡝᠮᡝ ᠠᠨᡩᠠᠯᠠᠮᡠᠨᡳ ᠪᡳ᠉ ᠵᡠᡤᡡᠨ ᡥᡡᠯᠠᠨ ᡩᡝ ᠠᠨᡩᠠᠯᠠᠮᡝ ᠵᡠᠯᡝᠨ ᡤᡝᠪᡠᠮᠪᡳ᠂ ᠮᡠᡩᠠᠨᡳ᠂ ᠨᡳᠶᠠᠯᠮᠠ ᠠᠮᠪᡠᡴᠠ ᡤᡝᠰᡝᠨ ᡩᡝ ᠵᡠᠯᡝᠨ ᠵᡠᠯᡝᠨ ᡤᡝᠨᡝᠮᠪᡳ᠉ schnell ᡩᡝ ᠴᡳ ᠵᡠᠯᡝᠨ ᠠᠨᡩᠠᠯᠠᠮᡝ ᠪᡝᠮᠪᡳ᠂ ᠮᡠᡴᡝ ᠵᠠᠯᡳᠨᡳ ᠵᡠᠯᡝᠨ ᡤᡝᠰᡝᠨ ᡩᡝ ᠵᡠᠯᡝᠨ ᡥᡡᠯᠠᠮᡝ ᠪᡳ᠉ ᠵᡠᡤᡡᠨ ᡤᡝᠯᡝᠮᡝᠨᡳ ᠵᠠᡳ ᡩᡝ᠂ ᠵᡠᡤᡡᠨ ᠠᠨᡩᠠᠯᠠᠮᡝ ᡤᡝᠪᡠᠮᡝ ᠪᡝᠮᠪᡳ᠉ ᡝᠮᡠ ᡩᡝᠰᡝ ᡩᡝ ᠵᡠᠯᡝᠨ ᡳᠯᡤᠠᠨ ᠠᠮᠪᡠᡴᠠ JPEG ᠠᠮᠪᡠᡴᠠ PNG ᠪᡝᠮᠪᡳ᠉

- Model id: `flux/dev`
- Made by: Black Forest Labs
- Category: Text to Image
- Output: image
- Price: $0.025 / megapixel (cheapest run $0.025 (25 API credits))
- Run: `POST https://api.doitong.com/v1/run/flux/dev`
- Quote: `POST https://api.doitong.com/v1/quote/flux/dev`
- Docs page: https://doitong.com/mnc/developers/models/flux/dev

## Pricing

Price: **$0.025 / megapixel**. Billed per megapixel of output (width × height of every image). Each image is rounded up to a whole megapixel.

The full example input below costs $0.025 = 25 API credits (1 MP × 25 API credits).

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/flux/dev` 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 |  |  | ᡤᠠᠳᠠᠨ ᠪᡠᠶᡝᠮᡝᠨᡳ ᡥᡡᠯᠠᠨ᠉ |
| `image_size` |  | object {width, height} \| enum (string) | no | `landscape_4_3` | `square_hd`, `square`, `portrait_4_3`, `portrait_16_9`, `landscape_4_3`, `landscape_16_9` | ᠪᡠᠶᡝᠮᡝ ᡤᠠᠳᠠᠨ ᡳ ᡤᡳᡵᠠᠨ. |
| `num_inference_steps` |  | integer | no | `28` | 1 – 50 | ᠶᠠᠪᡠᠯᠠᡵᠠ ᡠᠯᡥᡳᠰᡠ ᠪᠣᡩᠣᡵᠣ ᠠᠯᡥᠠ ᡳ ᡨᠣᠨ. |
| `seed` |  | integer \| null | no |  |  | ᡳᠨᠠᠩᡤᠠ ᡤᠠᠳᠠᠨ ᡳ ᡶᡳᠶᠠᠩᡤᠠ ᠪᡠᠶᡝᠮᡝ ᡳ ᡝᠮᡠ ᡝᠨᡝᠩᡤᡳ ᡥᡡᠯᠠᠨ ᡳ ᠰᡝᠮᡝ ᡳᠨᡠ ᡝᠮᡠ ᡤᠠᠳᠠᠨ ᠪᡠᠶᡝᠮᡝ, ᠮᠣᠳᡝᠯᡳ ᡥᡡᠯᠠᠨ ᡳ ᡝᠮᡠ ᠵᠠᠩ ᠪᠠᠶᠠᠨ ᠪᡠᠮᡝ. |
| `guidance_scale` |  | number | no | `3.5` | 1 – 20 | ᡥᡡᠯᠠᠨ ᡩᡝ ᠵᠠᡴᡠᠨ ᠵᡠᠯᡝᠮᡝ ᠤᠯᠠᡥᠠᠨ, CFG (Classifier Free Guidance) ᡩᡝ ᠵᡠᠯᡝᠮᡝ. |
| `num_images` | `num_outputs` | integer | no | `1` | 1 – 4 | ᠪᡠᠶᡝᠮᡝ ᡩᡝ ᠵᡠᠴᡝᠨ ᡳ ᠵᡠᠰᡝ ᡳ ᡩᡠᠯᠠᠨ᠉ |
| `output_format` |  | enum (string) | no | `jpeg` | `jpeg`, `png` | ᠪᡠᠶᡝᠮᡝ ᠵᡠᠴᡝᠨ ᡳ ᡶᡳᠯᡝ ᡳ ᠵᡠᠰᡝ᠉ |
| `acceleration` |  | enum (string) | no | `none` | `none`, `regular`, `high` | ᠪᡠᠶᡝᠮᡝ ᡳ ᡤᡝᠯᡳᠯᡝᠮᡝ, ᡥᡡᠰᡠᠨ ᡳ ᡩᠠᡵᠠᠨ ᠪᡝ ᡤᠠᠯᡤᠠᠨᠠᠮᡝ ᠵᠠᠯᠠᠨ ᠪᡝ ᡥᡡᠰᡠᠨᠠᠮᡝ. |

