Veo3.1 Video 4K API for Production AI Video Workflows

What is Veo3.1 Video 4K?

Veo3.1 Video 4K is an AI video generation model available on UniAll AI for creating short, high-quality videos from text, images, frame references, or source video. The public model id is `veo3.1-video-4k`.

It is designed for teams that need 4K output, structured video workflows, and API-based automation rather than only manual generation.

Core capabilities

The model supports several video generation modes:

**Text to video**: generate a clip from a written prompt.
**Image to video**: animate a single reference image.
**Reference image to video**: use 2–3 reference images to guide visual style or subject consistency.
**First/last frame video**: provide a starting frame and ending frame for more controlled motion.
**Video to video / video edit**: use a source video as input for transformation or continuation workflows.
**Video extension**: continue or expand an existing video sequence when supported by the selected mode.

Supported output settings include **4s, 6s, or 8s duration**, **16:9 or 9:16 aspect ratio**, optional audio generation, and resolution choices including **720p, 1080p, and 4K**.

Best use cases

Veo3.1 Video 4K is a good fit for:

Product reveal videos and ecommerce creatives
Short-form social ads in vertical 9:16 format
Cinematic brand clips and campaign assets
Storyboard previews and scene exploration
High-resolution visual concepts for agencies
Automated content pipelines that need consistent API access

For fast iteration, teams may test prompts at lower resolution, then render selected outputs in 4K.

API usage

UniAll AI exposes the model through an async video generation endpoint:

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

Example request:

```json { "model": "veo3.1-video-4k", "generation_mode": "text_to_video", "prompt": "A cinematic product reveal of a premium smartwatch on a dark reflective surface, soft studio lighting, slow dolly camera movement.", "duration": 8, "aspect_ratio": "16:9", "resolution": "4k", "generate_audio": true } ```

For image-guided generation, include fields such as `image_url`, `reference_image_urls`, `first_image_url`, `last_image_url`, or `video_url` depending on the selected `generation_mode`.

Common generation modes include:

`text_to_video`
`reference_image_to_video`
`reference_media_to_video`
`first_last_frame`
`video_to_video`

Because video generation is asynchronous, applications should create a task, poll or receive task status, and retrieve the final video URL after completion.

Pricing angle

Veo3.1 Video 4K is billed per generated second. On UniAll AI, the listed user price for 4K video is **$0.272 per second**, while 4K with audio is **$0.408 per second**. Lower-resolution variants are available for cost control during testing or high-volume workflows.

Example estimated user cost:

8-second 4K video without audio: `8 × $0.272 = $2.176`
8-second 4K video with audio: `8 × $0.408 = $3.264`

Failed generations are eligible for refund according to the platform failure policy. Retry behavior should be handled at the application layer if your workflow requires automatic recovery.

Who should use it?

Veo3.1 Video 4K is most useful for developers, creative automation teams, ecommerce operators, agencies, and enterprise platforms that need API access to high-resolution AI video generation. It is also suitable for reseller or multi-tenant systems that need predictable model ids, parameterized requests, and per-second billing logic.

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常见问题

What is the public model id for Veo3.1 Video 4K?

The public model id is `veo3.1-video-4k`. Use this value in the `model` field when calling the UniAll AI video generation API.

What inputs does Veo3.1 Video 4K support?

It supports text prompts, a single reference image, 2–3 reference images, first and last frame images, and source video input depending on the selected generation mode.

How is Veo3.1 Video 4K priced?

It is billed per generated second. The listed user price is $0.272 per second for 4K video and $0.408 per second for 4K video with audio. Actual cost depends on duration, resolution, and audio settings.