Juggernaut Pro Flux Serverless API

Juggernaut Pro FLUX: Create stunningly realistic AI images with unprecedented detail and sharpness.

POST /v2/juggernaut-pro-flux · submit + poll
 1# pip install "segmind>=1.1.0"
 2# export SEGMIND_API_KEY="YOUR_API_KEY"
 3import segmind
 4
 5# Async (v2): submit to the queue and block until COMPLETED.
 6# run() returns the final result dict (600s deadline, 1.0s poll by default).
 7result = segmind.run(
 8    "juggernaut-pro-flux",
 9    positivePrompt="Middle-aged man sitting alone at diner counter, 3am, half-eaten pie, reflection in window, fluorescent lighting casting shadows.",
10    width=1024,
11    height=1024,
12    steps=25,
13    seed=1184522,
14    CFGScale=7,
15    outputFormat="JPG",
16    scheduler="Euler",
17)
18print(result["status"])                      # COMPLETED
19print(result.get("output"))                  # model output (e.g. media URL)
20print(result["metrics"]["inference_time"])   # server compute seconds
21
22# --- Or submit + poll manually (track request_id, control the cadence) ---
23from segmind import SegmindClient, InferenceFailed, InferenceTimeout
24
25client = SegmindClient()                      # reads SEGMIND_API_KEY
26payload = {
27    "positivePrompt": "Middle-aged man sitting alone at diner counter, 3am, half-eaten pie, reflection in window, fluorescent lighting casting shadows.",
28    "width": 1024,
29    "height": 1024,
30    "steps": 25,
31    "seed": 1184522,
32    "CFGScale": 7,
33    "outputFormat": "JPG",
34    "scheduler": "Euler",
35}
36job = client.submit_async("juggernaut-pro-flux", **payload)
37print(job.request_id)                         # available immediately
38try:
39    result = job.wait(timeout=600, interval=1.0)
40except InferenceTimeout as e:
41    print("still running:", e.request_id)
42except InferenceFailed as e:
43    print("failed:", e.detail)

API Endpoint

POSThttps://api.segmind.com/v1/juggernaut-pro-flux

Parameters

CFGScalerequired
integer

CFG Scale for the generation process

Default: 7Range: 0 - 30
heightrequired
integer

Height of the generated image

Default: 1024Range: 128 - 2048
outputFormatrequired
string

Specifies the format of the output image. Supported formats are: PNG, JPG and WEBP.

Default: "JPG"
Allowed values :
"JPG""PNG""WEBP"
positivePromptrequired
string

Text prompt for generating the image

Default: "Middle-aged man sitting alone at diner counter, 3am, half-eaten pie, reflection in window, fluorescent lighting casting shadows."
schedulerrequired
string

Scheduler to control the inference process

Default: "Euler"
Allowed values (25 total):
"Euler""FlowMatchEulerDiscreteScheduler""DPM++""DPM++ SDE""DPM++ 2M""DPM++ 2M SDE""DPM++ 3M""Euler Beta""Euler Exponential""Euler Karras"+15 more
stepsrequired
integer

Number of inference steps for image generation

Default: 25Range: 1 - 100
widthrequired
integer

Width of the generated image

Default: 1024Range: 128 - 2048
seedoptional
integer

Seed for random number generation

Default: 1184522

Response Type

Returns: Text/JSON

Asynchronous requests (v2)

Use Async for video, long-running (>~60s), or high-concurrency workloads; Sync is simplest for fast image & LLM calls. Async submits a request and you poll it to completion.

  1. 1
    POST /v2/juggernaut-pro-flux

    Submitreturns request_id, status_url, response_url

  2. 2
    GET /v2/requests/{id}/status

    Polluntil COMPLETED or FAILED

  3. 3
    GET /v2/requests/{id}

    Resultfinal response body

Status states

QUEUEDAccepted, waiting for a worker
PROCESSINGRunning on a worker
COMPLETEDDone — result body is ready
FAILEDErrored (incl. content/RAI blocks)
  • A FAILED request is served as HTTP 422 — the body still carries the error detail.
  • An unknown or expired request_id returns HTTP 404.
  • Results are retained for 1 hour, then expire.
  • Content / RAI blocks surface as FAILED, not a separate state.
  • Track completion by polling the status endpoint.

Common Error Codes

The API returns standard HTTP status codes. Detailed error messages are provided in the response body.

400

Bad Request

Invalid parameters or request format

401

Unauthorized

Missing or invalid API key

403

Forbidden

Insufficient permissions

404

Not Found

Model or endpoint not found

406

Insufficient Credits

Not enough credits to process request

429

Rate Limited

Too many requests

500

Server Error

Internal server error

502

Bad Gateway

Service temporarily unavailable

504

Timeout

Request timed out