Flux Dev

curl -X POST "https://api.runpod.ai/v2/black-forest-labs-flux-1-dev/runsync" \
  -H "Authorization: Bearer $RUNPOD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "input": {
      "prompt": "A serene mountain landscape at sunset, golden light filtering through clouds, photorealistic",
      "negative_prompt": "blurry, low quality",
      "width": 1024,
      "height": 1024,
      "num_inference_steps": 28,
      "guidance": 7.5,
      "seed": 42,
      "image_format": "png"
    }
  }'

import requests

response = requests.post(
    "https://api.runpod.ai/v2/black-forest-labs-flux-1-dev/runsync",
    headers={
        "Authorization": f"Bearer {RUNPOD_API_KEY}",
        "Content-Type": "application/json",
    },
    json={
        "input": {
            "prompt": "A serene mountain landscape at sunset, golden light filtering through clouds, photorealistic",
            "negative_prompt": "blurry, low quality",
            "width": 1024,
            "height": 1024,
            "num_inference_steps": 28,
            "guidance": 7.5,
            "seed": 42,
            "image_format": "png",
        }
    },
)

result = response.json()
print(result["output"]["image_url"])

const response = await fetch(
  "https://api.runpod.ai/v2/black-forest-labs-flux-1-dev/runsync",
  {
    method: "POST",
    headers: {
      "Authorization": `Bearer ${RUNPOD_API_KEY}`,
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      input: {
        prompt: "A serene mountain landscape at sunset, golden light filtering through clouds, photorealistic",
        negative_prompt: "blurry, low quality",
        width: 1024,
        height: 1024,
        num_inference_steps: 28,
        guidance: 7.5,
        seed: 42,
        image_format: "png",
      },
    }),
  }
);

const result = await response.json();
console.log(result.output.image_url);

{
  "id": "sync-a1b2c3d4-e5f6-7890-abcd-ef1234567890-u1",
  "status": "COMPLETED",
  "delayTime": 17,
  "executionTime": 3986,
  "workerId": "oqk7ao1uomckye",
  "output": {
    "image_url": "https://image.runpod.ai/abc123/output.png",
    "cost": 0.02097152
  }
}

{
  "id": "sync-a1b2c3d4-e5f6-7890-abcd-ef1234567890-u1",
  "status": "FAILED",
  "error": "Invalid parameter: width must be divisible by 64"
}

Flux Dev is Black Forest Labs’ flagship image generation model, optimized for high visual fidelity and detailed outputs. It offers exceptional prompt adherence and produces images with rich detail, making it ideal for production use cases.

Try in playground

Test Flux Dev in the Runpod Hub playground.


Endpoint	`https://api.runpod.ai/v2/black-forest-labs-flux-1-dev/runsync`
Pricing	$0.02 per megapixel
Type	Image generation

For faster, cheaper generation during development, consider Flux Schnell which is optimized for speed.

Request

All parameters are passed within the input object in the request body.

string

required

Text description of the desired image. Be specific and detailed for best results.

string

Elements to exclude from the generated image. Use this to prevent unwanted features or styles.

integer

default:"1024"

Image width in pixels. Must be divisible by 64. Range: 256-1536.

integer

default:"1024"

Image height in pixels. Must be divisible by 64. Range: 256-1536.

integer

default:"28"

Number of denoising steps. Higher values produce more detailed images but take longer. Range: 1-50.

float

default:"7.5"

How closely to follow the prompt. Higher values produce images more faithful to the prompt but may reduce creativity. Range: 0.0-10.0.

integer

default:"-1"

Seed for reproducible results. Use the same seed with identical parameters to generate the same image. Set to -1 for random.

string

default:"jpeg"

Output image format. Accepts png or jpeg.

curl -X POST "https://api.runpod.ai/v2/black-forest-labs-flux-1-dev/runsync" \
  -H "Authorization: Bearer $RUNPOD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "input": {
      "prompt": "A serene mountain landscape at sunset, golden light filtering through clouds, photorealistic",
      "negative_prompt": "blurry, low quality",
      "width": 1024,
      "height": 1024,
      "num_inference_steps": 28,
      "guidance": 7.5,
      "seed": 42,
      "image_format": "png"
    }
  }'

import requests

response = requests.post(
    "https://api.runpod.ai/v2/black-forest-labs-flux-1-dev/runsync",
    headers={
        "Authorization": f"Bearer {RUNPOD_API_KEY}",
        "Content-Type": "application/json",
    },
    json={
        "input": {
            "prompt": "A serene mountain landscape at sunset, golden light filtering through clouds, photorealistic",
            "negative_prompt": "blurry, low quality",
            "width": 1024,
            "height": 1024,
            "num_inference_steps": 28,
            "guidance": 7.5,
            "seed": 42,
            "image_format": "png",
        }
    },
)

