Bytedance Seedance 2.0 Fast API | Pricing & Docs

bytedance/seedance-v2/fast

Generate cinematic videos from text and media inputs with native audio, precise lip-sync, and smooth storytelling control—faster iteration for ads, film previz, and branded visual content.

1. Get started

Use RunComfy's API to run bytedance/seedance-v2/fast. For accepted inputs and outputs, see the model's schema.

curl --request POST \
  --url https://model-api.runcomfy.net/v1/models/bytedance/seedance-v2/fast \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer <token>" \
  --data '{
    "prompt": "Golden hour on a quiet cafe terrace: a barista wipes the counter, then looks up and explains today's special in a friendly tone, natural lip-sync. Medium close-up, slow push-in; warm side light, soft bokeh through glass, gentle cafe ambience and subtle film grain."
  }'

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-v2/fast \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer <token>" \
  --data '{
    "prompt": "Golden hour on a quiet cafe terrace: a barista wipes the counter, then looks up and explains today's special in a friendly tone, natural lip-sync. Medium close-up, slow push-in; warm side light, soft bokeh through glass, gentle cafe ambience and subtle film grain."
  }'

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"
  ],
  "properties": {
    "prompt": {
      "title": "Prompt",
      "description": "Text prompt for the video (Chinese ~≤500 characters, English ~≤1000 words recommended). ",
      "type": "string",
      "default": "Golden hour on a quiet cafe terrace: a barista wipes the counter, then looks up and explains today's special in a friendly tone, natural lip-sync. Medium close-up, slow push-in; warm side light, soft bokeh through glass, gentle cafe ambience and subtle film grain."
    },
    "images": {
      "title": "Images",
      "description": "Reference images for multimodal reference mode (0–9). Support jpeg、png、webp、bmp、tiff、gif.",
      "type": "array",
      "items": {
        "type": "string",
        "format": "image_uri"
      },
      "maxItems": 9
    },
    "videos": {
      "title": "Videos",
      "description": "Reference videos for multimodal reference mode (0–3). Support mp4、mov. Video duration must be between 2 and 15 seconds.",
      "type": "array",
      "items": {
        "type": "string",
        "format": "video_uri"
      },
      "maxItems": 3
    },
    "audios": {
      "title": "Audio URLs",
      "description": "Reference audio for multimodal reference mode (0–3). Support wav、mp3. Audio duration must be between 2 and 15 seconds. Size should be less than 15MB.",
      "type": "array",
      "items": {
        "type": "string",
        "format": "audio_uri"
      },
      "maxItems": 3
    },
    "aspect_ratio": {
      "title": "Aspect Ratio (W:H)",
      "description": "Seedance 2.0 Fast default is adaptive (model picks closest ratio; actual ratio is returned on task query).",
      "type": "string",
      "enum": [
        "adaptive",
        "16:9",
        "9:16",
        "4:3",
        "3:4",
        "1:1",
        "21:9"
      ],
      "default": "adaptive"
    },
    "duration": {
      "title": "Duration (seconds)",
      "description": "Integer seconds in [4, 15].",
      "type": "integer",
      "minimum": 4,
      "maximum": 15,
      "default": 5
    },
    "resolution": {
      "title": "Resolution",
      "description": "",
      "type": "string",
      "enum": [
        "480p",
        "720p",
        "1080p"
      ],
      "default": "720p"
    },
    "generate_audio": {
      "title": "Generate audio",
      "description": "When true, the model outputs video with synchronized audio (speech, SFX, music). ",
      "type": "boolean",
      "default": true
    },
    "seed": {
      "title": "Seed",
      "description": "Random seed for the video generation. ",
      "type": "integer"
    },
    "tools": {
      "title": "Web Search",
      "description": " When `web_search` is included, the model may run an online search depending on the prompt (e.g. specific products, current weather), which can improve factual freshness but increases latency. ",
      "type": "boolean",
      "default": false
    }
  }
}

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-v2/fast. For accepted inputs and outputs, see the model's schema.

