LongCat Single Avatar (Audio Only)

Generate realistic talking avatars from audio without needing a photo.

Input Audio

Prompt

"A person is talking naturally with natural expressions and movements."

Generated Video

Upload your video and sync lips in seconds

10,000+ generations this month

📄 About LongCat Single Avatar (Audio Only)

LongCat Single Avatar (Audio Only) is a cutting-edge AI model designed to transform audio recordings into ultra-realistic talking avatar videos without the need for custom images. Leveraging state-of-the-art audio-to-video generation technology, this model produces lifelike videos featuring precise lip synchronization, natural facial expressions, and dynamic movements—all driven solely by the provided audio input. Perfect for content creators, educators, marketers, and businesses, LongCat Single Avatar simplifies the process of creating engaging, personalized video content from voice recordings. The model's technology listens to your audio file and automatically generates a talking avatar that moves and speaks as if they are genuinely delivering your message. By utilizing advanced text and audio guidance scales, users can fine-tune the level of expressiveness, mouth movement, and video dynamics, ensuring the output matches their vision. The model supports resolutions of 480p for standard quality or 720p for high-definition results, and allows for the creation of videos in segments, making it easy to tailor content length for various platforms. Users can further guide the AI with text prompts that influence the avatar's demeanor, expression, and style, or use negative prompts to explicitly avoid unwanted visual artifacts or qualities. The system offers advanced customization for power users, including adjustable inference steps for balancing speed and quality, random seed options for reproducible results, and a built-in safety checker to ensure generated content meets safety and quality standards. Ideal use cases include creating talking head videos for social media, voiceover-driven explainer videos, virtual spokesperson content, and personalized video messages. The intuitive pay-as-you-go system means you only pay for what you use, making high-quality video creation accessible to both individual creators and large organizations. Whether you're producing educational materials, marketing videos, or engaging social content, LongCat Single Avatar streamlines the video creation process, saving time and resources while delivering professional results. Experience the next generation of audio-to-video AI, where your voice is all you need to bring digital avatars to life—no cameras, studios, or actors required. With LongCat Single Avatar, creating compelling, lip-synced video content has never been easier or more accessible.

✨ Key Features

Transforms any audio file into a super-realistic, lip-synced talking avatar video—no custom images required.

Advanced natural expressions and facial dynamics for engaging, lifelike video output.

Customizable with text prompts and negative prompts to fine-tune avatar behavior and eliminate unwanted traits.

Supports both 480p (standard) and 720p (HD) resolutions for flexible video quality.

Segmented video generation allows for extended content and precise timing.

Adjustable inference steps and guidance scales for advanced users seeking optimal control over output.

Built-in safety checker to ensure content quality and compliance.

💡 Use Cases

⚡Creating voice-driven explainer or training videos for e-learning platforms.

⚡Producing engaging spokesperson videos for marketing and sales presentations.

⚡Generating personalized avatar video messages for customer communication.

⚡Enhancing podcasts or audio stories with dynamic talking head visuals.

⚡Developing virtual news anchors or automated host videos for digital media.

⚡Creating social media video content from voice notes or scripts.

⚡Rapid prototyping of video concepts without expensive filming or actors.

🎯 Best For

🎯 Content creators, marketers, educators, and businesses seeking quick, realistic talking avatar videos from audio input.

👍 Pros

✓No need for custom images or video recording—audio input alone creates compelling videos.

✓Highly realistic lip syncing and facial movements enhance viewer engagement.

✓Flexible customization options for both basic and advanced users.

✓Quick turnaround times for generating video segments.

✓Pay-as-you-go system provides cost-effective scalability.

⚠️ Considerations

△Limited avatar variety—does not support custom avatars or multiple faces.

△Visuals are entirely AI-generated, so may lack personal or branded likeness.

△Requires clear audio input for best results.

△Advanced settings may require some experimentation for optimal output.

📚 How to Use LongCat Single Avatar (Audio Only)

Prepare your audio file or provide a direct audio URL for upload.

