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

# FLUX.3 video

> Black Forest Labs' video model, guided by keyframes you place in time.

FLUX.3, from Black Forest Labs, makes video guided by frames. Besides start
and end frames, you can place **keyframes** at points in between, so you
decide what the video shows and when. Choose a tier under **Tier**:

* **Standard**, the default.
* **Max** follows prompts more closely and renders faster, and adds
  **Reasoning**. It can't extend a video.

![FLUX.3 selected in the video generator, with the Standard tier and Frames slots for Start at 0 s, Keyframe and End at 5 s, and one References slot.](https://mintcdn.com/zero-gen/m4I7fPs1rAXZSMjU/images/models/flux-3-keyframes.png?fit=max\&auto=format\&n=m4I7fPs1rAXZSMjU\&q=85\&s=d421fc0a48c086d939b7c7bb6ca3866c)

## What you can give it

* **A prompt** on its own.
* **Frames**: a start frame, and an optional end frame.
* **Keyframes**: up to 10 PNG, JPEG or WebP images in all, counting the start
  and end frames. Choose **Keyframe** under **Frames**, pick an image, then
  type the time it should appear, in seconds. Times land on the video's 24 fps
  frames and must fall within its duration.
* **Extend** (Standard): one MP4 video of up to 15 seconds to continue, added
  under **References**.

## Output settings

| Setting | Options |
| - | - |
| Resolution | 720p or 1080p. |
| Aspect ratio | Auto, 21:9, 2:1, 16:9, 4:3, 1:1, 3:4 or 9:16. |
| Duration | 5 to 20 seconds. |
| Audio | On or off. Sound doesn't change the price. |
| Reasoning | Max only: **High**, the default, or **Low** for a quicker render. It doesn't change the price. |
| Quantity | 1 to 4 videos. |

## Cost

FLUX.3 is priced per second of video, by resolution. Keyframes cost the same
per second, and extending a video costs more. A 5-second 720p video on the
Standard tier costs about \$1.11. Max has a promotional price through November
7, 2026, and costs the same as Standard after that. Prices are as of October
28, 2026.

For FLUX.3 images, see [FLUX](https://docs.zerogen.com/models/flux.md).


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