Flux .1 Pro Serverless API

Flux Pro is a state-of-the-art image generation with top of the line prompt following, visual quality, image detail and output diversity.

~20.29s
POST /v2/flux-pro · 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    "flux-pro",
 9    prompt="A mesmerizing 4D rendering illustration masterpiece, capturing the name '1 million users congratulations'under in a captivating, dripping, melting style. The bright, bold white letters are illuminated with vivid hues and emit a whimsical, fun movement. The surrounding abstract shapes, splashes, and drops in various bright colors add to the dynamic atmosphere. The pristine white background contrasts with the bold, striking colors of the text and its surroundings, showcasing the artist's exceptional skills in 3D rendering and illustration. The artist's innovative fusion of typography, 3D rendering, and illustration results in an awe-inspiring piece that is visually stunning, transcending the boundaries of painting, 3D rendering, and vibrant typography., 3d render",
10    guidance=3,
11    steps=25,
12    interval=2,
13    safety_tolerance=2,
14    aspect_ratio="1:1",
15    seed=46588,
16    output_format="webp",
17    output_quality=80,
18)
19print(result["status"])                      # COMPLETED
20print(result.get("output"))                  # model output (e.g. media URL)
21print(result["metrics"]["inference_time"])   # server compute seconds
22
23# --- Or submit + poll manually (track request_id, control the cadence) ---
24from segmind import SegmindClient, InferenceFailed, InferenceTimeout
25
26client = SegmindClient()                      # reads SEGMIND_API_KEY
27payload = {
28    "prompt": "A mesmerizing 4D rendering illustration masterpiece, capturing the name '1 million users congratulations'under in a captivating, dripping, melting style. The bright, bold white letters are illuminated with vivid hues and emit a whimsical, fun movement. The surrounding abstract shapes, splashes, and drops in various bright colors add to the dynamic atmosphere. The pristine white background contrasts with the bold, striking colors of the text and its surroundings, showcasing the artist's exceptional skills in 3D rendering and illustration. The artist's innovative fusion of typography, 3D rendering, and illustration results in an awe-inspiring piece that is visually stunning, transcending the boundaries of painting, 3D rendering, and vibrant typography., 3d render",
29    "guidance": 3,
30    "steps": 25,
31    "interval": 2,
32    "safety_tolerance": 2,
33    "aspect_ratio": "1:1",
34    "seed": 46588,
35    "output_format": "webp",
36    "output_quality": 80,
37}
38job = client.submit_async("flux-pro", **payload)
39print(job.request_id)                         # available immediately
40try:
41    result = job.wait(timeout=600, interval=1.0)
42except InferenceTimeout as e:
43    print("still running:", e.request_id)
44except InferenceFailed as e:
45    print("failed:", e.detail)

API Endpoint

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

Parameters

promptrequired
string

Text prompt for image generation

Default: "A mesmerizing 4D rendering illustration masterpiece, capturing the name '1 million users congratulations'under in a captivating, dripping, melting style. The bright, bold white letters are illuminated with vivid hues and emit a whimsical, fun movement. The surrounding abstract shapes, splashes, and drops in various bright colors add to the dynamic atmosphere. The pristine white background contrasts with the bold, striking colors of the text and its surroundings, showcasing the artist's exceptional skills in 3D rendering and illustration. The artist's innovative fusion of typography, 3D rendering, and illustration results in an awe-inspiring piece that is visually stunning, transcending the boundaries of painting, 3D rendering, and vibrant typography., 3d render"
aspect_ratiooptional
string

Type of scheduler.

Default: ""
Allowed values :
"1:1""16:9""21:9""2:3""3:2""4:5""5:4""9:16""9:21"
guidanceoptional
integer

guidance

Default: 3Range: 2 - 5
intervaloptional
integer

interval

Default: 2Range: 1 - 4
output_formatoptional
string

An enumeration.

Default: "webp"
Allowed values :
"webp""jpg""png"
output_qualityoptional
integer

Quality when saving the output images, from 0 to 100. 100 is best quality, 0 is lowest quality. Not relevant for .png outputs

Default: 80Range: 0 - 100
safety_toleranceoptional
integer

safety tolerance

Default: 2Range: 1 - 5
seedoptional
integer

Seed for random number generation

Default: 46588
stepsoptional
integer

number of steps

Default: 25Range: 1 - 50

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/flux-pro

    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