> ## Documentation Index > Fetch the complete documentation index at: https://docs.modellix.ai/llms.txt > Use this file to discover all available pages before exploring further. # Kling Avatar > [Core Function] Kling Avatar is a specialized portrait animation model. [Strengths] It precisely animates a portrait image to lip-sync with an audio file or TTS audio ID. [Best For] Highly recommended for: virtual presenters, talking head videos, and digital avatars. [Limitations] Do NOT use this model for full-body action or general image animation. [Routing] Use this model explicitly when the user wants to make a portrait 'speak' with provided audio. ## OpenAPI ````yaml /model-api/kling/kling-i2v.json post /kling/kling-avatar openapi: 3.1.0 info: description: The image-to-video models API from Kling AI. version: 1.0.0 contact: name: Modellix Support email: support@modellix.ai title: Kling Image-to-Video Models API servers: - url: https://api.modellix.ai/api/v1 description: The image-to-video models API from Kling AI. security: - bearerAuth: [] paths: /kling/kling-avatar: post: summary: Kling Avatar description: >- [Core Function] Kling Avatar is a specialized portrait animation model. [Strengths] It precisely animates a portrait image to lip-sync with an audio file or TTS audio ID. [Best For] Highly recommended for: virtual presenters, talking head videos, and digital avatars. [Limitations] Do NOT use this model for full-body action or general image animation. [Routing] Use this model explicitly when the user wants to make a portrait 'speak' with provided audio. operationId: klingAvatarAsync requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/KlingAvatarRequest' examples: with_audio_id: summary: Using TTS audio ID value: image: https://example.com/avatar.jpg audio_id: audio-abc123 prompt: Speaking with a smile, camera slowly zooms in mode: pro with_sound_file: summary: Using audio file value: image: https://example.com/avatar.jpg sound_file: https://example.com/audio.mp3 prompt: Natural speaking gestures mode: std responses: '200': description: Task submitted successfully content: application/json: schema: $ref: '#/components/schemas/AsyncTaskResponse' example: code: 0 message: success data: status: pending task_id: task-avatar001 model_id: model-123 get_result: method: GET url: https://api.modellix.ai/api/v1/tasks/task-avatar001 '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/Unauthorized' '429': $ref: '#/components/responses/TooManyRequests' '500': $ref: '#/components/responses/InternalServerError' components: schemas: KlingAvatarRequest: type: object required: - image properties: prompt: type: string description: >- Prompt for defining avatar's actions, emotions, and camera movements (1-2500 characters). Optional. minLength: 1 maxLength: 2500 example: Speaking with a smile, camera slowly zooms in image: type: string description: >- Reference image for digital human avatar. Supports URL or Base64 encoded string. Supported formats: JPG/JPEG/PNG. Maximum file size: 10MB. Minimum resolution: 300x300px. Aspect ratio should be between 1:2.5 and 2.5:1. Do not include Base64 prefix (e.g., 'data:image/png;base64,'). minLength: 1 example: https://example.com/avatar.jpg audio_id: type: string description: >- Audio ID generated by TTS API. Mutually exclusive with sound_file - exactly one must be provided. Only supports audio generated within the last 30 days. Audio duration must be between 2-300 seconds. minLength: 1 example: audio-abc123 sound_file: type: string description: >- Audio file URL or Base64 encoded string. Mutually exclusive with audio_id - exactly one must be provided. Supported formats: mp3/wav/m4a/aac. Maximum file size: 5MB. Audio duration must be between 2-300 seconds. minLength: 1 example: https://example.com/audio.mp3 mode: type: string description: >- Generation mode: std (standard, cost-effective) or pro (professional, higher quality but longer processing) default: std enum: - std - pro example: std oneOf: - required: - audio_id - required: - sound_file AsyncTaskResponse: type: object required: - code - message - data properties: code: type: integer description: Response code, 0 indicates success example: 0 message: type: string description: Response message example: success data: type: object required: - status - task_id - model_id properties: status: type: string enum: - pending - processing description: Task status example: pending task_id: type: string description: Unique task identifier example: task-abc123 model_id: type: string description: Model ID example: model-123 get_result: type: object description: API information to query the task result properties: method: type: string description: HTTP method example: GET url: type: string description: Full URL to query the task result example: https://api.modellix.ai/api/v1/tasks/task-abc123 description: Detailed data about the submitted asynchronous task. ErrorResponse: type: object required: - code - message properties: code: type: integer description: Error code (equals HTTP status code) example: 400 message: type: string description: Error message example: 'Invalid parameters: parameter ''image'' is required' responses: BadRequest: description: Invalid request parameters content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: code: 400 message: 'Invalid parameters: parameter ''image'' is required' Unauthorized: description: Unauthorized - Invalid or missing API Key content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: code: 401 message: 'Authentication failed: invalid API key' TooManyRequests: description: Too many requests - Rate limit exceeded headers: X-RateLimit-Limit: description: Maximum requests per minute schema: type: integer example: 100 X-RateLimit-Remaining: description: Remaining quota in current window schema: type: integer example: 0 X-RateLimit-Reset: description: Rate limit window reset time (Unix timestamp) schema: type: integer example: 1704067260 content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: code: 429 message: >- Rate limit exceeded: 100 requests per minute, retry after 60 seconds InternalServerError: description: Internal server error content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: code: 500 message: Internal server error securitySchemes: bearerAuth: type: http scheme: bearer description: 'API Key authentication. Format: `Bearer YOUR_API_KEY`.' ````