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Use Runway models through CometAPI to generate images, create or edit video, produce speech and sound effects, or process audio. Every creation request returns a task id; use the task endpoint to retrieve status and output URLs.

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Choose a model and endpoint

The following models are available through these Runway endpoints. Each linked reference describes the parameters for its models. gen4.5 supports both text-to-video and image-to-video requests. gen4_turbo uses image-to-video requests. seed_audio has different input fields for sound effects and text-to-speech; follow the selected endpoint’s model variant.

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Create a task and retrieve the result

1

Choose the endpoint and model

Select the task above, then use the model-specific request schema and example on that endpoint page.
2

Send the request

Store your API key locally as $COMETAPI_KEY before running the examples. Send JSON to https://api.cometapi.com/runwayml/v1 followed by the endpoint path. Authenticate with Authorization: Bearer <COMETAPI_KEY>.
3

Save the task ID

Save the returned id for the task-retrieval request.
4

Retrieve the output

Use Get a Runway task with an API key from the same CometAPI account. When status is SUCCEEDED, download the assets listed in output and store them.
For media inputs, use accessible HTTPS URLs or the data URI format shown in the endpoint schema. Replace example media URLs with your own inputs when the example calls for a source video or audio file.
Last modified on September 21, 2026