# Veo 3.1 Lite (`veo_3_1_lite`)

> Google Veo 3.1 Lite. The lowest-priced Veo 3.1: text-to-video and image-to-video with native audio and first and last frame control, up to 1080p.

- Capability: Video (tool `video`) — Text to video, Image to video
- Price: from $0.12 per run (1 credit = $0.01). Exact price for a request: POST https://api.varg.ai/v2/estimate
- Typical time: ~45 s
- JSON Schema: https://api.varg.ai/v2/tools/video?model=veo_3_1_lite (public, no key)
- Try it: https://varg.ai/dashboard/tools/playground?model=veo_3_1_lite

## Call it

REST: `POST https://api.varg.ai/v2/tools/video/call` with `Authorization: Bearer $VARG_API_KEY` (create a key at https://varg.ai/dashboard/api).
It answers `202` with a job right away. Poll `GET /v2/jobs/{id}` until `status` is `completed`, then read `output.outputs[0].url` — or pass `options.webhook_url` and get the finished job POSTed to you.

```bash
curl -X POST https://api.varg.ai/v2/tools/video/call \
  -H "Authorization: Bearer $VARG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "veo_3_1_lite",
  "prompt": "A lighthouse keeper climbs the spiral stairs at dusk, waves crashing outside.",
  "aspect_ratio": "16:9",
  "resolution": "720p"
}'
```

MCP: the varg server `https://mcp.varg.ai/mcp` (OAuth sign-in, no key) runs it with `call_tool`:

```json
{
  "tool": "video",
  "input": {
    "model": "veo_3_1_lite",
    "prompt": "A lighthouse keeper climbs the spiral stairs at dusk, waves crashing outside.",
    "aspect_ratio": "16:9",
    "resolution": "720p"
  },
  "wait": true
}
```

## Inputs

| field | type | required | default | allowed | description |
|---|---|---|---|---|---|
| `model` | string | yes | — | `veo_3_1_lite` or a route key below | Which model runs the job. |
| `prompt` | string | no | — | — | — |
| `files` | array of { url } | no | — | — | — |
| `aspect_ratio` | string | no | — | e.g. 16:9 \| 9:16 \| 1:1 \| 4:3 \| 3:4 \| 21:9 \| auto | — |
| `resolution` | string | no | — | 480p \| 720p \| 1080p \| 4k | Quality tier. Supported by this model: 720p, 1080p. Unsupported tiers fall back to the nearest available. |
| `audio` | boolean | no | — | — | Set true to generate the video with a native audio track. |
| `duration` | integer | no | — | 1–120 | Length in seconds. Supported by this model's routes: fal: 4, 6, 8. A non-numeric value such as "auto" is routed to a route whose schema accepts it; when none does, the request is rejected. |

Media inputs are URLs. Upload a local file first with `POST /v2/files` and pass the returned URL.

## Provider options

Optional, per provider, under `provider_options.<provider>`. Only the options of the provider that runs the job apply — pin a route to choose it.

### provider_options.fal

| field | type | required | default | allowed | description |
|---|---|---|---|---|---|
| `prompt` | string | no | — | — | The text prompt describing the video you want to generate |
| `auto_fix` | boolean | no | — | — | Whether to automatically attempt to fix prompts that fail content policy or other validation checks by rewriting them. |
| `duration` | string | no | — | 4s \| 6s \| 8s | — |
| `resolution` | string | no | — | 720p \| 1080p | — |
| `aspect_ratio` | string | no | — | 16:9 \| 9:16 \| auto | — |
| `generate_audio` | boolean | no | — | — | Whether to generate audio for the video. |
| `safety_tolerance` | string | no | — | 1 \| 2 \| 3 \| 4 \| 5 \| 6 | — |
| `last_frame_url` | string (URL) | no | — | — | URL of the last frame of the video |
| `first_frame_url` | string (URL) | no | — | — | URL of the first frame of the video |
| `image_url` | string (URL) | no | — | — | URL of the input image to animate. Should be 720p or higher resolution in 16:9 or 9:16 aspect ratio. |

## Routes

`"model": "veo_3_1_lite"` picks a route automatically (priority order, then the inputs you send). To pin one, pass its key as `model`.

| model key | provider | modality | price from | typical time |
|---|---|---|---|---|
| `fal:fal-ai/veo3.1/lite` | fal | text-to-video | $0.12 | ~45 s |
| `fal:fal-ai/veo3.1/lite/first-last-frame-to-video` | fal | image-to-video | $0.12 | ~45 s |
| `fal:fal-ai/veo3.1/lite/image-to-video` | fal | image-to-video | $0.12 | ~45 s |

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Catalog version 2026-11-11T12:59:09.901887+00:00. All models: https://varg.ai/models/llms.txt