result = response.json()
print(result["output"]["image_url"])

const response = await fetch(
  "https://api.runpod.ai/v2/black-forest-labs-flux-1-dev/runsync",
  {
    method: "POST",
    headers: {
      "Authorization": `Bearer ${RUNPOD_API_KEY}`,
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      input: {
        prompt: "A serene mountain landscape at sunset, golden light filtering through clouds, photorealistic",
        negative_prompt: "blurry, low quality",
        width: 1024,
        height: 1024,
        num_inference_steps: 28,
        guidance: 7.5,
        seed: 42,
        image_format: "png",
      },
    }),
  }
);

const result = await response.json();
console.log(result.output.image_url);

Response

string

Unique identifier for the request.

string

Request status. Returns COMPLETED on success, FAILED on error.

integer

Time in milliseconds the request spent in queue before processing began.

integer

Time in milliseconds the model took to generate the image.

string

Identifier of the worker that processed the request.

object

The generation result containing the image URL and cost.

string

URL of the generated image. This URL expires after 7 days.

float

Cost of the generation in USD, calculated based on the output megapixels.

{
  "id": "sync-a1b2c3d4-e5f6-7890-abcd-ef1234567890-u1",
  "status": "COMPLETED",
  "delayTime": 17,
  "executionTime": 3986,
  "workerId": "oqk7ao1uomckye",
  "output": {
    "image_url": "https://image.runpod.ai/abc123/output.png",
    "cost": 0.02097152
  }
}

{
  "id": "sync-a1b2c3d4-e5f6-7890-abcd-ef1234567890-u1",
  "status": "FAILED",
  "error": "Invalid parameter: width must be divisible by 64"
}

Image URLs expire after 7 days. Download and store generated images immediately if you need to keep them.

Cost calculation

Flux Dev charges $0.02 per megapixel. Cost is calculated as: (width × height / 1,000,000) × \$0.02.

Image size	Megapixels	Cost
512×512	0.26 MP	$0.0052
1024×1024	1.05 MP	$0.021
1536×1536	2.36 MP	$0.047

Last modified on October 5, 2026

curl -X POST "https://api.runpod.ai/v2/black-forest-labs-flux-1-dev/runsync" \
  -H "Authorization: Bearer $RUNPOD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "input": {
      "prompt": "A serene mountain landscape at sunset, golden light filtering through clouds, photorealistic",
      "negative_prompt": "blurry, low quality",
      "width": 1024,
      "height": 1024,
      "num_inference_steps": 28,
      "guidance": 7.5,
      "seed": 42,
      "image_format": "png"
    }
  }'

import requests

response = requests.post(
    "https://api.runpod.ai/v2/black-forest-labs-flux-1-dev/runsync",
    headers={
        "Authorization": f"Bearer {RUNPOD_API_KEY}",
        "Content-Type": "application/json",
    },
    json={
        "input": {
            "prompt": "A serene mountain landscape at sunset, golden light filtering through clouds, photorealistic",
            "negative_prompt": "blurry, low quality",
            "width": 1024,
            "height": 1024,
            "num_inference_steps": 28,
            "guidance": 7.5,
            "seed": 42,
            "image_format": "png",
        }
    },
)

result = response.json()
print(result["output"]["image_url"])

const response = await fetch(
  "https://api.runpod.ai/v2/black-forest-labs-flux-1-dev/runsync",
  {
    method: "POST",
    headers: {
      "Authorization": `Bearer ${RUNPOD_API_KEY}`,
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      input: {
        prompt: "A serene mountain landscape at sunset, golden light filtering through clouds, photorealistic",
        negative_prompt: "blurry, low quality",
        width: 1024,
        height: 1024,
        num_inference_steps: 28,
        guidance: 7.5,
        seed: 42,
        image_format: "png",
      },
    }),
  }
);

const result = await response.json();
console.log(result.output.image_url);

{
  "id": "sync-a1b2c3d4-e5f6-7890-abcd-ef1234567890-u1",
  "status": "COMPLETED",
  "delayTime": 17,
  "executionTime": 3986,
  "workerId": "oqk7ao1uomckye",
  "output": {
    "image_url": "https://image.runpod.ai/abc123/output.png",
    "cost": 0.02097152
  }
}

{
  "id": "sync-a1b2c3d4-e5f6-7890-abcd-ef1234567890-u1",
  "status": "FAILED",
  "error": "Invalid parameter: width must be divisible by 64"
}

Image models

Video models

Text models

Audio models

Try in playground

Request

Response

Cost calculation