Runway Gen-4.5

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

execute_forge({
  "base_model_id": "runway-gen4.5",
  "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/runway-gen4-5/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_720pLANDSCAPE_16_9_720p, PORTRAIT_9_16_720p, SQUARE_720p

The shape and size of the output.

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.

guidance_file_first_frame

file[]required

The frame the video starts on

prompt_language

string

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