Use RunComfy's API to run lightricks/ltx-2.5/audio-to-video/fast. For accepted inputs and outputs, see the model's schema.
curl --request POST \
--url https://model-api.runcomfy.net/v1/models/lightricks/ltx-2.5/audio-to-video/fast \
--header "Content-Type: application/json" \
--header "Authorization: Bearer <token>" \
--data '{
"audio_url": "https://playgrounds-storage-public.runcomfy.net/tools/7418/media-files/input-audio.mp3"
}'Set the YOUR_API_TOKEN environment variable with your API key (manage keys in your Profile) and include it on every request as a Bearer token via the Authorization header: Authorization: Bearer $YOUR_API_TOKEN.
Submit an asynchronous generation job and immediately receive a request_id plus URLs to check status, fetch results, and cancel.
curl --request POST \
--url https://model-api.runcomfy.net/v1/models/lightricks/ltx-2.5/audio-to-video/fast \
--header "Content-Type: application/json" \
--header "Authorization: Bearer <token>" \
--data '{
"audio_url": "https://playgrounds-storage-public.runcomfy.net/tools/7418/media-files/input-audio.mp3"
}'Fetch the current state for a request_id ("in_queue", "in_progress", "completed", or "cancelled").
curl --request GET \
--url https://model-api.runcomfy.net/v1/requests/{request_id}/status \
--header "Authorization: Bearer <token>"Retrieve the final outputs and metadata for the given request_id; if the job is not complete, the response returns the current state so you can continue polling.
curl --request GET \
--url https://model-api.runcomfy.net/v1/requests/{request_id}/result \
--header "Authorization: Bearer <token>"Cancel a queued job by request_id; in-progress jobs cannot be cancelled.
curl --request POST \
--url https://model-api.runcomfy.net/v1/requests/{request_id}/cancel \
--header "Authorization: Bearer <token>"Provide a publicly reachable HTTPS URL. Ensure the host allows server-side fetches (no login/cookies required) and isn't rate-limited or blocking bots. Recommended limits: images ≤ 50 MB (~4K), videos ≤ 100 MB (~2–5 min @ 720p). Prefer stable or pre-signed URLs for private assets.
{
"type": "object",
"title": "Input schema",
"required": [
"audio_url"
],
"properties": {
"audio_url": {
"title": "Audio URL",
"description": "URL of the audio file to drive the video. Duration must be between 2 and 20 seconds.",
"type": "string",
"default": "https://playgrounds-storage-public.runcomfy.net/tools/7418/media-files/input-audio.mp3"
},
"image_url": {
"title": "Image URL (optional)",
"description": "Optional first-frame image. If omitted, prompt is required.",
"type": "string",
"default": "https://playgrounds-storage-public.runcomfy.net/tools/7418/media-files/input-1.webp"
},
"prompt": {
"title": "Prompt",
"description": "Describe how the video should look and move with the audio. Required if no image is provided.",
"type": "string",
"default": "The vocalist sings into the ribbon microphone, eyes half-closed, subtle head movement matching the phrasing; soft side key light, slow push-in. Clean studio realism. No text, no watermark."
},
"guidance_scale": {
"title": "Guidance Scale",
"description": "How closely the video follows the prompt. Higher values stick more tightly to the text.",
"type": "number",
"minimum": 1,
"maximum": 50,
"default": 9
},
"aspect_ratio": {
"title": "Aspect Ratio",
"description": "Output aspect ratio. auto follows the input image, or defaults toward 16:9 without an image.",
"type": "string",
"enum": [
"auto",
"16:9",
"9:16"
],
"default": "auto"
}
}
}{
"output": {
"type": "object",
"properties": {
"image": {
"type": "string",
"format": "uri",
"description": "single image URL"
},
"video": {
"type": "string",
"format": "uri",
"description": "single video URL"
},
"images": {
"type": "array",
"description": "multiple image URLs",
"items": {
"type": "string",
"format": "uri"
}
},
"videos": {
"type": "array",
"description": "multiple video URLs",
"items": {
"type": "string",
"format": "uri"
}
}
}
}
}RunComfy is the premier ComfyUI platform, offering ComfyUI online environment and services, along with ComfyUI workflows featuring stunning visuals. RunComfy also provides AI Models, enabling artists to harness the latest AI tools to create incredible art.