UniAll AI SEO/GEO · Veo3.1 Fast Video 4K · 2026-05-31

Veo3.1 Fast Video 4K API

**Model ID:** `veo3.1-fast-video-4k`

Veo3.1 Fast Video 4K is an async AI video generation model built for fast production workflows. It supports:

• Text to video
• Image to video
• First/last frame video creation
• Reference media to video
• Video editing and video extension

It is a good fit for teams that need short-form ads, product demos, social content, and automated video generation pipelines.

Pricing

The public price for **Veo3.1 Fast Video 4K** is **$0.204 per second** for 4K output.

• 4K video: **$0.204/sec**
• 4K with audio: **$0.238/sec**
• 720p / 1080p options are also available at lower rates

Because billing is per second, a 6-second 4K clip costs about **$1.224** before any platform-specific fees or taxes.

How to call the API

Use the async generation endpoint:

```http POST /v1/videos/generations ```

Typical request fields:

• `model`: `veo3.1-fast-video-4k`
• `generation_mode`: one of the supported modes
• `prompt`: required
• `duration`: 4, 6, or 8 seconds
• `resolution`: `720p`, `1080p`, or `4k`
• `aspect_ratio`: `16:9` or `9:16`
• `generate_audio`: optional
• `image_url`, `first_image_url`, `last_image_url`, or `video_url` depending on the mode

Example

```json { "model": "veo3.1-fast-video-4k", "generation_mode": "text_to_video", "prompt": "A cinematic product reveal with soft studio lighting and smooth camera movement.", "duration": 8, "resolution": "4k", "aspect_ratio": "16:9", "generate_audio": false } ```

Supported use cases

This model is especially useful for:

• Short video ads
• E-commerce product showcases
• Brand intros and motion concepts
• Vertical social videos
• Reference-based creative generation
• Quick edits from an existing source video

Practical buying guidance

Choose **4K** when output quality matters more than cost. Choose **720p** or **1080p** when you want lower spend or faster iteration. If you need narration or synced audio, use the audio-enabled resolution variant.

For teams building a video workflow, the key advantage is the combination of **async execution**, **multiple generation modes**, and **per-second billing**.

What to expect

• One video per generation
• Duration support from 4 to 8 seconds
• 9:16 and 16:9 aspect ratios
• Reference image, first/last frame, and source video inputs supported
• Best suited for short clips rather than long-form video

Summary

If you need a fast, high-resolution video model with straightforward per-second pricing, **Veo3.1 Fast Video 4K** is a solid option for production and prototyping alike.