> ## Documentation Index > Fetch the complete documentation index at: https://docs.anyfast.ai/llms.txt > Use this file to discover all available pages before exploring further. # seedance-2.5 > Create Seedance 2.5 video generation tasks with text, image, video, and audio references. ## OpenAPI ````yaml api-reference/model-api/bytedance/openapi/seedance-2-5/openapi.yaml POST /v1/video/generations openapi: 3.1.0 info: title: Seedance 2.5 description: >- Seedance 2.5 video generation with multimodal references, editing, extension, and synchronized audio. version: 1.0.0 servers: - url: https://www.anyfast.ai security: - bearerAuth: [] paths: /v1/video/generations: post: summary: Create Video Generation Task description: > Create an asynchronous Seedance 2.5 task for text-to-video, first-frame or first-and-last-frame generation, multimodal reference generation, video editing, or video extension. Poll `GET /v1/video/generations/{id}` until `status` is `succeeded`. operationId: createSeedance25 requestBody: required: true content: application/json: schema: type: object required: - model - content properties: model: type: string enum: - seedance-2.5 description: AnyFast model ID. example: seedance-2.5 content: type: array minItems: 1 maxItems: 51 description: > Input content. Put the optional text prompt first, then media items. Seedance 2.5 accepts up to 30 reference images, 10 reference videos, and 10 reference audio clips. Reference videos and audio clips may total at most 30 seconds per media type. The complete request body must not exceed 64 MB; avoid Base64 for large files. items: type: object required: - type properties: type: type: string enum: - text - image_url - video_url - audio_url description: Content item type. text: type: string description: >- Optional prompt text. Use `@image1`, `@video1`, and `@audio1` to refer to media by type and order. image_url: type: object description: >- Image input. Supports a public URL, Base64 data URI, or `asset://`. properties: url: type: string description: >- JPEG, PNG, WebP, BMP, TIFF, GIF, HEIC, or HEIF image. Width/height ratio 0.4–2.5; each side 300–6000 px; less than 30 MB. video_url: type: object description: >- Video input. Supports a public URL or `asset://`. properties: url: type: string description: >- MP4 or MOV video using H.264/H.265 video and AAC/MP3 audio. 480p or 720p; 2–30 seconds; 24–60 FPS; width/height ratio 0.4–2.5; each side 300–6000 px; 409,600–8,295,044 pixels per frame; up to 200 MB. audio_url: type: object description: >- Audio input. Seedance 2.5 supports audio-only reference generation. properties: url: type: string description: >- WAV or MP3 audio, 2–30 seconds, up to 15 MB. Supports URL, Base64, or asset ID. role: type: string enum: - first_frame - last_frame - reference_image - reference_video - reference_audio description: > Media role. Use `first_frame` and optional `last_frame` for image-to-video. Use `reference_*` for reference generation, editing, and extension. example: - type: text text: >- A cinematic tracking shot of @image1 walking through a rain-lit city - type: image_url image_url: url: https://example.com/character.jpg role: reference_image callback_url: type: string format: uri description: >- Optional callback URL that receives POST notifications when the asynchronous task status changes. execution_expires_after: type: integer default: 172800 description: >- Maximum time in seconds that a queued or running task may execute before it expires. priority: type: integer default: 0 description: Task execution priority. safety_identifier: type: string description: Stable end-user identifier used for safety tracing. seed: type: integer default: -1 description: Random seed. Use `-1` for a random seed. service_tier: type: string default: default description: Task service tier. generate_audio: type: boolean default: true description: >- Generate synchronized dialogue, sound effects, and background audio. resolution: type: string enum: - 480p - 720p default: 720p description: Output video resolution. ratio: type: string enum: - '21:9' - '16:9' - '4:3' - '1:1' - '3:4' - '9:16' - adaptive default: adaptive description: > Output aspect ratio. For text and ordinary reference generation, `adaptive` selects the best supported ratio. Video editing and extension follow the selected source video; frame-guided generation follows the first frame. Editing, extension, and first-frame/first-and-last-frame tasks require `adaptive`. duration: type: integer enum: - -1 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18 - 19 - 20 - 21 - 22 - 23 - 24 - 25 - 26 - 27 - 28 - 29 - 30 default: -1 description: > Output duration in seconds. Use `-1` to let the model choose a duration from 4–30 seconds. Video editing requires `-1` and follows the source duration, possibly up to 0.4 seconds shorter. Extension and frame-guided generation accept `-1` or 4–30. output_format: type: string enum: - mp4 - mov default: mp4 description: >- Output container. MOV uses high-color-fidelity H.264/yuv444p video and PCM audio for editing workflows. tools: type: array description: >- Optional generation tools. Web search is available for text-to-video. items: type: object properties: type: type: string enum: - web_search watermark: type: boolean default: false description: Add an AI-generated watermark to the lower-right corner. return_last_frame: type: boolean default: false description: Return the generated video's final frame as an image. responses: '200': description: Video generation task created content: application/json: schema: type: object required: - id - task_id - object - model - status - progress - created_at properties: id: type: string description: Task ID used for polling. example: asyntask_h81efT0qwtLnzyt6VENmCZ6VXSfNxE2E task_id: type: string description: Task ID, identical to `id`. example: asyntask_h81efT0qwtLnzyt6VENmCZ6VXSfNxE2E object: type: string enum: - video example: video model: type: string enum: - seedance-2.5 example: seedance-2.5 status: type: string enum: - queued description: Initial asynchronous task status. example: queued progress: type: integer description: Initial task progress percentage. example: 0 created_at: type: integer description: Unix timestamp. example: 1786084139 '400': description: Invalid request content: application/json: schema: $ref: '#/components/schemas/Error' '401': description: Unauthorized content: application/json: schema: $ref: '#/components/schemas/Error' components: schemas: Error: type: object properties: error: type: object properties: code: type: string message: type: string securitySchemes: bearerAuth: type: http scheme: bearer ````