FLUX.1 [dev]

IMAGEFeaturedbfl-flux-1-dev

FLUX.1 [dev] is a powerful, open-weight 12 billion parameter rectified flow transformer from Black Forest Labs suitable for commercial use on Layer. It is designed for artists, researchers, and developers, offering cutting-edge image quality and competitive prompt adherence that rivals closed-source alternatives. Because it’s trained using guidance distillation, this model provides an efficient foundation for creative workflows and scientific exploration in the AI art space.

POST

/v2/workspaces/{workspace_id}/base-models/bfl-flux-1-dev/inferences

curl --request POST \
  --url https://api.app.layer.ai/api/v2/workspaces/:workspace_id/base-models/bfl-flux-1-dev/inferences \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "prompt": "a knight standing in a snowy forest",
  "aspect_ratio": "SQUARE_1K",
  "quality": "HIGH",
  "transparency": false,
  "tileability": false,
  "guidance_file_init_image": [
    {
      "url": "<file_url>"
    }
  ]
}'

import requests

url = "https://api.app.layer.ai/api/v2/workspaces/:workspace_id/base-models/bfl-flux-1-dev/inferences"

payload = {
    "prompt": "a knight standing in a snowy forest",
    "aspect_ratio": "SQUARE_1K",
    "quality": "HIGH",
    "transparency": False,
    "tileability": False,
    "guidance_file_init_image": [{ "url": "<file_url>" }]
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.json())

const url = 'https://api.app.layer.ai/api/v2/workspaces/:workspace_id/base-models/bfl-flux-1-dev/inferences';
const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: '{"prompt":"a knight standing in a snowy forest","aspect_ratio":"SQUARE_1K","quality":"HIGH","transparency":false,"tileability":false,"guidance_file_init_image":[{"url":"<file_url>"}]}'
};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}

package main

import (
  "fmt"
  "strings"
  "net/http"
  "io"
)

func main() {

  url := "https://api.app.layer.ai/api/v2/workspaces/:workspace_id/base-models/bfl-flux-1-dev/inferences"

  payload := strings.NewReader("{\n  \"prompt\": \"a knight standing in a snowy forest\",\n  \"aspect_ratio\": \"SQUARE_1K\",\n  \"quality\": \"HIGH\",\n  \"transparency\": false,\n  \"tileability\": false,\n  \"guidance_file_init_image\": [\n    {\n      \"url\": \"<file_url>\"\n    }\n  ]\n}")

  req, _ := http.NewRequest("POST", url, payload)

  req.Header.Add("Authorization", "Bearer <token>")
  req.Header.Add("Content-Type", "application/json")

  res, _ := http.DefaultClient.Do(req)

  defer res.Body.Close()
  body, _ := io.ReadAll(res.Body)

  fmt.Println(res)
  fmt.Println(string(body))

}

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.app.layer.ai/api/v2/workspaces/:workspace_id/base-models/bfl-flux-1-dev/inferences",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'prompt' => 'a knight standing in a snowy forest',
    'aspect_ratio' => 'SQUARE_1K',
    'quality' => 'HIGH',
    'transparency' => null,
    'tileability' => null,
    'guidance_file_init_image' => [
        [
                'url' => '<file_url>'
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

OkHttpClient client = new OkHttpClient();

MediaType mediaType = MediaType.parse("application/json");
RequestBody body = RequestBody.create(mediaType, "{\n  \"prompt\": \"a knight standing in a snowy forest\",\n  \"aspect_ratio\": \"SQUARE_1K\",\n  \"quality\": \"HIGH\",\n  \"transparency\": false,\n  \"tileability\": false,\n  \"guidance_file_init_image\": [\n    {\n      \"url\": \"<file_url>\"\n    }\n  ]\n}");
Request request = new Request.Builder()
  .url("https://api.app.layer.ai/api/v2/workspaces/:workspace_id/base-models/bfl-flux-1-dev/inferences")
  .post(body)
  .addHeader("Authorization", "Bearer <token>")
  .addHeader("Content-Type", "application/json")
  .build();

