Bytedance Seedance 2.5 First & Last Frame API | Pricing & Docs

bytedance/seedance-2.5/first-last-frame/720p

Seedance 2.5 First & Last Frame 720p bridges a start frame and an end frame into a 4–30-second 720p clip with optional native audio. The output aspect ratio follows your input frames.

1. Get started

Use RunComfy's API to run bytedance/seedance-2.5/first-last-frame/720p. For accepted inputs and outputs, see the model's schema.

curl --request POST \
  --url https://model-api.runcomfy.net/v1/models/bytedance/seedance-2.5/first-last-frame/720p \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer <token>" \
  --data '{
    "prompt": "A cinematic golden-hour safari sequence: the camera glides across the sunlit savanna past a herd of grazing zebras and settles on a majestic lion resting on a rocky outcrop as the sun sinks toward the horizon, warm volumetric light, drifting dust, smooth continuous motion, natural wildlife ambience.",
    "first_frame": "https://playgrounds-storage-public.runcomfy.net/tools/7396/media-files/input-first-1.png",
    "last_frame": "https://playgrounds-storage-public.runcomfy.net/tools/7396/media-files/input-last-1.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/bytedance/seedance-2.5/first-last-frame/720p \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer <token>" \
  --data '{
    "prompt": "A cinematic golden-hour safari sequence: the camera glides across the sunlit savanna past a herd of grazing zebras and settles on a majestic lion resting on a rocky outcrop as the sun sinks toward the horizon, warm volumetric light, drifting dust, smooth continuous motion, natural wildlife ambience.",
    "first_frame": "https://playgrounds-storage-public.runcomfy.net/tools/7396/media-files/input-first-1.png",
    "last_frame": "https://playgrounds-storage-public.runcomfy.net/tools/7396/media-files/input-last-1.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 schema",
  "required": [
    "prompt",
    "first_frame",
    "last_frame"
  ],
  "properties": {
    "prompt": {
      "title": "Prompt",
      "description": "Text prompt describing the transition and motion between the first and last frames.",
      "type": "string",
      "default": "A cinematic golden-hour safari sequence: the camera glides across the sunlit savanna past a herd of grazing zebras and settles on a majestic lion resting on a rocky outcrop as the sun sinks toward the horizon, warm volumetric light, drifting dust, smooth continuous motion, natural wildlife ambience."
    },
    "first_frame": {
      "title": "First Frame Image",
      "description": "Starting keyframe image for the video transition.",
      "type": "string",
      "default": "https://playgrounds-storage-public.runcomfy.net/tools/7396/media-files/input-first-1.png"
    },
    "last_frame": {
      "title": "Last Frame Image",
      "description": "Ending keyframe image for the video transition.",
      "type": "string",
      "default": "https://playgrounds-storage-public.runcomfy.net/tools/7396/media-files/input-last-1.png"
    },
    "duration": {
      "title": "Duration (seconds)",
      "description": "The duration of the generated video in seconds. Between 4 and 30.",
      "type": "integer",
      "minimum": 4,
      "maximum": 30,
      "default": 5
    },
    "generate_audio": {
      "title": "Generate Audio",
      "description": "When true, the model outputs video with synchronized audio (speech, SFX, music).",
      "type": "boolean",
      "default": true
    }
  }
}

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"
        }
      }
    }
  }
}

RunComfy

RunComfy is the premier ComfyUI platform, offering ComfyUI online environment and services, along with ComfyUI workflows featuring stunning visuals. RunComfy also provides AI Models, enabling artists to harness the latest AI tools to create incredible art.

1. Get started

Use RunComfy's API to run bytedance/seedance-2.5/first-last-frame/720p. For accepted inputs and outputs, see the model's schema.

curl --request POST \
  --url https://model-api.runcomfy.net/v1/models/bytedance/seedance-2.5/first-last-frame/720p \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer <token>" \
  --data '{
    "prompt": "A cinematic golden-hour safari sequence: the camera glides across the sunlit savanna past a herd of grazing zebras and settles on a majestic lion resting on a rocky outcrop as the sun sinks toward the horizon, warm volumetric light, drifting dust, smooth continuous motion, natural wildlife ambience.",
    "first_frame": "https://playgrounds-storage-public.runcomfy.net/tools/7396/media-files/input-first-1.png",
    "last_frame": "https://playgrounds-storage-public.runcomfy.net/tools/7396/media-files/input-last-1.png"
  }'