Optionally, enter a text prompt to guide the avatar’s expressions and actions.

Set your desired video resolution (480p or 720p) and select the number of video segments.

Adjust advanced settings like inference steps or guidance scales if needed, or use the defaults for quick results.

Submit your job and wait for the AI to generate your talking avatar video.

Download and review your generated video, making adjustments as needed for future runs.

💡 Pro Tips for LongCat Single Avatar (Audio Only)

★

Record Clean Audio for Best Lip Sync The model's lip sync accuracy depends heavily on audio clarity. Record in a quiet environment with minimal background noise, and speak at a natural, consistent pace. Avoid music overlays or ambient sounds during speech segments. If you need to add background music, layer it in post-production after the avatar video is generated. Clear voice input ensures the AI can accurately map phonemes to mouth movements, resulting in realistic, professional-looking output.

★

Use Text Prompts to Shape Avatar Personality While the model generates avatars from audio alone, your text prompt significantly influences the avatar's demeanor and visual style. Describe the mood, expression, and body language you want—such as 'A confident business professional speaking with warm, friendly expressions' or 'A calm educator explaining concepts with thoughtful gestures.' Experiment with different descriptors to find the tone that matches your brand or message. This level of control sets it apart from simpler audio-to-video tools.

★

Start with 480p to Test, Scale to 720p Resolution directly impacts both credit cost and generation time—480p costs 1 credit per second, while 720p costs 4 credits per second. For initial tests or social media content where file size matters, start with 480p to iterate quickly and affordably. Once you've dialed in your prompt and audio, upgrade to 720p for final deliverables, presentations, or YouTube content. This two-phase approach saves credits while ensuring your final output meets quality standards.

★

Leverage Negative Prompts to Avoid Common Artifacts The default negative prompt already excludes many unwanted elements like blurred details, extra fingers, and static images. Customize it further based on your results—if you notice specific issues like unnatural head tilts, overly bright lighting, or distracting backgrounds, add those descriptors to the negative prompt. This proactive filtering helps the AI focus on generating clean, professional avatars without requiring multiple re-runs. It's particularly useful for corporate or educational content where polish matters.

★

Adjust Audio Guidance Scale for Expression Control The audio guidance scale parameter (default 4) controls how exaggerated the avatar's mouth movements are. If lip sync appears too subtle or understated, increase the value toward 8-10 for more pronounced articulation. Conversely, if movements look overdone or cartoonish, reduce it to 2-3 for subtlety. This fine-tuning is especially valuable for different content types—educational videos often benefit from clearer mouth movements, while conversational content may need a softer touch.

★

Compare with Image-Based Models for Custom Avatars If you need a specific face or branded spokesperson, consider LongCat Single Avatar (Image + Audio) or HeyGen Digital Twin Avatar V4, which let you provide a reference photo. This audio-only model excels when you want fast, generic avatars without sourcing or creating custom images—ideal for rapid prototyping, anonymous voiceovers, or scenarios where brand identity isn't tied to a specific face. Choose based on whether you need speed and simplicity or personalized branding.

Ready to try LongCat Single Avatar (Audio Only)?

Get 10 free credits — no credit card required

Start Free →

Frequently Asked Questions

The model analyzes your audio input to create a talking avatar video that mimics lip movements and natural facial expressions corresponding to the speech. No image or video source is required—everything is generated by AI.

No, LongCat Single Avatar creates a default, highly realistic avatar based solely on your audio. It does not currently support custom avatars or images.

You can choose between 480p (standard) and 720p (HD) resolutions, allowing flexibility based on your quality and file size needs.

Yes, the model includes a built-in safety checker to help ensure that generated videos meet content and quality standards before being delivered.

Pricing varies by model and is based on a pay-as-you-go credit system, so you only pay for the video generation resources you use.