Response response = client.newCall(request).execute();

require 'uri'
require 'net/http'

url = URI("https://api.app.layer.ai/api/v2/workspaces/:workspace_id/base-models/bfl-flux-1-dev/inferences")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"prompt\": \"a knight standing in a snowy forest\",\n  \"aspect_ratio\": \"SQUARE_1K\",\n  \"quality\": \"HIGH\",\n  \"transparency\": false,\n  \"tileability\": false,\n  \"guidance_file_init_image\": [\n    {\n      \"url\": \"<file_url>\"\n    }\n  ]\n}"

response = http.request(request)
puts response.read_body

var client = new RestClient("https://api.app.layer.ai/api/v2/workspaces/:workspace_id/base-models/bfl-flux-1-dev/inferences");
var request = new RestRequest("", Method.Post);
request.AddHeader("Authorization", "Bearer <token>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\n  \"prompt\": \"a knight standing in a snowy forest\",\n  \"aspect_ratio\": \"SQUARE_1K\",\n  \"quality\": \"HIGH\",\n  \"transparency\": false,\n  \"tileability\": false,\n  \"guidance_file_init_image\": [\n    {\n      \"url\": \"<file_url>\"\n    }\n  ]\n}", ParameterType.RequestBody);
var response = client.Execute(request);

Authorizations

bearerAuth

Parameters

Path Parameters

workspace_id

required

Workspace Id

Id of the workspace that owns the resource.

string format: uuid

Id of the workspace that owns the resource.

Query Parameters

session_name

Any of:

string
null

string

Organize this run under a named session. A new session is created if none matches.

Request Body^required

application/json

FLUX.1 [dev]

object

prompt

Prompt

string

negative_prompt

Negative Prompt

Advanced field.

string

aspect_ratio

Aspect Ratio

string

default: SQUARE_1K

Allowed values: SQUARE_1K PORTRAIT_2_3_1K PORTRAIT_3_4_1K PORTRAIT_9_16_1K LANDSCAPE_3_2_1K LANDSCAPE_4_3_1K LANDSCAPE_16_9_1K SQUARE_2K PORTRAIT_2_3_2K PORTRAIT_3_4_2K PORTRAIT_9_16_2K LANDSCAPE_3_2_2K LANDSCAPE_4_3_2K LANDSCAPE_16_9_2K

quality

Quality

string

default: HIGH

Allowed values: LOW MEDIUM HIGH

seed

Seed

Advanced field.

integer

nullable

guidance_scale

Guidance Scale

Advanced field.

number

default: 3.5 >= 1 <= 20 multiple of 0.5

inference_steps

Inference Steps

Advanced field.

integer

default: 28 >= 1 <= 50 multiple of 1

base_shift

Base Shift

Advanced field.

number

default: 0.5 <= 2 multiple of 0.05

max_shift

Max Shift

Advanced field.

number

default: 1.15 <= 2 multiple of 0.05

transparency

Transparent Background

boolean

tileability

Tileable

boolean

guidance_file_init_image

Source image

The image to modify

Array<object>

InferenceFormFileRef

A single guidance/reference file supplied to a reference_image_list field.

The slot’s guidance type is fixed by the field it’s attached to; the caller supplies the file URL and, where the model supports per-file weighting, a weight.

object

url

required

Url

string

weight

Weight

number

nullable

guidance_file_ip_adapter

Image prompt

Transfers the overall look of this image

Advanced field.

Array<object>

InferenceFormFileRef

A single guidance/reference file supplied to a reference_image_list field.

The slot’s guidance type is fixed by the field it’s attached to; the caller supplies the file URL and, where the model supports per-file weighting, a weight.

object

url

required

Url

string

weight

Weight

number

nullable

guidance_file_pose

Pose

Copies the pose in this image

Advanced field.

Array<object>

InferenceFormFileRef

A single guidance/reference file supplied to a reference_image_list field.

The slot’s guidance type is fixed by the field it’s attached to; the caller supplies the file URL and, where the model supports per-file weighting, a weight.

object

url

required

Url

string

weight

Weight

number

nullable

guidance_file_depth

Depth map

Copies the depth layout of this image

Advanced field.

Array<object>

InferenceFormFileRef

A single guidance/reference file supplied to a reference_image_list field.

The slot’s guidance type is fixed by the field it’s attached to; the caller supplies the file URL and, where the model supports per-file weighting, a weight.

object

url

required

Url

string

weight

Weight

number

nullable

guidance_file_canny

Canny edge

Follows the hard edges in this image

Advanced field.

Array<object>

InferenceFormFileRef

A single guidance/reference file supplied to a reference_image_list field.

