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Flux Kontext Dev is a 12 billion parameter rectified flow transformer capable of editing images based on text instructions. It excels at making targeted edits to existing images while preserving the overall context and style.

Try in playground

Test Flux Kontext Dev in the Runpod Hub playground.
Endpointhttps://api.runpod.ai/v2/black-forest-labs-flux-1-kontext-dev/runsync
Pricing$0.025 per image
TypeImage editing

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Request

All parameters are passed within the input object in the request body.
​
input.prompt
string
required
Text instructions describing the desired edits to the image.
​
input.image
string
required
URL of the input image to edit.
​
input.negative_prompt
string
Elements to exclude from the edited image.
​
input.size
string
default:"1024*1024"
Output image size in format “width*height”.
​
input.num_inference_steps
integer
default:"28"
Number of denoising steps. Higher values produce more detailed edits. Range: 1-50.
​
input.guidance
float
default:"2"
How closely to follow the prompt. Range: 0.0-10.0.
​
input.seed
integer
default:"-1"
Seed for reproducible results. Set to -1 for random.
​
input.output_format
string
default:"png"
Output image format. Accepts png or jpeg.
​
input.enable_safety_checker
boolean
default:"true"
Whether to run safety checks on the output.
curl -X POST "https://api.runpod.ai/v2/black-forest-labs-flux-1-kontext-dev/runsync" \
  -H "Authorization: Bearer $RUNPOD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "input": {
      "prompt": "Exact same bluebird, same angle and posture, now perched on a cloud in outer space",
      "image": "https://example.com/bluebird.png",
      "negative_prompt": "",
      "seed": -1,
      "num_inference_steps": 28,
      "guidance": 2,
      "size": "1024*1024",
      "output_format": "png",
      "enable_safety_checker": true
    }
  }'

​
Response

​
id
string
Unique identifier for the request.
​
status
string
Request status. Returns COMPLETED on success, FAILED on error.
​
delayTime
integer
Time in milliseconds the request spent in queue before processing began.
​
executionTime
integer
Time in milliseconds the model took to edit the image.
​
workerId
string
Identifier of the worker that processed the request.
​
output
object
The generation result containing the image URL and cost.
​
output.image_url
string
URL of the edited image. This URL expires after 7 days.
​
output.cost
float
Cost of the generation in USD, calculated based on the output megapixels.
{
  "id": "sync-a1b2c3d4-e5f6-7890-abcd-ef1234567890-u1",
  "status": "COMPLETED",
  "delayTime": 18,
  "executionTime": 4521,
  "workerId": "oqk7ao1uomckye",
  "output": {
    "image_url": "https://image.runpod.ai/abc123/output.png",
    "cost": 0.031457
  }
}
Image URLs expire after 7 days. Download and store edited images immediately if you need to keep them.

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Cost calculation

Flux Kontext Dev charges $0.025 per image edited.