Bytedance Seedream 4.5 sequential images API | Pricing & Docs

bytedance/seedream-4-5/sequential

Generate consistent, photorealistic 4K visuals from text prompts with stable composition, smooth subject retention, and refined multilingual details across sequential frames.

1. Get started

Use RunComfy's API to run bytedance/seedream-4-5/sequential. 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/sequential \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer <token>" \
  --data '{
    "prompt": "Generate 3 images of a beautiful sunset over a calm ocean.",
    "sequential_image_generation_options": 3
  }'

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/sequential \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer <token>" \
  --data '{
    "prompt": "Generate 3 images of a beautiful sunset over a calm ocean.",
    "sequential_image_generation_options": 3
  }'

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",
    "sequential_image_generation_options"
  ],
  "properties": {
    "prompt": {
      "title": "Prompt",
      "description": "The prompt should be less than 600 characters. Your prompt needs to contain the number of images you want to generate. Example: 'Generate 3 images of a beautiful sunset over a calm ocean.'",
      "type": "string",
      "default": "Generate 3 images of a beautiful sunset over a calm ocean."
    },
    "sequential_image_generation_options": {
      "title": "Maximum Number of Output Images",
      "description": "This value must align with the number of images specified in the prompt above. The final price will be calculated based on this value.",
      "type": "integer",
      "enum": [
        1,
        2,
        3,
        4,
        5,
        6,
        7,
        8,
        9,
        10,
        11,
        12,
        13,
        14,
        15
      ],
      "default": 3
    },
    "resolution": {
      "title": "Resolution",
      "description": "For 2K and 4K options, it will let the model determine the width and height. you should describe its aspect ratio, shape, or purpose in the prompt using natural language. For other options, you can choose the width and height you want.",
      "type": "string",
      "enum": [
        "2K",
        "4K",
        "2048x2048 (1:1)",
        "2304x1728 (4:3)",
        "1728x2304 (3:4)",
        "2560x1440 (16:9)",
        "1440x2560 (9:16)",
        "2496x1664 (3:2)",
        "1664x2496 (2:3)",
        "3024x1296 (21:9)",
        "4096x4096 (1:1)"
      ],
      "default": "2048x2048 (1:1)"
    },
    "seed": {
      "title": "Seed",
      "description": "",
      "type": "integer",
      "default": 41722289
    }
  }
}

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 sequential images: text to batch images & Scene Consistency on playground and API | RunComfy