Use RunComfy's API to run lightricks/ltx-2.5/text-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/text-to-video/fast \
--header "Content-Type: application/json" \
--header "Authorization: Bearer <token>" \
--data '{
"prompt": "A jazz trio performs in a wood-paneled club: upright bass, brushed drums, and a trumpet player in a midnight-blue suit. Warm tungsten sconces, soft haze, audience silhouettes in the foreground. Slow lateral track left-to-right past the band, then a gentle push-in on the trumpet bell. Analog film grain, intimate documentary feel. Audio: live trumpet melody, soft brushwork, quiet room murmur. No text, no watermark."
}'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/text-to-video/fast \
--header "Content-Type: application/json" \
--header "Authorization: Bearer <token>" \
--data '{
"prompt": "A jazz trio performs in a wood-paneled club: upright bass, brushed drums, and a trumpet player in a midnight-blue suit. Warm tungsten sconces, soft haze, audience silhouettes in the foreground. Slow lateral track left-to-right past the band, then a gentle push-in on the trumpet bell. Analog film grain, intimate documentary feel. Audio: live trumpet melody, soft brushwork, quiet room murmur. No text, no watermark."
}'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": [
"prompt"
],
"properties": {
"prompt": {
"title": "Prompt",
"description": "Text prompt describing the video scene, motion, and audio.",
"type": "string",
"default": "A jazz trio performs in a wood-paneled club: upright bass, brushed drums, and a trumpet player in a midnight-blue suit. Warm tungsten sconces, soft haze, audience silhouettes in the foreground. Slow lateral track left-to-right past the band, then a gentle push-in on the trumpet bell. Analog film grain, intimate documentary feel. Audio: live trumpet melody, soft brushwork, quiet room murmur. No text, no watermark."
},
"duration": {
"title": "Duration",
"description": "Video length in seconds. Use auto to let the model choose from the prompt.",
"type": "string",
"enum": [
"auto",
"6",
"8",
"10",
"12",
"14",
"16",
"18",
"20"
],
"default": "10"
},
"resolution": {
"title": "Resolution",
"description": "Output resolution of the generated video.",
"type": "string",
"enum": [
"720p",
"1080p",
"1440p",
"2160p"
],
"default": "1080p"
},
"aspect_ratio": {
"title": "Aspect Ratio",
"description": "Output aspect ratio of the generated video.",
"type": "string",
"enum": [
"16:9",
"9:16"
],
"default": "16:9"
},
"fps": {
"title": "Frames per Second",
"description": "Frames per second of the generated video.",
"type": "integer",
"enum": [
24,
25,
48,
50
],
"default": 25
},
"generate_audio": {
"title": "Generate Audio",
"description": "Whether to generate synchronized audio with the video.",
"type": "boolean",
"default": true
},
"camera_motion": {
"title": "Camera Motion (optional)",
"description": "Optional camera motion preset. Leave unset for prompt-only camera direction.",
"type": "string",
"enum": [
"dolly_in",
"dolly_out",
"dolly_left",
"dolly_right",
"jib_up",
"jib_down",
"static",
"focus_shift"
]
}
}
}{
"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.