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/seedance-2.5/first-last-frame/720p \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer <token>" \
  --data '{
    "prompt": "A cinematic golden-hour safari sequence: the camera glides across the sunlit savanna past a herd of grazing zebras and settles on a majestic lion resting on a rocky outcrop as the sun sinks toward the horizon, warm volumetric light, drifting dust, smooth continuous motion, natural wildlife ambience.",
    "first_frame": "https://playgrounds-storage-public.runcomfy.net/tools/7396/media-files/input-first-1.png",
    "last_frame": "https://playgrounds-storage-public.runcomfy.net/tools/7396/media-files/input-last-1.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)

5. Schema

Input schema

{
  "type": "object",
  "title": "Input schema",
  "required": [
    "prompt",
    "first_frame",
    "last_frame"
  ],
  "properties": {
    "prompt": {
      "title": "Prompt",
      "description": "Text prompt describing the transition and motion between the first and last frames.",
      "type": "string",
      "default": "A cinematic golden-hour safari sequence: the camera glides across the sunlit savanna past a herd of grazing zebras and settles on a majestic lion resting on a rocky outcrop as the sun sinks toward the horizon, warm volumetric light, drifting dust, smooth continuous motion, natural wildlife ambience."
    },
    "first_frame": {
      "title": "First Frame Image",
      "description": "Starting keyframe image for the video transition.",
      "type": "string",
      "default": "https://playgrounds-storage-public.runcomfy.net/tools/7396/media-files/input-first-1.png"
    },
    "last_frame": {
      "title": "Last Frame Image",
      "description": "Ending keyframe image for the video transition.",
      "type": "string",
      "default": "https://playgrounds-storage-public.runcomfy.net/tools/7396/media-files/input-last-1.png"
    },
    "duration": {
      "title": "Duration (seconds)",
      "description": "The duration of the generated video in seconds. Between 4 and 30.",
      "type": "integer",
      "minimum": 4,
      "maximum": 30,
      "default": 5
    },
    "generate_audio": {
      "title": "Generate Audio",
      "description": "When true, the model outputs video with synchronized audio (speech, SFX, music).",
      "type": "boolean",
      "default": true
    }
  }
}

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"
        }
      }
    }
  }
}

Seedance 2.5 First & Last Frame 720p bridges a start frame and an end frame into a 4–30-second 720p clip with optional native audio. The output aspect ratio follows your input frames.

Table of contents

1. Get started

2. Authentication

3. API reference

Submit a request

Monitor request status

Retrieve request results

Cancel a request

4. File inputs

Hosted file (URL)

5. Schema

Input schema

Output schema

Seedance 2.5 First & Last Frame 720p bridges a start frame and an end frame into a 4–30-second 720p clip with optional native audio. The output aspect ratio follows your input frames.

Table of contents

1. Get started

2. Authentication

3. API reference

Submit a request

Monitor request status

Retrieve request results

Cancel a request

4. File inputs

Hosted file (URL)

5. Schema

Input schema

Output schema

Seedance 2.5 First & Last Frame: Keyframe Transition Video on Models and API | RunComfy

Seedance 2.5 First & Last Frame 720p bridges a start frame and an end frame into a 4–30-second 720p clip with optional native audio. The output aspect ratio follows your input frames.

Table of contents

1. Get started

2. Authentication

3. API reference

Submit a request

Monitor request status

Retrieve request results

Cancel a request

4. File inputs

Hosted file (URL)

5. Schema

Input schema

Output schema

Seedance 2.5 First & Last Frame: Keyframe Transition Video on Models and API | RunComfy

Seedance 2.5 First & Last Frame 720p bridges a start frame and an end frame into a 4–30-second 720p clip with optional native audio. The output aspect ratio follows your input frames.

Table of contents

1. Get started

2. Authentication

3. API reference

Submit a request

Monitor request status

Retrieve request results

Cancel a request

4. File inputs

Hosted file (URL)

5. Schema

Input schema

Output schema