FLUX 3

FLUX 3 is a multimodal model from Black Forest Labs that generates video with synchronized audio. You send a text prompt and, optionally, images or a video to drive the result.

Outputs are .mp4, at 720p or 1080p, 5 to 20 seconds, with audio by default.

What you can make

You always send a prompt. You can also attach one of:

• Nothing — the model generates the whole clip from your text (text-to-video).
• One image — your image opens the clip, shown pixel for pixel as the first frame.
• Two images — the first starts the clip and the second ends it.
• Three or more images (up to 10) — a storyboard: the first starts it, the last ends it, and the rest fall evenly in between (set a duration).
• start_video — continue a clip from its final frames.

Attach either images or a start video, not both.

Settings

• aspect_ratio — auto (default), or one of 21:9, 2:1, 16:9, 4:3, 1:1, 3:4, 9:16. auto picks a ratio from your prompt and inputs.
• resolution — 720p (default) or 1080p.
• duration — auto (default) or a whole number of seconds from 5 to 20.
• generate_audio — on by default. Turn it off for a silent clip.
• draft — generate a fast, low-cost 720p preview. Handy for iterating on a prompt before a full-quality run.
• safety_tolerance — moderation tolerance from 0 (strictest) to 4. Requests with image or video inputs are limited to 2.

About

FLUX 3 is built on Black Forest Labs’ Self-Flow architecture, a single multimodal flow-matching model trained across images, video, and audio.