> This page is for version v1.3 (default).
> For other versions, use one of these documentation indexes:
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> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.twelvelabs.io/llms.txt.
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## Pegasus 1.5 now supports synchronous analysis

You can now use Pegasus 1.5 with the synchronous analysis endpoint. Set the `model_name` parameter to `pegasus1.5` when calling the [`POST`](/v1.3/api-reference/analyze-videos/sync-analysis) method of the `/analyze` endpoint to analyze videos directly from a URL, asset, or base64 string and receive results in the response.

The following Pegasus 1.5 capabilities, previously available only through async analysis, are now available on the synchronous analysis endpoint:

* **Structured prompts with reference images**: Use the `prompt_v2` parameter to include up to 4 reference images in your prompt.
* **Video clipping**: Use the `start_time` and `end_time` parameters to analyze a specific portion of the video. The clip must be at least 4 seconds long.

> **Note**
>
> Synchronous analysis with Pegasus 1.5 supports general analysis (prompt-based text generation) only. For video segmentation, use the [`POST`](/v1.3/api-reference/analyze-videos/create-async-analysis-task) method of the `/analyze/tasks` endpoint.

For complete parameter specifications, see the [Sync analysis](/v1.3/api-reference/analyze-videos/sync-analysis) page in the API Reference section.