Flux Kontext Pro Serverless API

FLUX.1 Kontext Pro transforms text prompts into high-quality, customized images with remarkable efficiency and precision.

~22.16s
POST /v2/flux-kontext-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-kontext-pro",
 9    prompt="make this a real photograph",
10    input_image="https://segmind-resources.s3.amazonaws.com/input/e9150752-b054-445c-a988-c13c6038dfa9-kontext-pro-ip.webp",
11    aspect_ratio="match_input_image",
12    output_format="png",
13    safety_tolerance=6,
14)
15print(result["status"])                      # COMPLETED
16print(result.get("output"))                  # model output (e.g. media URL)
17print(result["metrics"]["inference_time"])   # server compute seconds
18
19# --- Or submit + poll manually (track request_id, control the cadence) ---
20from segmind import SegmindClient, InferenceFailed, InferenceTimeout
21
22client = SegmindClient()                      # reads SEGMIND_API_KEY
23payload = {
24    "prompt": "make this a real photograph",
25    "input_image": "https://segmind-resources.s3.amazonaws.com/input/e9150752-b054-445c-a988-c13c6038dfa9-kontext-pro-ip.webp",
26    "aspect_ratio": "match_input_image",
27    "output_format": "png",
28    "safety_tolerance": 6,
29}
30job = client.submit_async("flux-kontext-pro", **payload)
31print(job.request_id)                         # available immediately
32try:
33    result = job.wait(timeout=600, interval=1.0)
34except InferenceTimeout as e:
35    print("still running:", e.request_id)
36except InferenceFailed as e:
37    print("failed:", e.detail)

API Endpoint

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

Parameters

promptrequired
string

Describes the desired output or edit. To create lively imagery, try instructions like 'Turn this into a cyberpunk cityscape.'

aspect_ratiooptional
string

Defines the image's width-to-height ratio. Choose '16:9' for widescreen or '1:1' for square images.

Default: "match_input_image"
Allowed values (14 total):
"match_input_image""1:1""16:9""9:16""4:3""3:4""3:2""2:3""4:5""5:4"+4 more
input_imageoptional
string (uri)

Image to edit or guide the generation. Use high-resolution images for the best quality results.

Default: "https://segmind-resources.s3.amazonaws.com/input/e9150752-b054-445c-a988-c13c6038dfa9-kontext-pro-ip.webp"
output_formatoptional
string

Output format for the generated image.

Default: "png"
Allowed values :
"jpg""png"
safety_toleranceoptional
integer

Safety tolerance, 1 is most strict and 6 is most permissive. 2 is currently the maximum allowed when input images are used.

Default: 2
seedoptional
integer

Sets the random seed for generation consistency. Use specific numbers for repeatable results.

Default: null

Response Type

Returns: Image

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-kontext-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