FLUX 3 Image Edit Serverless API

Pixel-perfect image editing and multi-reference compositing, up to 4K.

PlaygroundAPI
Pricing
~77.47s
POST /v2/flux-3-image-edit · 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-image-edit",
 9    images=["https://segmind-resources.s3.amazonaws.com/input/flux-3-image-edit-garage-src-6af504cd.jpg"],
10    prompt="Recolour only the motorcycle's fuel tank from cherry red to brushed copper. Keep the chrome, the tyres, the pegboard of hand tools, the brick wall and the lighting exactly unchanged.",
11    resolution="1k",
12    aspect_ratio="auto",
13    safety_tolerance=2,
14    grounding=True,
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    "images": ["https://segmind-resources.s3.amazonaws.com/input/flux-3-image-edit-garage-src-6af504cd.jpg"],
26    "prompt": "Recolour only the motorcycle's fuel tank from cherry red to brushed copper. Keep the chrome, the tyres, the pegboard of hand tools, the brick wall and the lighting exactly unchanged.",
27    "resolution": "1k",
28    "aspect_ratio": "auto",
29    "safety_tolerance": 2,
30    "grounding": True,
31}
32job = client.submit_async("flux-3-image-edit", **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-3-image-edit

Parameters

imagesrequired
string[]

1 to 10 images to edit, restyle or combine. Refer to them in the prompt as Image 1, Image 2 or <ref_image_0>, <ref_image_1>. URL or base64.

Default: ["https://segmind-resources.s3.amazonaws.com/input/flux-3-image-edit-garage-src-6af504cd.jpg"]
promptrequired
string

What to change and what must stay the same. Supports bounding boxes: 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}.

Default: "Recolour only the motorcycle's fuel tank from cherry red to brushed copper. Keep the chrome, the tyres, the pegboard of hand tools, the brick wall and the lighting exactly unchanged."
aspect_ratiooptional
string

auto keeps the first reference image's framing unless the prompt asks for a ratio.

Default: "auto"
Allowed values (16 total):
"auto""21:9""2:1""16:9""3:2""7:5""4:3""5:4""1:1""4:5"+6 more
groundingoptional
boolean

Let the model ground the prompt in web and image search (real places, products, people in the news). Off for pure imagination.

Default: true
resolutionoptional
string

Output size tier (equal pixel area; exact dimensions follow the aspect ratio). Price scales with the tier.

Default: "1k"
Allowed values :
768sq (768 x 768)→"768sq"
1k (about 1 MP)→"1k"
1.5k (about 2.3 MP)→"1.5k"
2k (about 4 MP)→"2k"
4k (about 16 MP)→"4k"
safety_toleranceoptional
integer

Input and output moderation level: 0 is strictest, 4 most permissive.

Default: 2Range: 0 - 4

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-3-image-edit

    Submit — returns request_id, status_url, response_url

  2. 2
    GET /v2/requests/{id}/status

    Poll — until COMPLETED or FAILED

  3. 3
    GET /v2/requests/{id}

    Result — final response body

Status states

QUEUED— Accepted, waiting for a worker
PROCESSING— Running on a worker
COMPLETED— Done — result body is ready
FAILED— Errored (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