> ## Documentation Index
> Fetch the complete documentation index at: https://docs.myrouter.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# PixVerse V4.5 Text-to-Video

Generate high-quality videos from text descriptions using PixVerse's latest v4.5 model. Supports multiple resolutions, aspect ratios, and motion modes for diverse video creation.

<Tip>
  This is an **async** API that only returns the task\_id of the async task. Use the task\_id to call the [Get Async Task Result API](/docs/models/reference-get-async-task-result) to retrieve the generated result.
</Tip>

## Request Headers

<ParamField header="Content-Type" type="string" required={true}>
  Enum: `application/json`
</ParamField>

<ParamField header="Authorization" type="string" required={true}>
  Bearer authentication format: Bearer \{\{API Key}}.
</ParamField>

## Request Body

<ParamField body="prompt" type="string" required={true}>
  Text prompt for video generation.

  * Maximum length: 2048 characters
  * Clearly describe the desired scene and actions
</ParamField>

<ParamField body="aspect_ratio" type="string" required={true}>
  Aspect ratio of the video. Default: `16:9`<br />
  Acceptable values: `16:9`, `4:3`, `1:1`, `3:4`, `9:16`
</ParamField>

<ParamField body="resolution" type="string" required={true}>
  Video quality. Default: `540p`<br />
  Acceptable values:

  * When fast\_mode is false: `360p`, `540p`, `720p`, `1080p`
  * When fast\_mode is true: `360p`, `540p`, `720p`
</ParamField>

<ParamField body="negative_prompt" type="string" required={false}>
  Negative prompt for generation.

  * Maximum length: 2048 characters
</ParamField>

<ParamField body="fast_mode" type="boolean" required={false}>
  Whether to enable fast mode, which generates videos faster but may reduce quality and lower the price.

  Default: `false`.
</ParamField>

<ParamField body="style" type="string" required={false}>
  Style preset (v3.5 only).<br />
  Acceptable values: `anime`, `3d_animation`, `clay`, `comic`, `cyberpunk`
</ParamField>

<ParamField body="seed" type="integer" required={false}>
  Random seed for generation.
</ParamField>

## Response

<ResponseField name="task_id" type="string" required={true}>
  The task\_id of the async task. Use the task\_id to call the [Get Async Task Result API](/docs/models/reference-get-async-task-result) to retrieve the generated result.
</ResponseField>