AvatalkAudio-Driven Lip-Sync Avatar for Long Video Generation
Avatalk is a state-of-the-art lip-sync video generation model trained on the open-source LongCat Avatar architecture. Designed specifically for long-duration video generation, Avatalk delivers super-realistic lip synchronization, natural human dynamics, and long-term identity consistency even across infinite-length video sequences.
It is an independent platform that provides access to AI models through its own APIs. It is not affiliated with other artificial intelligence models.
Key Features of Avatalk
Built for creators who demand professional quality without the complexity.
Unified Multi-Mode Generation
Avatalk supports Audio-Text-to-Video (AT2V), Audio-Text-Image-to-Video (ATI2V), and Audio-conditioned Video Continuation within a single unified framework, making it extremely flexible for both creative and production-level workflows.
Long-Sequence Stability at Scale
Through Cross-Chunk Latent Stitching, Avatalk prevents pixel degradation and visual noise accumulation, ensuring seamless quality across long videos without quality collapse.
Natural Human Dynamics Beyond Speech
The Disentangled Unconditional Guidance mechanism decouples audio signals from motion dynamics. As a result, Avatalk produces natural gestures, idle movements, and expressive behavior even during silent segments.
Identity Preservation Without Copy-Paste Artifacts
With Reference Skip Attention, Avatalk maintains character identity while avoiding the rigid "copy-paste" appearance seen in reference-heavy models.
Multi-Character & Infinite-Length Support
Avatalk natively supports multi-person interactions and theoretically infinite-length video generation, making it suitable for complex conversations and long-form content.
Efficient High-Resolution Inference for Production Deployment
Leveraging a coarse-to-fine generation strategy and Block Sparse Attention, Avatalk achieves fast 720p/30fps video synthesis while maintaining visual fidelity, enabling rapid iteration and scalable deployment across long or complex video tasks.
What is Avatalk?
Avatalk is an audio-driven lip-sync video generation model built and fine-tuned upon the open-source LongCat Avatar model. By extending LongCat Avatar's powerful video generation backbone, Avatalk pushes the boundaries of realism, temporal stability, and expressive motion, making it the ideal engine for next-generation AI presenters, virtual humans, digital actors, and multi-character conversational avatars.
Whether your video lasts one minute or one hour, Avatalk maintains visual consistency from the first frame to the last.
Avatalk Use Cases
Discover how Avatalk transforms audio into realistic, long-duration lip-sync video content across diverse applications.
Actor / Actress
Generate expressive performances with perfectly synchronized lip movements and consistent facial identity across long cinematic scenes powered by Avatalk.
Singer
Create rhythm-aware body motion aligned with vocals with Avatalk, producing engaging musical performances without motion degradation.
Podcast & Long Interviews
Avatalk supports hours-long speaking videos while maintaining consistent appearance, natural gestures, and visual clarity.
Sales & Corporate Presentations
Produce professional AI presenters with Avatalk that handle silent moments naturally, avoiding awkward pauses or robotic stillness.
Multi-Character Conversations
Avatalk generates synchronized lip-sync videos for multiple speakers with accurate turn-taking, individual identity preservation, and natural group dynamics.
Advantages of Avatalk
Built on Open-Source SOTA: LongCat Avatar
Avatalk is trained on the open-source LongCat Avatar model, which ranks #1 in overall anthropomorphism for both single-person and multi-person scenarios in EvalTalker evaluations, validated by 492 participants and multiple independent raters. Avatalk inherits this state-of-the-art foundation and extends it further for production deployment.
Designed for Long-Form Lip-Sync Content
Unlike short-clip-focused models, Avatalk is built specifically for long-form video generation, eliminating drift, jitter, and motion collapse across extended sequences.
More Expressive Than Traditional Avatar Models
Thanks to disentangled motion modeling, Avatalk generates richer body language and facial expressions rather than stiff, speech-only movements.
Production-Ready Architecture
Support for multiple generation modes and stable long sequences makes Avatalk suitable for commercial, research, and SaaS deployments.
How to Use Avatalk
Create long-form audio-driven lip-sync avatar videos with Avatalk in three simple steps.
Upload Audio & Reference
Upload your audio file (speech, music, or podcast) and optionally provide a reference image or text description. Avatalk supports AT2V (Audio-Text-to-Video), ATI2V (Audio-Text-Image-to-Video), and audio-conditioned video continuation modes.
Configure Generation Settings
Select your generation mode and configure settings for long-form video generation. Choose video length, resolution (up to 720p/30fps), and specify if you need multi-person support or infinite-length sequences. The model handles long-duration content without quality degradation.
Generate Your Avatalk Lip-Sync Video
Click "Generate" and Avatalk creates your video with perfect lip synchronization, natural gestures, and consistent identity. The model maintains visual quality across long sequences, generating expressive motion even during silent segments. Your realistic avatar video is ready for production use.
Choose Your Avatalk Credit Pack
Get credits to create high-quality lip-sync videos from audio and images in minutes with Avatalk. All plans include ultra HD quality, lightning-fast generation, multi-shot storytelling, and one-time payment.
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FAQs about Avatalk
Everything you need to know about Avatalk.
Avatalk is an audio-driven lip-sync video generation model trained on the open-source LongCat Avatar model, designed for super-realistic, long-form video generation with stable identity and natural motion.
Avatalk supports AT2V, ATI2V, and audio-conditioned video continuation.
Avatalk is built and fine-tuned upon the open-source LongCat Avatar model. It extends LongCat Avatar's core architecture with optimizations for production deployment, long-sequence stability, and enhanced lip-sync precision.
Avatalk offers better long-sequence stability, more natural motion, and avoids rigid copy-paste artifacts.
Yes, Avatalk is specifically optimized for long-duration and infinite-length video generation.
Yes, multi-person lip-sync scenarios are natively supported in Avatalk.
Through Cross-Chunk Latent Stitching, which eliminates redundant VAE decode-encode cycles.
Yes, Avatalk generates natural gestures and idle movements even without speech.
Avatalk is a proprietary model trained on the open-source LongCat Avatar. The underlying LongCat Avatar base model is open source.
Media, entertainment, education, marketing, sales, and virtual human platforms.
Absolutely. Avatalk's stability and flexibility make it ideal for commercial SaaS deployment.