> ## 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 Video O1 > [Core Function] Kling Video O1 is the world's first reasoning-enhanced video model. [Strengths] It performs deep planning over the prompt before generation, delivering best-in-class physical consistency, complex motion logic, and strict adherence to long-form semantics. [Best For] Highly recommended for: complex physical interactions, logically demanding scenes, and prompts requiring deep reasoning. [Limitations] Do NOT use this model if you need multi-shot generation or 15-second durations (it is capped at 10s). [Routing] Route to this model when the prompt involves complex physics, logical sequences, or intricate physical interactions where standard models hallucinate. ## OpenAPI ````yaml /model-api/kling/kling-v2v.json post /kling/kling-video-o1 openapi: 3.1.0 info: description: The video-to-video models API from Kling AI. version: 1.0.0 contact: name: Modellix Support email: support@modellix.ai title: Kling Video-to-Video Models API servers: - url: https://api.modellix.ai/api/v1 description: The video-to-video models API from Kling AI. security: - bearerAuth: [] paths: /kling/kling-video-o1: post: summary: Kling Video O1 description: >- [Core Function] Kling Video O1 is the world's first reasoning-enhanced video model. [Strengths] It performs deep planning over the prompt before generation, delivering best-in-class physical consistency, complex motion logic, and strict adherence to long-form semantics. [Best For] Highly recommended for: complex physical interactions, logically demanding scenes, and prompts requiring deep reasoning. [Limitations] Do NOT use this model if you need multi-shot generation or 15-second durations (it is capped at 10s). [Routing] Route to this model when the prompt involves complex physics, logical sequences, or intricate physical interactions where standard models hallucinate. operationId: klingVideoO1Async requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/KlingVideoO1Request' examples: video_edit: summary: Video editing flow value: prompt: >- Restyle the source video into a clay-animation look while preserving the original motion feel videos: - https://example.com/source-video.mp4 audio: original resolution: 1080p image_and_video: summary: Video edit with reference images value: prompt: >- Keep the subject identity from the reference frame while restyling the source clip images: - https://example.com/reference-frame.jpg videos: - https://example.com/source-video.mp4 audio: 'off' resolution: 720p 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-v2v-abc123 model_id: model-123 get_result: method: GET url: https://api.modellix.ai/api/v1/tasks/task-v2v-abc123 '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/Unauthorized' '429': $ref: '#/components/responses/TooManyRequests' '500': $ref: '#/components/responses/InternalServerError' components: schemas: KlingVideoO1Request: type: object required: - prompt - videos properties: prompt: type: string description: Video generation prompt. minLength: 1 maxLength: 2500 example: Transform the source clip into a cinematic sci-fi sequence images: type: array description: >- Optional reference image list (first/last/refer frames flattened as URLs). Max 4 when a reference video is present. minItems: 1 maxItems: 4 items: type: string description: Reference image URL or Base64 string. minLength: 1 example: https://example.com/reference-frame.jpg videos: type: array description: >- Required reference video list (max 1). Flat URL maps to base video by default. minItems: 1 maxItems: 1 items: type: string description: Reference video URL or Base64 string. minLength: 1 example: https://example.com/source-video.mp4 audio: type: string description: >- Whether to generate audio. Official O1 settings.audio: original | off. Feature video requires off. default: 'off' enum: - original - 'off' example: 'off' resolution: type: string description: Output video resolution. default: 720p enum: - 720p - 1080p example: 1080p aspect_ratio: type: string description: Video aspect ratio. Optional when a reference video is provided. default: '16:9' enum: - '16:9' - '9:16' - '1:1' example: '16:9' duration: type: integer description: >- Video duration in seconds (3-10). Not further restricted when a reference video is provided. default: 5 enum: - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 example: 5 description: >- Kling Video O1 V2V. Feature video requires `audio=off`. Duration enum is 3-10 (first-frame-only 5/10 rule applies to the I2V slice, not V2V). 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-v2v-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-v2v-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 in format ''Category: detail''' example: 'Invalid parameters: prompt is required when multi_shot is false' responses: BadRequest: description: Invalid request parameters content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: code: 400 message: 'Invalid parameters: prompt is required when multi_shot is false' 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`.' ````