Qwen Image Fast Serverless API

Qwen-Image expertly generates stunning images with complex text integration, especially for Chinese typography.

POST /v2/qwen-image-fast · 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    "qwen-image-fast",
 9    prompt="FASHION magazine cover featuring a stunning elegant woman, glamorous confident pose, couture dress, flawless glowing skin, luxury jewelry, cinematic studio lighting, glossy print photography aesthetic, ultra-detailed, crisp focus, only the word FASHION at the top, no other text anywhere",
10    steps=8,
11    seed=-1,
12    guidance=1,
13    aspect_ratio="3:4",
14    image_format="png",
15    quality=90,
16    base64=False,
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    "prompt": "FASHION magazine cover featuring a stunning elegant woman, glamorous confident pose, couture dress, flawless glowing skin, luxury jewelry, cinematic studio lighting, glossy print photography aesthetic, ultra-detailed, crisp focus, only the word FASHION at the top, no other text anywhere",
28    "steps": 8,
29    "seed": -1,
30    "guidance": 1,
31    "aspect_ratio": "3:4",
32    "image_format": "png",
33    "quality": 90,
34    "base64": False,
35}
36job = client.submit_async("qwen-image-fast", **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/qwen-image-fast

Parameters

promptrequired
string

Describe imaginative scenes for image creation.

Default: "A serene lakeside with glowing fireflies under a moonlit sky."
stepsrequired
integer

Number of steps for image refinement. More steps enhance quality; 8-16 is a good range.

Default: 8Range: 1 - 16
aspect_ratiooptional
string

Selects image shape. Use 16:9 for cinematic view, 1:1 for balanced look.

Default: "1:1"
Allowed values :
"1:1""16:9""9:16""4:3""3:4""3:2""2:3"
base64optional
boolean

Outputs as base64 string for embedding. Enable for integration, disable for standalone files.

Default: false
guidanceoptional
number

Sets prompt adherence level. Use 1.0 for creative outcomes, 3.0 for precise results.

Default: 1Range: 1 - 20
image_formatoptional
string

Choose format for image storage. 'jpeg' for compact files, 'png' for clarity.

Default: "png"
Allowed values :
"png""jpeg""webp"
qualityoptional
integer

Sets image detail level. Use 80 for web content, 100 for high-quality prints.

Default: 90Range: 10 - 100
seedoptional
integer

Seed controls image uniqueness. Use -1 for new variations or a fixed number for consistency.

Default: -1

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/qwen-image-fast

    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