FLUX 3 Text to Image Serverless API
Bounding-box layout control, native 4K text-to-image.
POST /v2/flux-3-text-to-image · 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-3-text-to-image",
9 prompt="Top-down flat-lay on a reclaimed-wood workbench, four components arranged in a clean grid with even daylight: a disassembled brass pocket-watch movement <watch>, a tight coil of bright copper wire <wire>, a teal printed circuit board <board>, and a fan of red-handled jeweler's screwdrivers <drivers>, with a small white index card <label> in the centre. [{\"id\": \"watch\", \"bbox\": [60, 60, 470, 470], \"desc\": \"disassembled brass pocket-watch movement with exposed gears\"}, {\"id\": \"wire\", \"bbox\": [60, 530, 470, 940], \"desc\": \"tightly wound coil of bright copper wire\"}, {\"id\": \"board\", \"bbox\": [530, 60, 940, 470], \"desc\": \"teal printed circuit board with silver solder points\"}, {\"id\": \"drivers\", \"bbox\": [530, 530, 940, 940], \"desc\": \"fan of six red-handled jeweler's screwdrivers\"}, {\"id\": \"label\", \"bbox\": [420, 300, 580, 700], \"desc\": \"a small white index card with the handwritten words BENCH KIT No. 3\"}]",
10 resolution="2k",
11 aspect_ratio="1:1",
12 safety_tolerance=2,
13 grounding=False,
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": "Top-down flat-lay on a reclaimed-wood workbench, four components arranged in a clean grid with even daylight: a disassembled brass pocket-watch movement <watch>, a tight coil of bright copper wire <wire>, a teal printed circuit board <board>, and a fan of red-handled jeweler's screwdrivers <drivers>, with a small white index card <label> in the centre. [{\"id\": \"watch\", \"bbox\": [60, 60, 470, 470], \"desc\": \"disassembled brass pocket-watch movement with exposed gears\"}, {\"id\": \"wire\", \"bbox\": [60, 530, 470, 940], \"desc\": \"tightly wound coil of bright copper wire\"}, {\"id\": \"board\", \"bbox\": [530, 60, 940, 470], \"desc\": \"teal printed circuit board with silver solder points\"}, {\"id\": \"drivers\", \"bbox\": [530, 530, 940, 940], \"desc\": \"fan of six red-handled jeweler's screwdrivers\"}, {\"id\": \"label\", \"bbox\": [420, 300, 580, 700], \"desc\": \"a small white index card with the handwritten words BENCH KIT No. 3\"}]",
25 "resolution": "2k",
26 "aspect_ratio": "1:1",
27 "safety_tolerance": 2,
28 "grounding": False,
29}
30job = client.submit_async("flux-3-text-to-image", **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) 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-3-text-to-image",
9 prompt="Top-down flat-lay on a reclaimed-wood workbench, four components arranged in a clean grid with even daylight: a disassembled brass pocket-watch movement <watch>, a tight coil of bright copper wire <wire>, a teal printed circuit board <board>, and a fan of red-handled jeweler's screwdrivers <drivers>, with a small white index card <label> in the centre. [{\"id\": \"watch\", \"bbox\": [60, 60, 470, 470], \"desc\": \"disassembled brass pocket-watch movement with exposed gears\"}, {\"id\": \"wire\", \"bbox\": [60, 530, 470, 940], \"desc\": \"tightly wound coil of bright copper wire\"}, {\"id\": \"board\", \"bbox\": [530, 60, 940, 470], \"desc\": \"teal printed circuit board with silver solder points\"}, {\"id\": \"drivers\", \"bbox\": [530, 530, 940, 940], \"desc\": \"fan of six red-handled jeweler's screwdrivers\"}, {\"id\": \"label\", \"bbox\": [420, 300, 580, 700], \"desc\": \"a small white index card with the handwritten words BENCH KIT No. 3\"}]",
10 resolution="2k",
11 aspect_ratio="1:1",
12 safety_tolerance=2,
13 grounding=False,
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": "Top-down flat-lay on a reclaimed-wood workbench, four components arranged in a clean grid with even daylight: a disassembled brass pocket-watch movement <watch>, a tight coil of bright copper wire <wire>, a teal printed circuit board <board>, and a fan of red-handled jeweler's screwdrivers <drivers>, with a small white index card <label> in the centre. [{\"id\": \"watch\", \"bbox\": [60, 60, 470, 470], \"desc\": \"disassembled brass pocket-watch movement with exposed gears\"}, {\"id\": \"wire\", \"bbox\": [60, 530, 470, 940], \"desc\": \"tightly wound coil of bright copper wire\"}, {\"id\": \"board\", \"bbox\": [530, 60, 940, 470], \"desc\": \"teal printed circuit board with silver solder points\"}, {\"id\": \"drivers\", \"bbox\": [530, 530, 940, 940], \"desc\": \"fan of six red-handled jeweler's screwdrivers\"}, {\"id\": \"label\", \"bbox\": [420, 300, 580, 700], \"desc\": \"a small white index card with the handwritten words BENCH KIT No. 3\"}]",
25 "resolution": "2k",
26 "aspect_ratio": "1:1",
27 "safety_tolerance": 2,
28 "grounding": False,
29}
30job = client.submit_async("flux-3-text-to-image", **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
https://api.segmind.com/v1/flux-3-text-to-imageParameters
promptrequiredstringDescribe subject, composition, lighting and style. Supports bounding-box layouts: tag elements with <id> and append a JSON array of {id, bbox:[y_min,x_min,y_max,x_max] on a 0-1000 grid, desc}.
"Top-down flat-lay on a reclaimed-wood workbench, four components arranged in a clean grid with even daylight: a disassembled brass pocket-watch movement <watch>, a tight coil of bright copper wire <wire>, a teal printed circuit board <board>, and a fan of red-handled jeweler's screwdrivers <drivers>, with a small white index card <label> in the centre. [{\"id\": \"watch\", \"bbox\": [60, 60, 470, 470], \"desc\": \"disassembled brass pocket-watch movement with exposed gears\"}, {\"id\": \"wire\", \"bbox\": [60, 530, 470, 940], \"desc\": \"tightly wound coil of bright copper wire\"}, {\"id\": \"board\", \"bbox\": [530, 60, 940, 470], \"desc\": \"teal printed circuit board with silver solder points\"}, {\"id\": \"drivers\", \"bbox\": [530, 530, 940, 940], \"desc\": \"fan of six red-handled jeweler's screwdrivers\"}, {\"id\": \"label\", \"bbox\": [420, 300, 580, 700], \"desc\": \"a small white index card with the handwritten words BENCH KIT No. 3\"}]"aspect_ratiooptionalstringauto lets the prompt decide, else 1:1. Pick a fixed ratio for a known canvas.
"auto""auto""21:9""2:1""16:9""3:2""7:5""4:3""5:4""1:1""4:5"+6 moregroundingoptionalbooleanLet the model ground the prompt in web and image search (real places, products, people in the news). Off for pure imagination.
trueresolutionoptionalstringOutput size tier (equal pixel area; exact dimensions follow the aspect ratio). Price scales with the tier.
"1k""768sq""1k""1.5k""2k""4k"safety_toleranceoptionalintegerInput and output moderation level: 0 is strictest, 4 most permissive.
2Range: 0 - 4Response 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-3-text-to-imageSubmit — 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