curl --request POST \
  --url https://model-api.runcomfy.net/v1/models/bytedance/seedance-v2/fast \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer <token>" \
  --data '{
    "prompt": "Golden hour on a quiet cafe terrace: a barista wipes the counter, then looks up and explains today's special in a friendly tone, natural lip-sync. Medium close-up, slow push-in; warm side light, soft bokeh through glass, gentle cafe ambience and subtle film grain."
  }'

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-v2/fast \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer <token>" \
  --data '{
    "prompt": "Golden hour on a quiet cafe terrace: a barista wipes the counter, then looks up and explains today's special in a friendly tone, natural lip-sync. Medium close-up, slow push-in; warm side light, soft bokeh through glass, gentle cafe ambience and subtle film grain."
  }'

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"
  ],
  "properties": {
    "prompt": {
      "title": "Prompt",
      "description": "Text prompt for the video (Chinese ~≤500 characters, English ~≤1000 words recommended). ",
      "type": "string",
      "default": "Golden hour on a quiet cafe terrace: a barista wipes the counter, then looks up and explains today's special in a friendly tone, natural lip-sync. Medium close-up, slow push-in; warm side light, soft bokeh through glass, gentle cafe ambience and subtle film grain."
    },
    "images": {
      "title": "Images",
      "description": "Reference images for multimodal reference mode (0–9). Support jpeg、png、webp、bmp、tiff、gif.",
      "type": "array",
      "items": {
        "type": "string",
        "format": "image_uri"
      },
      "maxItems": 9
    },
    "videos": {
      "title": "Videos",
      "description": "Reference videos for multimodal reference mode (0–3). Support mp4、mov. Video duration must be between 2 and 15 seconds.",
      "type": "array",
      "items": {
        "type": "string",
        "format": "video_uri"
      },
      "maxItems": 3
    },
    "audios": {
      "title": "Audio URLs",
      "description": "Reference audio for multimodal reference mode (0–3). Support wav、mp3. Audio duration must be between 2 and 15 seconds. Size should be less than 15MB.",
      "type": "array",
      "items": {
        "type": "string",
        "format": "audio_uri"
      },
      "maxItems": 3
    },
    "aspect_ratio": {
      "title": "Aspect Ratio (W:H)",
      "description": "Seedance 2.0 Fast default is adaptive (model picks closest ratio; actual ratio is returned on task query).",
      "type": "string",
      "enum": [
        "adaptive",
        "16:9",
        "9:16",
        "4:3",
        "3:4",
        "1:1",
        "21:9"
      ],
      "default": "adaptive"
    },
    "duration": {
      "title": "Duration (seconds)",
      "description": "Integer seconds in [4, 15].",
      "type": "integer",
      "minimum": 4,
      "maximum": 15,
      "default": 5
    },
    "resolution": {
      "title": "Resolution",
      "description": "",
      "type": "string",
      "enum": [
        "480p",
        "720p",
        "1080p"
      ],
      "default": "720p"
    },
    "generate_audio": {
      "title": "Generate audio",
      "description": "When true, the model outputs video with synchronized audio (speech, SFX, music). ",
      "type": "boolean",
      "default": true
    },
    "seed": {
      "title": "Seed",
      "description": "Random seed for the video generation. ",
      "type": "integer"
    },
    "tools": {
      "title": "Web Search",
      "description": " When `web_search` is included, the model may run an online search depending on the prompt (e.g. specific products, current weather), which can improve factual freshness but increases latency. ",
      "type": "boolean",
      "default": false
    }
  }
}

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"
        }
      }
    }
  }
}

Generate cinematic videos from text and media inputs with native audio, precise lip-sync, and smooth storytelling control—faster iteration for ads, film previz, and branded visual content.

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

Generate cinematic videos from text and media inputs with native audio, precise lip-sync, and smooth storytelling control—faster iteration for ads, film previz, and branded visual content.

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 2.0 Fast: Multimodal Video Generation | RunComfy

Generate cinematic videos from text and media inputs with native audio, precise lip-sync, and smooth storytelling control—faster iteration for ads, film previz, and branded visual content.

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 2.0 Fast: Multimodal Video Generation | RunComfy

Generate cinematic videos from text and media inputs with native audio, precise lip-sync, and smooth storytelling control—faster iteration for ads, film previz, and branded visual content.

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