Flux Kontext Max Serverless API

FLUX.1 Kontext [max] transforms textual descriptions into stunning, high-fidelity images with seamless typography integration.

~24.41s
POST /v2/flux-kontext-max · 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-max",
 9    seed=30699,
10    prompt="Make her take a selfie in the streets of Freiburg, it's a lovely day out",
11    input_image="https://segmind-resources.s3.amazonaws.com/input/a1adf47e-bfba-45c4-a11f-ae2b732102ad-kontext-max-ip.webp",
12    aspect_ratio="16:9",
13    output_format="png",
14    safety_tolerance=6,
15)
16print(result["status"])                      # COMPLETED
17print(result.get("output"))                  # model output (e.g. media URL)
18print(result["metrics"]["inference_time"])   # server compute seconds
19
20# --- Or submit + poll manually (track request_id, control the cadence) ---
21from segmind import SegmindClient, InferenceFailed, InferenceTimeout
22
23client = SegmindClient()                      # reads SEGMIND_API_KEY
24payload = {
25    "seed": 30699,
26    "prompt": "Make her take a selfie in the streets of Freiburg, it's a lovely day out",
27    "input_image": "https://segmind-resources.s3.amazonaws.com/input/a1adf47e-bfba-45c4-a11f-ae2b732102ad-kontext-max-ip.webp",
28    "aspect_ratio": "16:9",
29    "output_format": "png",
30    "safety_tolerance": 6,
31}
32job = client.submit_async("flux-kontext-max", **payload)
33print(job.request_id)                         # available immediately
34try:
35    result = job.wait(timeout=600, interval=1.0)
36except InferenceTimeout as e:
37    print("still running:", e.request_id)
38except InferenceFailed as e:
39    print("failed:", e.detail)

API Endpoint

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

Parameters

promptrequired
string

Describe what you want to generate. Suggest vibrant scenes for maximum creativity.

aspect_ratiooptional
string

Select the image aspect ratio. Common choices are 16:9 for landscapes or 1:1 for portraits.

Default: "16:9"
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)

Provide a reference image URL. Use high quality images for best guidance.

Default: "https://segmind-resources.s3.amazonaws.com/input/a1adf47e-bfba-45c4-a11f-ae2b732102ad-kontext-max-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

Set a random seed for consistent results. Useful for generating identical outputs in repeated tasks.

Default: 123

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-max

    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