## Example input

Required parameters only:

```json
{
  "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field, telephoto lens"
}
```

A fuller example:

```json
{
  "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field, telephoto lens",
  "image_size": "landscape_4_3",
  "num_outputs": 1
}
```

## 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/flux/dev?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, telephoto lens",
    "image_size": "landscape_4_3",
    "num_outputs": 1
  }'

# 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/flux/dev?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, telephoto lens",
    "image_size": "landscape_4_3",
    "num_outputs": 1
  }),
});
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, telephoto lens",
    "image_size": "landscape_4_3",
    "num_outputs": 1,
}

# Run the model; wait up to 20 s for the finished result in the same call
r = requests.post(API + "/run/flux/dev", 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": "flux/dev",
      "input": {
        "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field, telephoto lens",
        "image_size": "landscape_4_3",
        "num_outputs": 1
      },
      "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": "flux/dev",
  "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": 25,
    "usd": "0.025",
    "charged": 25,
    "refunded": 0
  },
  "input": {
    "prompt": "A red fox trots through fresh snow at sunrise, soft golden light, shallow depth of field, telephoto lens",
    "image_size": "landscape_4_3",
    "num_outputs": 1
  },
  "output": {
    "images": [
      {
        "url": "https://content.doitong.com/dev-api/2026/10/20/req_8k2m4q7x1z9c3v5b6n0p2r4t/0-output.jpeg",
        "width": 1024,
        "height": 768,
        "content_type": "image/jpeg"
      }
    ],
    "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, width, height, content_type} | ᠪᡠᠶᡝᠮᡝ ᡤᠠᠳᠠᠨᡳ ᡶᡳᠯᡝ ᡩᠠᠮᡠ. |
| `timings` | object |  |
| `seed` | integer | ᠪᡠᠶᡝᠮᡝᠨᡳ ᠰᡝᠨᡩᡝᠨᡳ ᠵᠠᠯᡳᠨ; ᡳᠨᡠ ᠪᡳᠰᡳᡵᡝᠨ ᠪᡝ ᠵᠠᠯᡳᠨᠠᠮᠪᡳ᠉ |
| `has_nsfw_concepts` | array of boolean | ᠪᡠᠶᡝᠮᡝᠨᡳ ᠤᠯᡥᠠᠨ ᠤᠨᠠᠰᡳᠨ ᠩᡝᠮᡝ ᠪᡳ ᠰᡝᠮᡝ ᠵᠠᠯᡳᠨᠠᠮᠪᡳ᠉ |
| `prompt` | string | ᠪᡠᠶᡝᠮᡝᠨᡳ ᡥᡡᠯᠠᠨ᠉ |

## Related models

- [FLUX.1 \[schnell\]](https://doitong.com/developers/models/flux/schnell.md) (`flux/schnell`): $0.003 / megapixel
- [FLUX.1 \[dev\] Redux](https://doitong.com/developers/models/flux/dev/redux.md) (`flux/dev/redux`): $0.025 / megapixel
- [FLUX.1 \[schnell\] Redux](https://doitong.com/developers/models/flux/schnell/redux.md) (`flux/schnell/redux`): $0.025 / megapixel
- [FLUX.1 · Dev · Image to Image](https://doitong.com/developers/models/flux/dev/image-to-image.md) (`flux/dev/image-to-image`): $0.09 / image
- [FLUX.2 \[dev\]](https://doitong.com/developers/models/flux-2.md) (`flux-2`): $0.012 / megapixel
- [FLUX.2 \[pro\]](https://doitong.com/developers/models/flux-2-pro.md) (`flux-2-pro`): $0.015 / megapixel of output image
- [GPT Image 2.5 Text to Image](https://doitong.com/developers/models/openai/gpt-image-2.5/flare/text-to-image.md) (`openai/gpt-image-2.5/flare/text-to-image`): from $0.008 / image
- [Ideogram V4.5](https://doitong.com/developers/models/ideogram/v4.5.md) (`ideogram/v4.5`): from $0.03 / image

## Links

- HTML page: https://doitong.com/developers/models/flux/dev
- 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=flux/dev
- Errors: https://doitong.com/developers/docs/errors
- Model details as JSON: https://api.doitong.com/v1/models/flux/dev