About Avatalk

What is Avatalk?

Avatalk is a professional AI lip-sync video generation platform built and fine-tuned upon LongCat-Video-Avatar, an open-source audio-driven character animation model developed by the Meituan LongCat Team. By extending the powerful LongCat-Video-Avatar architecture, Avatalk delivers a production-ready, cloud-based experience for creators, developers, and enterprises who need super-realistic, long-form avatar video generation without the complexity of running open-source models locally.

Avatalk inherits the state-of-the-art capabilities of LongCat-Video-Avatar and wraps them in an accessible, scalable platform designed for real-world deployment.

Our Technology Foundation: LongCat-Video-Avatar

Avatalk is proudly built upon LongCat-Video-Avatar, a unified open-source model that delivers expressive and highly dynamic audio-driven character animation. The underlying model supports native tasks including Audio-Text-to-Video, Audio-Text-Image-to-Video, and Video Continuation, with seamless compatibility for both single-stream and multi-stream audio inputs.

LongCat-Video-Avatar is released under the MIT License by the Meituan LongCat Team, and Avatalk is an independent platform that builds upon this open-source foundation to provide API access, cloud inference, and a user-friendly interface. Avatalk is not affiliated with Meituan or the LongCat Team.

Key Capabilities of Avatalk

Avatalk exposes the full power of LongCat-Video-Avatar through a streamlined platform experience.

  • Unified Multi-Task Generation: Avatalk supports Audio-Text-to-Video (AT2V), Audio-Text-Image-to-Video (ATI2V), and Video Continuation within a single unified framework, natively handling all tasks with consistent, high-quality output across each scenario.
  • Audio-Driven Lip-Sync Animation: Avatalk is specifically designed for expressive, highly dynamic audio-driven character animation, enabling natural lip synchronization and character movements that match audio inputs with frame-level precision.
  • Single & Multi-Stream Audio Support: The Avatalk engine seamlessly supports both single-stream and multi-stream audio inputs, enabling flexible animation scenarios including synchronized dialogue between multiple characters in a single video.
  • Long-Form Video Generation: Avatalk inherits the long video generation capabilities from the LongCat-Video backbone, enabling minutes-long videos without color drifting, identity drift, or quality degradation across extended sequences.
  • Efficient Cloud Inference: Avatalk delivers high-quality video generation within minutes by leveraging a coarse-to-fine generation strategy along both the temporal and spatial axes, making production-scale deployment practical and cost-effective.

Why Avatalk

The open-source LongCat-Video-Avatar model represents the state of the art in audio-driven avatar generation, ranking #1 in overall anthropomorphism for both single-person and multi-person scenarios in EvalTalker evaluations, validated by 492 participants and multiple independent raters. However, running it locally requires significant GPU resources, complex environment setup, and ongoing maintenance.

Avatalk solves this by providing:

  • Cloud-based inference — no local GPU required
  • Simple upload-and-generate workflow — no command-line setup
  • 480p / 720p / 1080p resolution options — production-ready output
  • Multi-character support — dual-audio lip-sync out of the box
  • Credit-based pricing — flexible, pay-as-you-go access

Open-Source Model Reference

Avatalk is built upon the following open-source model:

LongCat-Video-Avatar Developed by the Meituan LongCat Team. Released under the MIT License. Model available on Hugging Face: meituan-longcat/LongCat-Video-Avatar

If you use the underlying LongCat-Video-Avatar model in your own research or projects, the original authors kindly encourage citation:

@misc{meituanlongcatteam2025longcatvideoavatartechnicalreport,
      title={LongCat-Video-Avatar Technical Report},
      author={Meituan LongCat Team},
      year={2025},
      eprint={},
      archivePrefix={arXiv},
      primaryClass={cs.CV},
      url={},
}

Usage Considerations

Avatalk is designed for legitimate creative, educational, and commercial use cases. As with all AI-generated content tools, users are responsible for ensuring their use complies with all applicable laws and regulations, including data protection, privacy, and content safety requirements. Avatalk does not endorse or support the use of AI-generated video for deceptive, harmful, or unauthorized purposes.

Contact

For support, partnership inquiries, or API access, reach out to us at support@longcatavatar.com.