> ## Documentation Index
> Fetch the complete documentation index at: https://docs.bytespike.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# veo3.1-fast

> Google Veo 3.1 Fast — the lower-cost tier of Veo. Trades some fidelity and the audio option for a meaningfully cheaper per-second price. Default for volume / programmatic video pipelines on the Google stack.

`veo3.1-fast` is the Fast tier of [`veo3.1`](/models/veo3-1). Trade-offs: drops the native audio option, slightly looser fidelity on hard motion, and meaningfully lower per-second cost. The right default for programmatic / volume video work where top-tier fidelity isn't the bar.

**Pricing:** $0.20 / second of generated footage — see the [rate card](/pricing). Failures don't bill. For the very cheapest Veo tier, `veo3.1-lite` runs at $0.05 / second.

## Protocols

| Protocol              | Path                                                     | Purpose                           |
| --------------------- | -------------------------------------------------------- | --------------------------------- |
| OpenAI Video — submit | `POST https://llm.bytespike.ai/v1/videos/generations`    | enqueues; returns `task_id`       |
| OpenAI Video — poll   | `GET https://llm.bytespike.ai/v1/videos/tasks/{task_id}` | returns `status` and `result_url` |

## Quickstart

```bash theme={null}
TASK_ID=$(curl -s https://llm.bytespike.ai/v1/videos/generations \
  -H "Authorization: Bearer $BYTESPIKE_API_KEY" \
  -H "content-type: application/json" \
  -d '{
    "model": "veo3.1-fast",
    "prompt": "A coffee cup steaming on a kitchen counter, morning light",
    "duration_seconds": 5,
    "size": "1280x720"
  }' | jq -r .task_id)

# Poll GET /v1/videos/tasks/{task_id} until status is "succeeded"
```

## Capabilities

| Capability                           | Supported                                    |
| ------------------------------------ | -------------------------------------------- |
| Text-to-video                        | ✅                                            |
| Image-to-video (with `source_image`) | ✅                                            |
| Audio generation                     | — (use [`veo3.1`](/models/veo3-1) for audio) |
| `duration_seconds` 5 / 10            | ✅                                            |
| `size` 1280×720                      | ✅                                            |
| Modality                             | video                                        |
| Capability bucket                    | `video_generate`                             |

## When to use

* **Volume / programmatic video** — short social-card clips, A/B variants, demo placeholders.
* **No audio needed** — explainer-style clips that will be dubbed or scored separately.
* **Internal-facing creative** — quick visualizations for design review.

When **not** to use:

* Audio matters in the deliverable — go to [`veo3.1`](/models/veo3-1).

## Next

* [`veo3.1`](/models/veo3-1) — full tier with audio
* [Multimodal endpoints](/concepts/multimodal) — overview