FLUX.3 API

Black Forest Labs FLUX.3 image-to-video with native audio.

Endpoint

POST https://api.hedra.com/v3/models/flux-3

Example request

curl -X POST "https://api.hedra.com/v3/models/flux-3" \
  -H "Authorization: Key $HEDRA_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"input": {"prompt": "a cinematic shot of a city at dusk"}}'

Parameters

num_outputsinteger

Number of outputs generated per job. Only 1 is supported.

promptstringrequired

Generation prompt.

aspect_ratiostringrequired

Output aspect ratio.

resolutionstringrequired

Output resolution.

duration_msintegerrequired

Duration in ms.

generate_audioboolean

Whether to generate native audio for the video.

start_image

Start frame (image-to-video). At most 10.4 MB.

end_image

End frame (first-last-frame-to-video). At most 10.4 MB.