> ## Documentation Index > Fetch the complete documentation index at: https://docs.evolink.ai/llms.txt > Use this file to discover all available pages before exploring further. # Wan2.6 Reference Video Flash > - WAN2.6 Flash (wan2.6-reference-video-flash) model supports reference video generation with faster speed - Upload reference videos, the model will reference character appearance and voice from the videos to generate new videos - Asynchronous processing mode, use the returned task ID to [query status](/en/api-manual/task-management/get-task-detail) - Generated video links are valid for 24 hours, please save them promptly - **Billing Note**: Uses combined billing of "input video duration + output video duration", only charges for successful video generation, no charge for failures ## OpenAPI ````yaml /en/api-manual/video-series/wan2.6/wan2.6-reference-video-flash.json POST /v1/videos/generations openapi: 3.1.0 info: title: wan2.6-reference-video-flash API description: >- Generate videos using the WAN2.6 Flash model with reference videos, faster speed, referencing character appearance and voice from uploaded videos license: name: MIT version: 1.0.0 servers: - url: https://api.evolink.ai description: Production Environment security: - bearerAuth: [] paths: /v1/videos/generations: post: tags: - Video Generation summary: wan2.6-reference-video-flash API description: >- - WAN2.6 Flash (wan2.6-reference-video-flash) model supports reference video generation with faster speed - Upload reference videos, the model will reference character appearance and voice from the videos to generate new videos - Asynchronous processing mode, use the returned task ID to [query status](/en/api-manual/task-management/get-task-detail) - Generated video links are valid for 24 hours, please save them promptly - **Billing Note**: Uses combined billing of "input video duration + output video duration", only charges for successful video generation, no charge for failures operationId: createWan26ReferenceVideoFlashGeneration requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/Wan26ReferenceVideoFlashRequest' examples: reference_video: summary: Reference Video Generation value: model: wan2.6-reference-video-flash prompt: A person dancing video_urls: - >- https://help-static-aliyun-doc.aliyuncs.com/file-manage-files/xxx.mp4 responses: '200': description: Video task created successfully content: application/json: schema: $ref: '#/components/schemas/VideoGenerationResponse' '400': description: Invalid request parameters content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: invalid_request message: Invalid request parameters type: invalid_request_error '401': description: Unauthenticated, invalid or expired token content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: unauthorized message: Invalid or expired token type: authentication_error '402': description: Insufficient quota, recharge required content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: insufficient_quota message: Insufficient quota. Please top up your account. type: insufficient_quota '403': description: Access denied content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: model_access_denied message: >- Token does not have access to model: wan2.6-reference-video-flash type: invalid_request_error '429': description: Rate limit exceeded content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: rate_limit_exceeded message: Too many requests, please try again later type: rate_limit_error '500': description: Internal server error content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: code: internal_error message: Internal server error type: api_error components: schemas: Wan26ReferenceVideoFlashRequest: type: object required: - model - prompt - video_urls properties: model: type: string description: Model name enum: - wan2.6-reference-video-flash default: wan2.6-reference-video-flash example: wan2.6-reference-video-flash prompt: type: string description: Prompt describing the desired video, limited to 1500 characters example: A person dancing maxLength: 1500 video_urls: type: array items: type: string format: uri description: >- Array of reference video file URLs. Used to reference character appearance and voice from videos to generate new videos. **URL requirements:** - Supports HTTP or HTTPS protocol - Local files can be uploaded via [Upload File](/en/api-manual/file-series/upload-base64) to get temporary URL **Array limits:** - Maximum 3 videos **Video requirements:** - Format: mp4, mov - Duration: 2～30s - File size: single video not exceeding 100MB **Input video billing rules:** - Each reference video is truncated separately then summed, total input billing duration cap is `5` seconds - 1 video: `min(video duration, 5s)` - 2 videos: `min(video1 duration, 2.5s) + min(video2 duration, 2.5s)` - 3 videos: `min(video1 