# FLUX 3

FLUX 3 is Black Forest Labs' video model with native audio, generally available since 4 August 2026. It is built for multi-shot clips with dialogue and in-scene text. In Sloosh, FLUX 3 makes 5 to 20 second clips at 720p or 1080p from text, start and end frames or up to 8 reference images, with optional sound.

Web page: https://sloosh.ai/models/flux-3

[Use FLUX 3](https://sloosh.ai/studio/video?video-model=flux-3)

## Key facts in Sloosh

|   |   |
| --- | --- |
| Made by | Black Forest Labs |
| Makes | video (with sound: optional, on by default) |
| Inputs | text, start frame (optional), end frame (optional, needs a start frame), up to 8 reference images (can be combined with frames), no reference videos |
| Length | 5 to 20 seconds (whole seconds) |
| Resolution | 720p, 1080p |
| Aspect ratios | 21:9, 16:9, 4:3, 1:1, 3:4, 9:16 |
| Prompt limit | 5,000 characters |

## Best for

- Clips up to 20 seconds with dialogue, effects and ambience made alongside the picture; BFL claims "precise lip-syncing" across multiple languages ([BFL](https://bfl.ai/blog/flux-3-video)).
- Shot progression from ordered keyframes: BFL supports a start frame, an end frame and multiple keyframes in order ([BFL](https://bfl.ai/models/flux-3-video)).
- Text that sits in the scene: BFL cites "Typography that feels native to the scene" ([BFL](https://bfl.ai/models/flux-3-video)).
- Multi-shot clips with scene and camera-angle switches ([BFL](https://bfl.ai/blog/flux-3-video)).

## How to use FLUX 3 in Sloosh

1. Open [Video in Studio](https://sloosh.ai/studio/video?video-model=flux-3) with FLUX 3 in the model chip.
2. Add what you have: a start frame and optional end frame, and up to 8 reference images.
3. Pick the length (5 to 20 seconds), 720p or 1080p, and the aspect ratio.
4. Leave sound on or switch it off.
5. Write the prompt and press Generate; the price shows first.

## FLUX 3 prompting tips

- BFL says the model "Handles simple or complex prompts"; short prompts can be enough thanks to its world knowledge ([BFL](https://bfl.ai/models/flux-3-video), [BFL](https://bfl.ai/blog/flux-3-video)).
- Use keyframes in order to control how the shot progresses ([BFL](https://bfl.ai/models/flux-3-video)).
- For longer stories, chain clips: use the last frame of one clip as the start frame of the next ([BFL](https://bfl.ai/models/flux-3-video)).

## FLUX 3 example prompts

**Prompt 1**

```text
A street food vendor in Bangkok flips noodles in a flaming wok at night, then hands the plate to a customer and says, "Enjoy!" Handheld medium shot, neon light. Sound: sizzling wok, traffic, crowd chatter.
```

**Prompt 2**

```text
Starting on the start frame of the sealed coffee bag, the bag opens and beans spill across the counter, ending on the end frame of a full cup. Slow push-in, warm morning light. Sound: rustling paper, beans scattering, a pour.
```

**Prompt 3**

```text
Shot 1: wide view of a mountain cabin at dawn. Shot 2: close-up of a hand lighting the stove inside. Shot 3: the window fogging as the kettle boils. Sound: wind, a match strike, a kettle whistle.
```

## How it compares in Sloosh

|   | FLUX 3 | Kling 4.0 | Gemini Omni 1.1 Flash |
| --- | --- | --- | --- |
| Length | 5 to 20 s | 5, 10, 15, 30 s | 3 to 10 s |
| References | 8 images | 10 images, 5 videos | 6 images, 1 video (10 s) |
| Resolution | 720p, 1080p | 720p, 1080p | 360p to 4K |
| Ratios | 6, incl. 21:9 | 5, incl. 21:9 | 16:9, 9:16 |
| Sound | optional | always | always |

## Where else it runs

- Black Forest Labs API, from 4 Aug 2026 ([BFL](https://bfl.ai/blog/flux-3-video)).

## Frequently asked questions

### What is FLUX 3?

Black Forest Labs' multimodal model for video, audio, images and action ([BFL](https://bfl.ai/blog/flux-3)). In Sloosh, FLUX 3 is the video model with sound.

### Does FLUX 3 make video?

Yes. FLUX 3 Video generates clips up to 20 seconds with native audio ([BFL](https://bfl.ai/blog/flux-3-video)).

### How long can a FLUX 3 video be?

5 to 20 seconds in Sloosh.

### What resolution is FLUX 3 video?

720p or 1080p in Sloosh. BFL says Full HD is made by upscaling ([BFL](https://bfl.ai/blog/flux-3-video)).

### Does FLUX 3 have sound?

Yes, on by default; you can switch it off in Sloosh.

### Is FLUX 3 free?

Not for free: Sloosh has no free plan, so each FLUX 3 clip is paid from your plan. Any current offer shows on [pricing](https://sloosh.ai/pricing), and Studio shows the exact price before you generate. Your first Sloosh workspace gets 20 starter credits once, so you can try it before you pay.

### Is FLUX 3 the same as FLUX 3 Image?

No. Sloosh lists FLUX 3 Image as a separate image model.

## Related

- Models: [Kling 4.0](https://sloosh.ai/models/kling-4.0), [Gemini Omni 1.1 Flash](https://sloosh.ai/models/gemini-omni-1.1-flash), [Grok Imagine 1.5](https://sloosh.ai/models/grok-imagine-1.5)
- Spaces: [Cinematic Ad Sequence](https://sloosh.ai/spaces/cinematic-ad-sequence)
- Docs: [FLUX 3 Image](https://sloosh.ai/docs/flux-3-image.md)
- Answers: [What is the best AI video model in 2026?](https://geo.sloosh.ai/posts/what-is-the-best-ai-video-model-in-2026)

## Sources

- [BFL: FLUX 3 Video, Part 1: Generation](https://bfl.ai/blog/flux-3-video)
- [BFL: FLUX 3 video model page](https://bfl.ai/models/flux-3-video)
- [BFL: Release notes](https://docs.bfl.ai/release-notes)
- [BFL: FLUX 3](https://bfl.ai/blog/flux-3)