WaveSpeed AI LongCat Avatar 1.5 Multi API

LongCat Avatar 1.5 Multi

What is LongCat Avatar 1.5 Multi?

LongCat Avatar 1.5 Multi animates a single image containing two people from two distinct audio tracks, producing super-realistic, lip-synchronized multi-character video with natural dynamics and identity preserved across frames.

Why it looks great

Per-speaker lip sync: each speaker's mouth tracks its own audio precisely.
Full-body coherence: head motion, facial expressions, and posture align with the assigned audio for each speaker.
Identity preservation: both faces remain visually consistent throughout the clip.
Flexible turn-taking: choose between simultaneous speech and ordered turn-taking via the order parameter.

Pricing

Output Resolution	Cost per 5 seconds	Max Length
480p	$0.15	30 seconds
720p	$0.30	30 seconds

Billing Rules

Standard Rate: $0.03 per second
HD (720p) Rate: $0.06 per second (Double the Standard Rate)
Minimum Charge: All videos are billed for a minimum of 5 seconds (costing at least $0.15).
Billing Cap: Billing is capped at 30 seconds.
order=meanwhile: billed by max(left_audio_duration, right_audio_duration).
order=left_right / right_left: billed by left_audio_duration + right_audio_duration (both audios played sequentially).

How to Use

Upload the left_audio and right_audio files.
Upload your image (it should clearly show two people, left and right).
Select the speaking order (left_right, right_left, or meanwhile).
Select the resolution (480p or 720p).
(Optional) Add a prompt to guide expression, style, or pose.
Submit the job and download the result once it's ready.

Note

Max clip length per job: up to 30 seconds. Longer audio is automatically trimmed.
Processing speed: approximately 10-30 seconds of wall time per 1 second of video (varies by resolution and queue load).

More Versions

Single-character version

Related Models

InfiniteTalk — Higher-end avatar video workflow for more advanced speaking performance.
InfiniteTalk Multi — Multi-character avatar workflow for more complex scenes.

Longcat Avatar 1.5 Multi API — Quick start

Grab a WaveSpeedAI API key, then call POST https://api.wavespeed.ai/api/v3/wavespeed-ai/longcat-avatar-1.5/multi 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 1.5 Multi below.

HTTP example

# Submit the prediction
curl -X POST "https://api.wavespeed.ai/api/v3/wavespeed-ai/longcat-avatar-1.5/multi" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $WAVESPEED_API_KEY" \
  -d '{
    "image": "https://example.com/your-input.jpg",
    "prompt": "A cinematic shot of a city at sunset, soft golden light",
    "order": "meanwhile",
    "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-1.5/multi", {
        "image": "https://example.com/your-input.jpg",
        "prompt": "A cinematic shot of a city at sunset, soft golden light",
        "order": "meanwhile",
        "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-1.5/multi",
    {
    "image": "https://example.com/your-input.jpg",
    "prompt": "A cinematic shot of a city at sunset, soft golden light",
    "order": "meanwhile",
    "resolution": "480p",
    "seed": -1
}
)

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

Longcat Avatar 1.5 Multi API — Frequently asked questions

What is the Longcat Avatar 1.5 Multi API?

Longcat Avatar 1.5 Multi is a WaveSpeedAI model for talking-avatar generation, exposed as a REST API on WaveSpeedAI. LongCat Avatar 1.5 Multi converts a single image and two audio inputs into multi-character talking or singing videos at up to 720p, capped at 30 seconds per clip. 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 1.5 Multi 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-1.5-multi.

How much does Longcat Avatar 1.5 Multi cost per run?

Longcat Avatar 1.5 Multi starts at $0.15 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 1.5 Multi accept?

Key inputs: `prompt`, `image`, `resolution`, `seed`, `left_audio`, `order`. 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-1.5-multi.

How do I get started with the Longcat Avatar 1.5 Multi API?

Sign up for a free WaveSpeedAI account to claim starter credits, copy your API key from /accesskey, then call the endpoint shown in the API tab of the playground. The playground also auto-generates a code sample in Python, JavaScript, or cURL for the parameters you've set.

Can I use Longcat Avatar 1.5 Multi 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.

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