FLUX.3 Extend

https://mcp.app.layer.ai/mcp

execute_forge({
  "base_model_id": "flux-3-extend",
  "prompt": "A torch-lit dungeon corridor, slow dolly forward",
  "batch_size": 1,
  "duration_seconds": 5
})

# Start the generation — returns an inference id straight away.
curl -X POST https://api.app.layer.ai/api/v2/workspaces/$WORKSPACE_ID/base-models/bfl-flux-3-extend/inferences \
  -H "Authorization: Bearer $LAYER_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{
        "prompt": "A torch-lit dungeon corridor, slow dolly forward"
      }'

# Poll until status is "complete" — the response then carries the asset URLs.
curl https://api.app.layer.ai/api/v2/workspaces/$WORKSPACE_ID/inferences/$INFERENCE_ID \
  -H "Authorization: Bearer $LAYER_TOKEN"

prompt

stringrequired

Describe what to generate, or the change to make.

aspect_ratio

enumdefault LANDSCAPE_16_9_1080p15 options

The shape and size of the output. Auto follows the shape of the input.

seed

integer

The starting point for the model's randomness. The same seed and settings give the same result.

duration_seconds

integerdefault 5

Length of the generated clip, in seconds. Auto lets the model choose.

fps

stringdefault 24

Frames per second of the output video.

generate_audio

booleandefault false

Add sound, generated with the video in the same pass.

draft

booleandefault false

Render a quick, low-cost preview you can complete at full quality later.

guidance_file_init_video

file[]required

The video to modify

prompt_language

string

The language the prompt is written in, so it reaches the model as you meant it.