Credit consumption depends on resolution and video length. At 480p, the model uses approximately 1 credit per second of generated video. At 720p, it consumes roughly 4 credits per second. The first segment generates about 5.8 seconds, and each additional segment adds 5 seconds. For example, a 10-second 480p video costs around 10 credits, while the same length at 720p costs about 40 credits. Generation time typically ranges from 25-50 seconds regardless of resolution. Always check your credit balance before starting longer projects, and consider testing with 480p first to validate your audio and prompts before committing to higher-resolution renders.

Yes, all videos generated with paid credits on JAI Portal come with full commercial-use rights, including content created with LongCat Single Avatar. You can use the output in marketing campaigns, client deliverables, social media ads, educational courses, YouTube monetized content, and any other commercial application. There are no additional licensing fees or attribution requirements beyond the credit cost of generation. This makes the model ideal for agencies, freelancers, and businesses producing spokesperson videos, explainer content, or automated video messaging at scale. Always ensure your input audio complies with applicable copyright and voice rights laws.

LongCat Single Avatar accepts standard audio formats including MP3, WAV, M4A, and other common types via direct upload or URL. The model is language-agnostic and works with any spoken language, as it analyzes phonetic patterns and speech cadence rather than linguistic content. However, results are best with clear, well-articulated speech regardless of language. Accents, dialects, and non-standard speech patterns are generally handled well, but heavily distorted audio, whispers, or shouting may produce less accurate lip sync. For multilingual content creators, this flexibility means you can generate avatar videos in English, Spanish, Mandarin, Arabic, or any other language without model-specific limitations.

LongCat Single Avatar (Audio Only) generates a default AI avatar without requiring any reference image, making it faster and simpler for generic spokesperson content. In contrast, models like LongCat Single Avatar (Image + Audio) or HeyGen Digital Twin Avatar V4 let you upload a photo to create a personalized avatar that matches a specific face or brand identity. The audio-only approach is ideal when you need quick turnaround, don't have suitable photos, or prefer anonymity. Image-based models are better when brand consistency, recognizable faces, or personalized spokesperson content is required. Both approaches deliver high-quality lip sync, so your choice depends on whether speed or customization is your priority.

Currently, JAI Portal's interface is designed for individual job submissions through the web dashboard. While there's no native batch upload UI for LongCat Single Avatar, you can queue multiple jobs sequentially by submitting them one after another. Each job processes independently, so you can prepare several audio files and prompts, then submit them in succession. For developers and teams needing programmatic access, JAI Portal offers API endpoints for many models—check the API documentation or contact support to confirm availability for LongCat Single Avatar. API access enables automation, integration with content management systems, and large-scale video production workflows, making it suitable for agencies and enterprises producing high volumes of avatar content.

⚖️ How LongCat Single Avatar (Audio Only) Compares

LongCat Single Avatar (Audio Only) stands out on JAI Portal for its simplicity and speed—it's the fastest way to create realistic talking avatar videos when you don't have a reference image. Unlike LongCat Single Avatar (Image + Audio), which requires uploading a photo to generate a personalized avatar, this audio-only version instantly produces a generic but highly lifelike spokesperson from voice alone. This makes it ideal for rapid prototyping, anonymous voiceovers, or scenarios where brand identity isn't tied to a specific face. For users who need custom avatars that match a real person or brand spokesperson, HeyGen Digital Twin Avatar V4 offers superior personalization but requires more setup time and reference materials. If you're working with multiple speakers or need group conversation videos, LongCat Multi Avatar supports multi-character scenes, though at higher complexity and credit cost. For pure text-to-avatar workflows without any audio input, Kling AI Avatar v2 Standard and Kling AI Avatar v2 Pro generate avatars from text prompts alone, trading audio-driven realism for text-based convenience. Choose LongCat Single Avatar (Audio Only) when you need quick, professional talking head videos from existing voice recordings, podcasts, or voiceover scripts—no photos, no actors, no delays. Compare models side-by-side on JAI Portal or start with a free trial at signup to find the right avatar solution for your workflow.