Smart Segmentation

Segment a requested subject from an image using the SAM3 VLM workflow. Returns one or more mask/segmentation outputs from a prompt-guided image analysis pass.

Pricing: $0.12/request. Endpoint: POST /v1/models/runflow/smart-segmentation/runs.

Segment a requested subject from an image using the SAM3 VLM workflow. Returns one or more mask/segmentation outputs from a prompt-guided image analysis pass.

Overview

• Endpoint: https://api.runflow.io/v1/models/runflow/smart-segmentation/runs
• Model ID: runflow/smart-segmentation
• Provider: Runflow
• License: commercial
• Last Updated: 2026-05-14

Pricing

• Base price: $0.12/request
• Note: Per image - SAM3 segmentation

Smart Segmentation API

Endpoint: POST /v1/models/runflow/smart-segmentation/runs

Run the model

Python

import requests

response = requests.post(
    "https://api.runflow.io/v1/models/runflow/smart-segmentation/runs",
    headers={"Authorization": "Bearer RUNFLOW_API_KEY"},
    json={
        "input": {
            "prompt": "foreground subject",
            "image_url": "https://public.runflow.io/images/models/runflow/product-isolation/examples/1/before.webp"
        },
        "callback_url": "https://your-server.com/webhook"
    },
)

data = response.json()
print(data)

Node.js

const response = await fetch(
  "https://api.runflow.io/v1/models/runflow/smart-segmentation/runs",
  {
    method: "POST",
    headers: {
      "Authorization": "Bearer RUNFLOW_API_KEY",
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
        "input": {
            "prompt": "foreground subject",
            "image_url": "https://public.runflow.io/images/models/runflow/product-isolation/examples/1/before.webp"
        },
        "callback_url": "https://your-server.com/webhook"
    }),
  }
);

const data = await response.json();
console.log(data);

cURL

curl -X POST https://api.runflow.io/v1/models/runflow/smart-segmentation/runs \
  -H "Authorization: Bearer $RUNFLOW_API_KEY" \
  -H "Content-Type: application/json" \
  --data-binary @- <<'JSON'
{
    "input": {
        "prompt": "foreground subject",
        "image_url": "https://public.runflow.io/images/models/runflow/product-isolation/examples/1/before.webp"
    },
    "callback_url": "https://your-server.com/webhook"
}
JSON

Request parameters

Parameter	Type	Required	Description
input	object	required	Model input parameters. See “Input schema” below.
callback_url	string | null	optional	Webhook URL - POSTed when the run reaches a terminal state.
metadata	object | null	optional	Arbitrary key-value pairs attached to the run.

Input schema

Field	Type	Required	Allowed values	Description
image_url	image	required	Any	URL of the inputs to process - typically a .zip produced by the frontend. bg-brain downloads it to /tmp/inputs/ and unzips with filenames preserved. HTTPS required.
file_input	string	optional	Any	Internal compatibility filename. For normal image_url inputs, bg-brain derives this automatically from the URL via url_to_input_filename; do not expose it in examples or client docs.
prompt	string	required	Any	Subject or region to segment from the image.

Output schema

Field	Type	Description
outputs	json	Array of result items, each with at minimum a url field.
seed	json	Random seed used (null if N/A).
timing	json	Provider timing breakdown (null if not surfaced).
nsfw_detected	json	Provider NSFW flag (null if not surfaced).

Callback payload

When you provide a callback_url, Runflow POSTs to it once the run reaches a terminal state.

Field	Type	Description
event	string	Event type: “run.completed”, “run.failed”, or “run.cancelled”.
run_id	string	The unique identifier of the run.
status	string	Terminal status: “succeeded”, “failed”, or “cancelled”.
output	object | null	The run output. Null if the run failed or was cancelled.
duration_ms	number | null	Total run duration in milliseconds.
created_at	string | null	ISO 8601 timestamp when the run was created.
completed_at	string | null	ISO 8601 timestamp when the run reached terminal state.
metadata	object | null	The metadata object passed at run creation, if any.

• Retries: 3 attempts with exponential backoff (1s, 2s). Retries on 5xx / network errors only.
• Headers: Runflow-Request-Id is always sent. Runflow-Signature is sent if a signing secret is configured.

Additional Resources

• Playground
• API Reference
• Documentation
• OpenAPI

Related

Browse all models

Browse the catalog.

Run lifecycle

Callbacks, polling, statuses.

Callbacks

Handle async results.

Pricing

How requests bill out.