> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.ltx.io/api-changelog/2026/8/18/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.ltx.io/_mcp/server.

## Audio-to-video resolution parity

* **Audio-to-video** now supports the same resolution tiers as text-to-video and image-to-video: `ltx-2-5-fast` up to 4K, `ltx-2-5-pro` up to 1080p, and `ltx-2-3-pro` up to 4K.
* Maximum input audio length depends on model and resolution tier — for example, `ltx-2-3-pro` accepts up to 20 seconds at 720p/1080p and up to 10 seconds at 1440p/4K. See the [API reference](/api-documentation/api-reference/async-video-generation/submit-audio-to-video) for the full table.
* New resolution tiers are billed at the rates shown on [Pricing](/pricing).

Available on [**v2/audio-to-video**](/api-documentation/api-reference/async-video-generation/submit-audio-to-video) and [**v1/audio-to-video**](/api-documentation/api-reference/video-generation/audio-to-video).