> ## Documentation Index > Fetch the complete documentation index at: https://docs.vidgo.ai/llms.txt > Use this file to discover all available pages before exploring further. # Kling O3 Pro Text To Video > Generate 3–15-second videos from text prompts with Kling O3 Pro. Supports single-shot and multi-shot generation. Explicitly set sound; multi-shot requires audio. Submit with your Vidgo API key, then query [task status](/api-manual/task-management/status) using the returned task ID. An optional callback receives the final result. The submit response above is an initial-state illustration, not the completed video response. ## Parameters Use model `kwaivgi/kling-video-o3-pro/text-to-video`. Put generation parameters inside `input`. * **`prompt`**: Required when multi\_shots=false. Describe the scene, action and camera movement. Use nonblank text, up to 2,500 characters after trimming. Omit prompt when multi\_shots=true. * **`multi_prompt`**: Required when multi\_shots=true; omit in single-shot mode. Supply at least one shot, each with a nonblank prompt of up to 2,500 characters and an integer duration of 1–12 seconds. Shot durations must sum to the top-level duration (3–15 seconds). Extra fields inside a shot are ignored. * **`duration`**: Required integer from 3 to 15 seconds. In multi-shot mode, this must equal the sum of all shot durations. Credits are calculated using this value. * **`multi_shots`**: Required: explicitly send false for a single shot or true for multiple shots. Single-shot mode requires prompt. Multi-shot mode requires multi\_prompt and sound=true, with no nonblank top-level prompt. Omitting this field is an error. * **`sound`**: Required: explicitly send true to generate audio or false for video without audio. Single-shot mode accepts either value; multi-shot mode requires true. * **`aspect_ratio`**: Optional: 16:9 (landscape), 9:16 (portrait) or 1:1 (square). Sets the video aspect ratio. Use standard JSON numbers and booleans. For compatibility, integer strings such as "5" are accepted. Boolean strings true/1/yes/y/on mean true; false/0/no/n/off mean false. These strings are case-insensitive and trimmed. Numeric 1 and 0 are also accepted for boolean fields. Numeric and boolean prompt values are converted to text; 0, false and null are treated as empty. Objects and arrays are not accepted as prompts. Unsupported input fields, including reference\_image\_urls and kling\_elements, are rejected. HTTP(S) URLs must have a hostname and no embedded credentials. ## Pricing 13 credits/s without sound; 16 credits/s with sound. Credits = duration × rate. Failed generation tasks are refunded. ## Default example: A Quiet Apology This is the same default example shown on the [model page](https://vidgo.ai/apis/models/kwaivgi/kling-video-o3-pro/text-to-video). ```json theme={null} { "model": "kwaivgi/kling-video-o3-pro/text-to-video", "input": { "duration": 5, "sound": true, "multi_shots": true, "multi_prompt": [ { "prompt": "Cinematic whimsical realism in a warm oak library. Medium two-shot: a small ivory robot with an oval face and amber eyes shelves a blue book, accidentally knocking one red book onto the floor. Beside it, an adult librarian wears a green cardigan and round glasses. Both remain visible under warm reading lamps. One distinct book thud against quiet room tone. Unmarked book covers. No text, logos or watermarks.", "duration": 2 }, { "prompt": "Cut closer to the same ivory robot and green-cardigan librarian in the same oak library. The librarian raises one finger to her lips. The robot tilts its head apologetically and softly says exactly \"Sorry.\" in a gentle robotic voice, synchronized with its small mouth light. Preserve their appearance, positions and warm lighting. End in an embarrassed pause; no music. No text, logos or watermarks.", "duration": 3 } ], "aspect_ratio": "16:9" } } ```