PixVerse 5.5 transition: AI Image-to-Video with Sound & Morphing
Transform two still images into smooth cinematic videos with built-in sound, precise morphing, fast rendering, and adaptable styles for creative storytelling and professional visual production.
Table of contents
1. Get started
Use RunComfy's API to run pixverse/pixverse/v5.5/transition. For accepted inputs and outputs, see the model's schema.
curl --request POST \
--url https://model-api.runcomfy.net/v1/models/pixverse/pixverse/v5.5/transition \
--header "Content-Type: application/json" \
--header "Authorization: Bearer <token>" \
--data '{
"prompt": "Scene slowly transition, a cat jump to the cake",
"first_image_url": "https://playgrounds-storage-public.runcomfy.net/tools/7255/media-files/input-1-1.png",
"end_image_url": "https://playgrounds-storage-public.runcomfy.net/tools/7255/media-files/input-1-2.png"
}'2. Authentication
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.
3. API reference
Submit a request
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/pixverse/pixverse/v5.5/transition \
--header "Content-Type: application/json" \
--header "Authorization: Bearer <token>" \
--data '{
"prompt": "Scene slowly transition, a cat jump to the cake",
"first_image_url": "https://playgrounds-storage-public.runcomfy.net/tools/7255/media-files/input-1-1.png",
"end_image_url": "https://playgrounds-storage-public.runcomfy.net/tools/7255/media-files/input-1-2.png"
}'Monitor request status
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 request results
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 request
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>"4. File inputs
Hosted file (URL)
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.
5. Schema
Input schema
{
"type": "object",
"title": "Input",
"required": [
"prompt",
"first_image_url",
"end_image_url"
],
"properties": {
"prompt": {
"title": "Prompt",
"description": "",
"type": "string",
"default": "Scene slowly transition, a cat jump to the cake"
},
"aspect_ratio": {
"title": "Aspect Ratio (W:H)",
"description": "The aspect ratio of the generated video.",
"type": "string",
"enum": [
"16:9",
"4:3",
"1:1",
"3:4",
"9:16"
],
"default": "16:9"
},
"resolution": {
"title": "Resolution",
"description": "The resolution of the generated video.",
"type": "string",
"enum": [
"360p",
"540p",
"720p",
"1080p"
],
"default": "720p"
},
"duration": {
"title": "Duration",
"description": "The duration of the generated video in seconds. 1080p videos are limited to 5 or 8 seconds. Longer durations cost more.",
"type": "integer",
"enum": [
5,
8,
10
],
"default": 5
},
"negative_prompt": {
"title": "Negative Prompt",
"description": "",
"type": "string",
"default": ""
},
"style": {
"title": "Style",
"description": "The style of the generated video.",
"type": "string",
"enum": [
"anime",
"3d_animation",
"clay",
"comic",
"cyberpunk"
],
"default": "anime"
},
"seed": {
"title": "Seed",
"description": "",
"type": "integer",
"default": 0
},
"generate_audio_switch": {
"title": "Generate Audio",
"description": "Enable audio generation (BGM, SFX, dialogue).",
"type": "boolean",
"default": false
},
"thinking_type": {
"title": "Prompt Optimization",
"description": "Prompt optimization mode: 'enabled' to optimize, 'disabled' to turn off, 'auto' for model decision.",
"type": "string",
"enum": [
"enabled",
"disabled",
"auto"
],
"default": "auto"
},
"first_image_url": {
"title": "Start Image",
"description": "URL of the image to use as the first frame.",
"type": "string",
"default": "https://playgrounds-storage-public.runcomfy.net/tools/7255/media-files/input-1-1.png"
},
"end_image_url": {
"title": "End Image",
"description": "URL of the image to use as the last frame.",
"type": "string",
"default": "https://playgrounds-storage-public.runcomfy.net/tools/7255/media-files/input-1-2.png"
}
}
}Output schema
{
"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.