duration, 1.65s) + min(video2 duration, 1.65s) + min(video3 duration, 1.65s)` - `1080p` quality has higher pricing maxItems: 3 example: - >- https://help-static-aliyun-doc.aliyuncs.com/file-manage-files/xxx.mp4 aspect_ratio: type: string description: >- Video aspect ratio, defaults to `16:9` **Options:** - `720p`: Supports `16:9` (landscape), `9:16` (portrait), `1:1` (square), `4:3`, `3:4` - `1080p`: Supports `16:9` (landscape), `9:16` (portrait), `1:1` (square), `4:3`, `3:4` example: '16:9' quality: type: string description: >- Video quality, defaults to `720p` **Options:** - `720p`: Standard quality, standard pricing, this is the default - `1080p`: High quality, higher pricing **Note:** Different qualities support different aspect ratios, see `aspect_ratio` parameter example: 720p duration: type: integer description: >- Specify the duration of the generated video (seconds) **Note:** - Supports any integer value between `2~10` seconds **Output video billing rules:** - Output video billing duration: actual seconds of successfully generated video minimum: 2 maximum: 10 example: 5 model_params: type: object description: Model parameter configuration properties: shot_type: type: string description: >- Specify the shot type of the generated video, i.e., whether the video consists of a single continuous shot or multiple switching shots **Parameter priority:** - `shot_type` > `prompt` - For example, if `shot_type` is set to `single`, even if `prompt` contains `generate multi-shot video`, the model will still output a single-shot video **Options:** - `single`: Default, outputs single-shot video - `multi`: Outputs multi-shot video **Note:** - When you want strict control over video narrative structure (e.g., single-shot for product demos, multi-shot for story shorts), use this parameter enum: - single - multi example: single generate_audio: type: boolean description: |- Whether to generate audio, defaults to `true` **Options:** - `true`: Generate video with audio, higher pricing - `false`: Generate video without audio, lower pricing default: true example: true callback_url: type: string description: >- HTTPS callback URL for task completion **Callback timing:** - Triggered when task is completed, failed, or cancelled - Sent after billing confirmation is complete **Security restrictions:** - Only HTTPS protocol supported - Cannot callback to internal IP addresses (127.0.0.1, 10.x.x.x, 172.16-31.x.x, 192.168.x.x, etc.) - URL length not exceeding `2048` characters **Callback mechanism:** - Timeout: `10` seconds - Maximum `3` retries on failure (retries at `1`/`2`/`4` seconds after failure) - Callback response format is consistent with task query API response - Callback URL returning 2xx status code is considered successful, other status codes trigger retries format: uri example: https://your-domain.com/webhooks/video-task-completed VideoGenerationResponse: type: object properties: created: type: integer description: Task creation timestamp example: 1757169743 id: type: string description: Task ID example: task-unified-1757169743-7cvnl5zw model: type: string description: Actual model name used example: wan2.6-reference-video-flash object: type: string enum: - video.generation.task description: Specific task type progress: type: integer description: Task progress percentage (0-100) minimum: 0 maximum: 100 example: 0 status: type: string description: Task status enum: - pending - processing - completed - failed example: pending task_info: $ref: '#/components/schemas/VideoTaskInfo' description: Video task details type: type: string enum: - text - image - audio - video description: Task output type example: video usage: $ref: '#/components/schemas/Usage' description: Usage and billing information ErrorResponse: type: object properties: error: type: object properties: code: type: string description: Error code identifier message: type: string description: Error description type: type: string description: Error type VideoTaskInfo: type: object properties: can_cancel: type: boolean description: Whether the task can be cancelled example: true estimated_time: type: integer description: Estimated completion time (seconds) minimum: 0 example: 120 Usage: type: object description: Usage and billing information properties: billing_rule: type: string description: Billing rule enum: - per_call - per_token - per_second example: per_call credits_reserved: type: number description: Estimated credits consumed minimum: 0 example: 5 user_group: type: string description: User group category enum: - default - vip example: default securitySchemes: bearerAuth: type: http scheme: bearer description: >- ##All APIs require Bearer Token authentication## **Get API Key:** Visit [API Key Management Page](https://evolink.ai/dashboard/keys) to get your API Key **Add to request header:** ``` Authorization: Bearer YOUR_API_KEY ``` ````