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

# Rate Limits

> Review LTX API rate limits and request quotas. Learn how to optimize your usage and avoid throttling with efficient request management.

## Limit types

* **Concurrency limits**: Maximum number of simultaneous video generations. The default is 2 concurrent generations. If you need higher concurrency, [contact sales](https://ltx.io/forms/ltx-contact-sales?placement=docs_rate_limits).

* **Rate limits**: Maximum number of [async (V2)](/async-jobs) jobs queued per organization. Exceeding this queue limit returns `429` with `rate_limit_error`.

## Error response

When a limit is exceeded, the API returns `429 Too Many Requests`. Concurrency limit errors include a `Retry-After` header indicating seconds to wait.

**Error types:**

* `concurrency_limit_error`: Too many concurrent requests (sync API)
* `rate_limit_error`: Queue limit exceeded (async API)

**Examples:**

```json
{
  "type": "error",
  "error": {
    "type": "concurrency_limit_error",
    "message": "Too many concurrent requests. Please try again later."
  }
}
```

```json
{
  "type": "error",
  "error": {
    "type": "rate_limit_error",
    "message": "Queue limit exceeded. Please try again later."
  }
}
```