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Step1x Edit2: Region-Precise Text-Guided Image Editing on playground and API | RunComfy

stepfun-ai/stepx-edit2

Transform any image with natural-language edits for identity-true, region-precise results, streamlining product retouching, background replacement, and creative variations through API or browser.

1. Get started

Use RunComfy's API to run stepfun-ai/stepx-edit2. For accepted inputs and outputs, see the model's schema.

curl --request POST \
  --url https://model-api.runcomfy.net/v1/models/stepfun-ai/stepx-edit2 \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer <token>" \
  --data '{
    "prompt": "change background to orange",
    "image_url": "https://playgrounds-storage-public.runcomfy.net/tools/7274/media-files/1-1-input.png"
  }'

2. Authentication

Set the YOUR_API_TOKEN environment variable with your API key (manage keys in your Profile) and include it on every request as a Bearer token via the Authorization header: Authorization: Bearer $YOUR_API_TOKEN.

3. API reference

Submit a request

Submit an asynchronous generation job and immediately receive a request_id plus URLs to check status, fetch results, and cancel.

curl --request POST \
  --url https://model-api.runcomfy.net/v1/models/stepfun-ai/stepx-edit2 \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer <token>" \
  --data '{
    "prompt": "change background to orange",
    "image_url": "https://playgrounds-storage-public.runcomfy.net/tools/7274/media-files/1-1-input.png"
  }'

Monitor request status

Fetch the current state for a request_id ("in_queue", "in_progress", "completed", or "cancelled").

curl --request GET \
  --url https://model-api.runcomfy.net/v1/requests/{request_id}/status \
  --header "Authorization: Bearer <token>"

Retrieve request results

Retrieve the final outputs and metadata for the given request_id; if the job is not complete, the response returns the current state so you can continue polling.

curl --request GET \
  --url https://model-api.runcomfy.net/v1/requests/{request_id}/result \
  --header "Authorization: Bearer <token>"

Cancel a request

Cancel a queued job by request_id, in-progress jobs cannot be cancelled.

curl --request POST \
  --url https://model-api.runcomfy.net/v1/requests/{request_id}/cancel \
  --header "Authorization: Bearer <token>"

4. File inputs

Hosted file (URL)

Provide a publicly reachable HTTPS URL. Ensure the host allows server‑side fetches (no login/cookies required) and isn't rate‑limited or blocking bots. Recommended limits: images ≤ 50 MB (~4K), videos ≤ 100 MB (~2–5 min @ 720p). Prefer stable or pre‑signed URLs for private assets.

5. Schema

Input schema

{
  "type": "object",
  "title": "Input",
  "required": [
    "prompt",
    "image_url"
  ],
  "properties": {
    "prompt": {
      "title": "Prompt",
      "description": "",
      "type": "string",
      "default": "change background to orange"
    },
    "image_url": {
      "title": "Image",
      "description": "",
      "type": "string",
      "default": "https://playgrounds-storage-public.runcomfy.net/tools/7274/media-files/1-1-input.png"
    },
    "negative_prompt": {
      "title": "Negative Prompt",
      "description": "The negative prompt to use. Use it to address details that you don't want in the image. This could be colors, objects, scenery and even the small details (e.g. moustache, blurry, low resolution).",
      "type": "string",
      "default": ""
    },
    "seed": {
      "title": "Seed",
      "description": "",
      "type": "integer",
      "default": 0
    },
    "enable_thinking_mode": {
      "title": "Enable Thinking Mode",
      "description": "Enable thinking mode. Uses multimodal language model knowledge to interpret abstract editing instructions.",
      "type": "boolean",
      "default": true
    },
    "enable_reflection_mode": {
      "title": "Enable Reflection Mode",
      "description": "Enable reflection mode. Reviews outputs, corrects unintended changes, and determines when editing is complete.",
      "type": "boolean",
      "default": true
    },
    "output_format": {
      "title": "Output Format",
      "description": "The format of the generated image.",
      "type": "string",
      "enum": [
        "jpeg",
        "png"
      ],
      "default": "jpeg"
    }
  }
}

Output schema

{
  "output": {
    "type": "object",
    "properties": {
      "image": {
        "type": "string",
        "format": "uri",
        "description": "single image URL"
      },
      "video": {
        "type": "string",
        "format": "uri",
        "description": "single video URL"
      },
      "images": {
        "type": "array",
        "description": "multiple image URLs",
        "items": { "type": "string", "format": "uri" }
      },
      "videos": {
        "type": "array",
        "description": "multiple video URLs",
        "items": { "type": "string", "format": "uri" }
      }
    }
  }
}