Flux.1 Dev Serverless API
Flux Dev is a 12 billion parameter rectified flow transformer capable of generating images from text descriptions
POST /v2/flux-dev · 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-dev",
9 prompt="detailed cinematic dof render of an old dusty detailed CRT monitor on a wooden desk in a dim room with items around, messy dirty room. On the screen are the letters “FLUX dev” glowing softly. High detail hard surface render",
10 samples=1,
11 guidance=3.5,
12 steps=25,
13 prompt_strength=0.8,
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": "detailed cinematic dof render of an old dusty detailed CRT monitor on a wooden desk in a dim room with items around, messy dirty room. On the screen are the letters “FLUX dev” glowing softly. High detail hard surface render",
29 "samples": 1,
30 "guidance": 3.5,
31 "steps": 25,
32 "prompt_strength": 0.8,
33 "aspect_ratio": "1:1",
34 "seed": 46588,
35 "output_format": "webp",
36 "output_quality": 80,
37}
38job = client.submit_async("flux-dev", **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) 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-dev",
9 prompt="detailed cinematic dof render of an old dusty detailed CRT monitor on a wooden desk in a dim room with items around, messy dirty room. On the screen are the letters “FLUX dev” glowing softly. High detail hard surface render",
10 samples=1,
11 guidance=3.5,
12 steps=25,
13 prompt_strength=0.8,
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": "detailed cinematic dof render of an old dusty detailed CRT monitor on a wooden desk in a dim room with items around, messy dirty room. On the screen are the letters “FLUX dev” glowing softly. High detail hard surface render",
29 "samples": 1,
30 "guidance": 3.5,
31 "steps": 25,
32 "prompt_strength": 0.8,
33 "aspect_ratio": "1:1",
34 "seed": 46588,
35 "output_format": "webp",
36 "output_quality": 80,
37}
38job = client.submit_async("flux-dev", **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
https://api.segmind.com/v1/flux-devParameters
promptrequiredstringText prompt for image generation
"detailed cinematic dof render of an old dusty detailed CRT monitor on a wooden desk in a dim room with items around, messy dirty room. On the screen are the letters “FLUX dev” glowing softly. High detail hard surface render"aspect_ratiooptionalstringType of scheduler.
"""1:1""16:9""21:9""2:3""3:2""4:5""5:4""9:16""9:21"guidanceoptionalintegerguidance
3Range: 0 - 10output_formatoptionalstringAn enumeration.
"webp""webp""jpg""png"output_qualityoptionalintegerQuality when saving the output images, from 0 to 100. 100 is best quality, 0 is lowest quality. Not relevant for .png outputs
80Range: 0 - 100prompt_strengthoptionalnumberPrompt Strength
0.8Range: 0 - 1samplesoptionalintegerNumber of samples to generate.
1Range: 1 - 4seedoptionalintegerSeed for random number generation
46588stepsoptionalintegernumber of steps
25Range: 1 - 50Response 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
POST /v2/flux-devSubmit — returns request_id, status_url, response_url
- 2
GET /v2/requests/{id}/statusPoll — until COMPLETED or FAILED
- 3
GET /v2/requests/{id}Result — final response body
Status states
- 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.
Bad Request
Invalid parameters or request format
Unauthorized
Missing or invalid API key
Forbidden
Insufficient permissions
Not Found
Model or endpoint not found
Insufficient Credits
Not enough credits to process request
Rate Limited
Too many requests
Server Error
Internal server error
Bad Gateway
Service temporarily unavailable
Timeout
Request timed out