Bytedance Seedream 4.5 API | Pricing & Docs

bytedance/seedream-4-5/edit

Bytedance's Seedream 4.5 Edit model delivers professional 4K image manipulation with enhanced prompt understanding, available instantly via RunComfy's playground and API.

1. Get started

Use RunComfy's API to run bytedance/seedream-4-5/edit. For accepted inputs and outputs, see the model's schema.

curl --request POST \
  --url https://model-api.runcomfy.net/v1/models/bytedance/seedream-4-5/edit \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer <token>" \
  --data '{
    "prompt": "The man is riding a motor cycle on the road"
  }'

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/bytedance/seedream-4-5/edit \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer <token>" \
  --data '{
    "prompt": "The man is riding a motor cycle on the road"
  }'

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_urls"
  ],
  "properties": {
    "prompt": {
      "title": "Prompt",
      "description": "The recommended length is no more than 600 English words. If the prompt is too long, the information may become scattered. The model might ignore details and only concentrate on the main points, resulting in a image with missing elements.",
      "type": "string",
      "default": "The man is riding a motor cycle on the road"
    },
    "images": {
      "title": "Images",
      "description": "Upload 1~14 images. The format must be jpeg or png",
      "type": "array",
      "items": {
        "type": "string",
        "format": "image_uri"
      },
      "validations": [
        {
          "validation_rule": "file_size_mb<",
          "validation_value": 10,
          "validation_error": "File size must be less than 10 MB."
        },
        {
          "validation_rule": "width/height>",
          "validation_value": 0.0625,
          "validation_error": "The aspect ratio range should be 1:16 to 16:1."
        },
        {
          "validation_rule": "width/height<",
          "validation_value": 16,
          "validation_error": "The aspect ratio range should be 1:16 to 16:1."
        },
        {
          "validation_rule": "width_pixels>",
          "validation_value": 14,
          "validation_error": "The uploaded image width and height must exceed 14 pixels."
        },
        {
          "validation_rule": "height_pixels>",
          "validation_value": 14,
          "validation_error": "The uploaded image width and height must exceed 14 pixels."
        }
      ],
      "maxItems": 14,
      "minItems": 1,
      "default": [
        "https://playgrounds-storage-public.runcomfy.net/tools/7250/media-files/input-1-1.png",
        "https://playgrounds-storage-public.runcomfy.net/tools/7250/media-files/input-1-2.png",
        "https://playgrounds-storage-public.runcomfy.net/tools/7250/media-files/input-1-3.png"
      ]
    },
    "resolution": {
      "title": "Resolution",
      "description": "",
      "type": "string",
      "enum": [
        "2048x2048 (1:1)",
        "2304x1728 (4:3)",
        "1728x2304 (3:4)",
        "2560x1440 (16:9)",
        "1440x2560 (9:16)",
        "2496x1664 (3:2)",
        "1664x2496 (2:3)",
        "3024x1296 (21:9)"
      ],
      "default": "2048x2048 (1:1)"
    }
  }
}

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" }
      }
    }
  }
}

Seedream 4.5 Edit Free: Consistent Image-to-Image, Sharp Text and Facial Details on playground and API | RunComfy