Longcat Avatar

What is LongCat Avatar?

LongCat Avatar is an audio-driven video generation model that produces super-realistic, lip-synchronized long video generation with natural dynamics and consistent identity. It converts static photos into lively speaking or singing videos with precise lip sync, aligning the head, face, and body movements to the audio.

Why it looks great

Accurate lip synchronization: aligns lip motion precisely with audio, preserving natural rhythm and pronunciation.
Full-body coherence: captures head movements, facial expressions, and posture changes beyond the lips.
Identity preservation: maintains consistent facial identity and visual style across frames.
Image-to-video capability: turns static photos into realistic speaking or singing videos.
Natural dynamics: produces unnoticeable color tone consistency and natural dynamics across multiple speaker scenarios.

Pricing

Output Resolution	Cost per 5 seconds	Max Length
480p	$0.20	2 minutes
720p	$0.40	2 minutes

Billing Rules

Standard Rate: $0.04 per second
HD (720p) Rate: $0.08 per second (Double the Standard Rate)
Minimum Charge: All videos are billed for a minimum of 5 seconds (costing at least $0.20).
Billing Cap: To keep your costs predictable, billing is capped at 120 seconds (2 minutes).

How to Use

Upload the audio file.
Upload the image (the person to animate).
(Optional) Add a prompt to guide expression, style, or pose.
Select the resolution (480p or 720p).
Set the seed (set a fixed number for reproducibility).
Submit the job and download the result once it's ready.

Note

Max clip length per job: up to 1 minute. Please keep your input within this limit — longer clips may lead to unstable or unpredictable results.
Processing speed: approximately 10-30 seconds of wall time per 1 second of video (varies by resolution and queue load)

Reference

LongCat-Video-Avatar Project

Want The Best Avatar Model?

Longcat Avatar API — Quick start

Grab a WaveSpeedAI API key, then call POST https://api.wavespeed.ai/api/v3/wavespeed-ai/longcat-avatar with your input as JSON. The endpoint returns a prediction id; poll the prediction endpoint until status flips to completed, then read the output URL from data.outputs[0]. Examples for Longcat Avatar below.

HTTP example

# Submit the prediction
curl -X POST "https://api.wavespeed.ai/api/v3/wavespeed-ai/longcat-avatar" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $WAVESPEED_API_KEY" \
  -d '{
    "image": "https://example.com/your-input.jpg",
    "audio": "https://example.com/your-audio.mp3",
    "prompt": "A cinematic shot of a city at sunset, soft golden light",
    "resolution": "480p",
    "seed": -1
}'

# Response includes a prediction id. Poll for the result:
curl -X GET "https://api.wavespeed.ai/api/v3/predictions/{request_id}/result" \
  -H "Authorization: Bearer $WAVESPEED_API_KEY"

# When status is "completed", read the output from data.outputs[0].

Node.js example

// npm install wavespeed
const WaveSpeed = require('wavespeed');

const client = new WaveSpeed(); // reads WAVESPEED_API_KEY from env

const result = await client.run("wavespeed-ai/longcat-avatar", {
        "image": "https://example.com/your-input.jpg",
        "audio": "https://example.com/your-audio.mp3",
        "prompt": "A cinematic shot of a city at sunset, soft golden light",
        "resolution": "480p",
        "seed": -1
});

console.log(result.outputs[0]); // → URL of the generated output

Python example

# pip install wavespeed
import wavespeed

output = wavespeed.run(
    "wavespeed-ai/longcat-avatar",
    {
    "image": "https://example.com/your-input.jpg",
    "audio": "https://example.com/your-audio.mp3",
    "prompt": "A cinematic shot of a city at sunset, soft golden light",
    "resolution": "480p",
    "seed": -1
}
)

print(output["outputs"][0])  # → URL of the generated output

Longcat Avatar API — Frequently asked questions

What is the Longcat Avatar API?

Longcat Avatar is a WaveSpeedAI model for talking-avatar generation, exposed as a REST API on WaveSpeedAI. LongCat Avatar produces super-realistic, lip-synchronized long video generation with natural dynamics and consistent identity. Converts one photo + audio into audio-driven talking or singing avatar videos (Image-to-Video), up to 2 minutes, 720p tier $0.40/5s. Ready-to-use REST API, no coldstarts, affordable pricing. You can call it programmatically or try it from the playground above.

How do I call the Longcat Avatar API?

POST your input parameters to the model's REST endpoint (shown in the API tab of this playground) with your WaveSpeedAI API key in the Authorization header. Submission returns a prediction ID; poll the prediction endpoint until status flips to "completed", then read the output URL from the result. The playground generates a ready-to-paste code sample in Python, JavaScript, or cURL for whatever inputs you've set. Full request/response shape is documented at https://wavespeed.ai/docs/docs-api/wavespeed-ai/longcat-avatar.

How much does Longcat Avatar cost per run?

Longcat Avatar starts at $0.20 per run. That figure is the base price — the final charge scales with the parameters you set in the form (output size, length, count, references, or whatever knobs this model exposes), so a higher-quality or larger output costs more than a minimal one. The exact cost for your current input is shown live next to the Generate button before you submit, and the actual per-call charge is recorded on the prediction afterwards.

What inputs does Longcat Avatar accept?

Key inputs: `prompt`, `image`, `audio`, `resolution`, `seed`. The full JSON schema (types, defaults, allowed values) is rendered above the Generate button and mirrored in the API reference at https://wavespeed.ai/docs/docs-api/wavespeed-ai/longcat-avatar.

How long does Longcat Avatar take to generate?

Average end-to-end generation time on WaveSpeedAI is around 328 seconds per request — measured across recent runs. Queue time scales with global demand; live status is visible in the prediction record.

Can I use Longcat Avatar outputs commercially?

Commercial usage rights depend on the model's license, set by its provider (WaveSpeedAI). The license summary appears on the model card above; see WaveSpeedAI's Terms of Service for platform-level conditions.

ExamplesView all

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LongCat Avatar