WaveSpeed AI Longcat Avatar 1.5 API

LongCat Avatar 1.5

LongCat Avatar 1.5 is an upgraded audio-driven avatar video model that turns a single photo into a realistic speaking or singing video. It delivers sharper lip sync, faster generation, natural head and body motion, and strong identity preservation, making it suitable for talking portraits, virtual presenters, short-form content, and avatar-driven storytelling.

Why Choose This?

Sharper lip synchronization Aligns mouth movement closely with the input audio for more natural speech and singing performance.
Natural full-body coherence Goes beyond lip motion to preserve believable head movement, facial expression, and body posture.
Strong identity preservation Maintains facial identity and overall visual consistency across frames.
Photo-to-avatar video Turns a static image into a lively speaking or singing performance.
Improved generation speed Faster than earlier LongCat avatar workflows while keeping strong realism.
Production-ready workflow Suitable for presenter videos, talking portraits, creator content, and personalized avatar clips.

Parameters

Parameter	Required	Description
audio	Yes	Audio file used to drive the speaking or singing performance.
image	Yes	Source portrait image of the person to animate.
prompt	No	Prompt to guide expression, style, pose, or motion behavior.
resolution	No	Output resolution: `480p` or `720p`.
seed	No	Random seed for reproducibility. Use a fixed value when you want more consistent results.

How to Use

Upload the audio — provide the voice or singing track to drive the avatar.
Upload the image — add the portrait photo of the person you want to animate.
Add a prompt — guide expression, pose, or visual style if needed.
Choose resolution — select 480p or 720p depending on quality and budget needs.
Set a seed (optional) — use a fixed value for more reproducible generations.
Submit — run the model and download the generated avatar video.

Example Prompt

Natural speaking performance with subtle head movement, calm expression, realistic lip sync, and stable identity.

Pricing

Pricing depends on output length and resolution.

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

Billing Rules

480p costs $0.15 per 5 seconds
720p costs $0.30 per 5 seconds
Standard rate at 480p is $0.03 per second
720p is 2× the standard rate, or $0.06 per second
All videos are billed for a minimum of 5 seconds
Billing is capped at 30 seconds
Audio longer than 30 seconds is automatically trimmed

Best Use Cases

Talking portrait videos — Animate a still portrait into a speaking clip.
Virtual presenters — Create avatar-led explainers, intros, and business presentations.
Singing avatar content — Turn a portrait into a lip-synced singing performance.
Short-form creator videos — Produce avatar content for social media and promotional clips.
Personalized spokesperson media — Generate custom speaking videos without filming.

Pro Tips

Use a clear, front-facing portrait for better facial stability.
Upload clean audio for stronger lip sync and more natural rhythm.
Keep prompts simple and focused on expression or motion style.
Use 720p when realism matters more, and 480p when you want lower cost.
Reuse the same seed when comparing prompt variations on the same portrait.

Notes

Maximum clip length per job is 30 seconds
Audio longer than 30 seconds is automatically trimmed
Generation time is typically around 10–30 seconds of wall time per 1 second of video, depending on resolution and queue load
Better source portraits and cleaner audio generally improve overall quality

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 API — Quick start

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

HTTP example

# Submit the prediction
curl -X POST "https://api.wavespeed.ai/api/v3/wavespeed-ai/longcat-avatar-1.5" \
  -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-1.5", {
        "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-1.5",
    {
    "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 1.5 API — Frequently asked questions

What is the Longcat Avatar 1.5 API?

Longcat Avatar 1.5 is a WaveSpeedAI model for talking-avatar generation, exposed as a REST API on WaveSpeedAI. LongCat Avatar 1.5 is the upgraded LongCat Avatar with sharper lip sync and faster generation. Converts one photo + audio into audio-driven talking or singing avatar videos (Image-to-Video), capped at 30 seconds per clip, 720p tier $0.30/5s. 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 1.5 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.

How much does Longcat Avatar 1.5 cost per run?

Longcat Avatar 1.5 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 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-1.5.

How do I get started with the Longcat Avatar 1.5 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 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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