Molmo2 Video Captioner: AI Large Language Models
Generate detailed video captions with Molmo2. Choose low, medium, or high detail for temporal scene descriptions and visual summaries. Pay per 5 seconds.
Generate detailed video captions with Molmo2. Choose low, medium, or high detail for temporal scene descriptions and visual summaries. Pay per 5 seconds.
About this model
Molmo2 Video Captioner turns a public video URL into a detailed written description that tracks what happens over time, not just what appears in a single frame. It can identify subjects, objects, scene changes, camera movement, interactions, and important visual context, making the result useful as accessibility alt text, a searchable media-library description, or input for downstream creative and automation workflows. Choose low detail for a concise summary, medium for a balanced caption, or high for a more comprehensive account of temporal actions and scene structure. Clips can be up to two minutes long, and the API returns the caption asynchronously so long-running video analysis fits cleanly into production pipelines, workflow nodes, and background jobs.
Cost analysis
| Provider | Cost | Notes |
|---|---|---|
| muapiapp | $0.006 minimum; $0.010 per 5s | Duration-based billing with a three-second minimum and 120-second maximum. |
Duration-based billing with a three-second minimum and 120-second maximum.
** Competitor pricing is estimated based on similar model architectures and usage tiers.
Configuration schema
| Parameter | Type | Description | Default |
|---|---|---|---|
| Video URL | string | Public video URL to caption. Supports common video formats and a maximum duration of 2 minutes. | https://interactive-examples.mdn.mozilla.net/media/cc0-videos/flower.mp4 |
| Detail Level | Enum (3 options) | Caption detail: low for a brief summary, medium for a balanced description, or high for comprehensive temporal and visual detail. | medium |
Public video URL to caption. Supports common video formats and a maximum duration of 2 minutes.
https://interactive-examples.mdn.mozilla.net/media/cc0-videos/flower.mp4Caption detail: low for a brief summary, medium for a balanced description, or high for comprehensive temporal and visual detail.
mediumDeveloper documentation
Send a POST request to /api/v1/molmo2-video-captioner with a public video_url and optional detail_level of low, medium, or high. The API returns a request_id. Poll /api/v1/predictions/{id}/result until status is completed, or provide a webhook URL for asynchronous delivery.
curl -X POST "https://api.muapi.ai/api/v1/molmo2-video-captioner"
-H "x-api-key: YOUR_API_KEY"
-H "Content-Type: application/json"
-d '{
"video_url": "https://example.com/video.mp4",
"detail_level": "medium"
}'
The completed response places the generated caption in the outputs array. Clips may be up to 120 seconds long.
Frequently asked
It returns a written caption describing the video's subjects, objects, actions, scene changes, camera movement, and relevant visual context.
Pass a publicly reachable video URL in video_url. Common video formats are supported, and the maximum input duration is two minutes.
Low produces a concise summary, medium provides a balanced description, and high gives a more comprehensive account of temporal actions and visual details.
The request is asynchronous. Submit the video, receive a request_id, and poll the result endpoint or supply a webhook URL to receive the completed caption.
Billing is based on video duration at $0.010 per five seconds, with a $0.006 minimum for up to three seconds and a maximum billable duration of 120 seconds.
Yes. The model is available as a text-output workflow node, so its caption can feed into downstream writing, search, classification, or publishing steps.