The slot’s guidance type is fixed by the field it’s attached to; the caller supplies the file URL and, where the model supports per-file weighting, a weight.

object

url

required

Url

string

weight

Weight

number

nullable

guidance_file_softedge_hed

Soft edge

Follows the soft edges in this image

Advanced field.

Array<object>

InferenceFormFileRef

A single guidance/reference file supplied to a reference_image_list field.

The slot’s guidance type is fixed by the field it’s attached to; the caller supplies the file URL and, where the model supports per-file weighting, a weight.

object

url

required

Url

string

weight

Weight

number

nullable

guidance_file_lineart

Line art

Follows the lines in this drawing

Advanced field.

Array<object>

InferenceFormFileRef

A single guidance/reference file supplied to a reference_image_list field.

The slot’s guidance type is fixed by the field it’s attached to; the caller supplies the file URL and, where the model supports per-file weighting, a weight.

object

url

required

Url

string

weight

Weight

number

nullable

prompt_language

Prompt Language

Advanced field.

string

nullable

Example

{
  "prompt": "a knight standing in a snowy forest",
  "aspect_ratio": "SQUARE_1K",
  "quality": "HIGH",
  "transparency": false,
  "tileability": false,
  "guidance_file_init_image": [
    {
      "url": "<file_url>"
    }
  ]
}

Responses

202

Successful Response

application/json

ExecuteForgeOutput

object

inference_id

required

Inference Id

Unique identifier for this forge run.

string format: uuid

status

required

InferenceStatus

Current status: IN_PROGRESS.

string

Allowed values: in_progress complete failed cancelled deleted

estimated_price_creative_units

Any of:

number
null

number

poll_interval_seconds

required

Poll Interval Seconds

Suggested polling interval in seconds.

integer

created_at

required

Created At

Timestamp of when the run was created.

string format: date-time

session_id

Any of:

string
null

string format: uuid

normalized_parameters

Any of:

NormalizedInferenceParameters
null

NormalizedInferenceParameters

Inference parameters after model-specific normalization.

These reflect the actual values used for generation, including model defaults applied for any parameters not explicitly set.

object

width

Any of:

integer
null

integer

height

Any of:

integer
null

integer

batch_size

Any of:

integer
null

integer

num_inference_steps

Any of:

integer
null

integer

guidance_scale

Any of:

number
null

number

duration_seconds

Any of:

number
null

number

fps

Any of:

integer
null

integer

Example

{
  "status": "in_progress"
}

401

Unauthenticated — missing or invalid Bearer token.

application/problem+json

object

type

required

string

title

required

string

status

required

integer

detail

required

string

Example

{
  "type": "https://api.layer.ai/errors/ERROR_CODE",
  "title": "Error Title",
  "status": 400,
  "detail": "Human-readable description."
}

403

Forbidden — insufficient permissions.

application/problem+json

object

type

required

string

title

required

string

status

required

integer

detail

required

string

Example

{
  "type": "https://api.layer.ai/errors/ERROR_CODE",
  "title": "Error Title",
  "status": 400,
  "detail": "Human-readable description."
}

404

Resource not found.

application/problem+json

object

type

required

string

title

required

string

status

required

integer

detail

required

string

Example

{
  "type": "https://api.layer.ai/errors/ERROR_CODE",
  "title": "Error Title",
  "status": 400,
  "detail": "Human-readable description."
}

422

Invalid input parameters.

application/problem+json

object

type

required

string

title

required

string

status

required

integer

detail

required

string

Example

{
  "type": "https://api.layer.ai/errors/ERROR_CODE",
  "title": "Error Title",
  "status": 400,
  "detail": "Human-readable description."
}

429

Rate limited — too many concurrent requests.

application/problem+json

object

type

required

string

title

required

string

status

required

integer

detail

required

string

Example

{
  "type": "https://api.layer.ai/errors/ERROR_CODE",
  "title": "Error Title",
  "status": 400,
  "detail": "Human-readable description."
}

500

Internal server error.

application/problem+json

object

type

required

string

title

required

string

status

required

integer

detail

required

string

Example

{
  "type": "https://api.layer.ai/errors/ERROR_CODE",
  "title": "Error Title",
  "status": 400,
  "detail": "Human-readable description."
}

FLUX.1 [dev]

Authorizations

Parameters

Path Parameters

Query Parameters

Request Bodyrequired

Example

Responses

202

Example

401

Example

403

Example

404

Example

422

Example

429

Example

500

Example

Request Body^required