Kling 2.6: How to Generate AI Video with Native Audio

Kling 2.6 generates sound and video simultaneously.

Kuaishou released Kling 2.6 on December 3, 2025, introducing native sound generation to AI video. Instead of creating video first and adding sound later, Kling 2.6 produces synchronized dialogue, effects, and ambient sound in a single pass.

This changes production workflows fundamentally. No separate recording. No manual synchronization. No lip-sync adjustment.

What Kling 2.6 Does Differently

Traditional AI video workflow:

1. Generate video
2. Export
3. Record or source sound separately
4. Import to editing software
5. Manually sync sound to video
6. Adjust timing and lip movements
7. Export final result

Kling 2.6 workflow:

1. Generate video with synchronized sound
2. Export final result

The efficiency difference is significant. Sound synchronization—historically one of the most time-consuming post-production tasks—becomes automatic.

Kling 2.6 Sound Capabilities

Voice Generation

Kling 2.6 generates human voice with control over:

• Speaking styles: Normal dialogue, narration, whispers, shouts
• Singing: Musical vocal performances
• Rapping: Rhythmic vocal content
• Emotional tone: Happy, sad, excited, calm, angry
• Pacing and rhythm: Speed and delivery timing
• Volume dynamics: Quiet to loud transitions

The model synchronizes lip movements to generated speech automatically. Characters speak with accurate mouth shapes and timing.

Sound Effects

Kling 2.6 generates contextual effects:

• Impact sounds (glass breaking, doors closing, collisions)
• Movement sounds (footsteps, fabric rustling, object handling)
• Mechanical sounds (engines, machinery, electronics)
• Nature sounds (water, wind, fire, animals)

Effects align with visual events. A glass falling produces impact sound when it visually contacts a surface—not before, not after.

Ambient Sound

Kling 2.6 produces environmental soundscapes:

• Location-appropriate ambiance (city traffic, forest, ocean, indoor spaces)
• Weather sounds (rain, wind, thunder)
• Crowd and background activity
• Room tone and acoustic environment

Ambient sound matches the visual setting automatically. An outdoor scene generates outdoor ambiance; an indoor scene generates appropriate interior acoustics.

Combined Layers

Kling 2.6 layers sound types together:

• Dialogue over ambient background
• Effects integrated with speech
• Music underlying scene sound
• Multiple simultaneous elements

The model balances levels automatically, though results vary with complexity.

Kling 2.6 Technical Specs

Two Input Modes

Text-to-Video with Sound

Describe the scene and sound together:

Prompt: "A woman in a coffee shop explains her new product. Soft background chatter, espresso machine sounds occasionally. She speaks enthusiastically but at moderate volume. Warm afternoon lighting."

Kling 2.6 generates:

• Video of woman speaking in coffee shop
• Her dialogue with synchronized lip movements
• Background coffee shop ambiance
• Occasional espresso machine sounds

Image-to-Video with Sound

Provide a reference image, describe the sound:

Input: Image of a man at a desk Prompt: "He explains a technical concept, professional tone, slight office ambient noise. Speaking clearly at moderate pace."

Kling 2.6:

• Animates the reference image
• Generates professional-sounding speech
• Synchronizes lip movements to dialogue
• Adds subtle office background sound

Synchronization Quality

Kling 2.6's synchronization uses semantic alignment—the model understands what's happening visually and produces corresponding sound.

What works well:

• Single-speaker dialogue scenes
• Clear cause-effect relationships (footstep + step, impact + collision)
• Consistent ambient environments
• Emotional voice matching visual performance

What challenges the model:

• Multiple simultaneous speakers
• Complex overlapping sound sources
• Rapid scene changes requiring transitions
• Highly specific musical requirements

For single-subject content—a spokesperson, product demo, character monologue—synchronization quality is production-viable. Complex multi-source scenes require more careful prompting.

How to Use Kling 2.6 Effectively

Specify Requirements Explicitly

Kling 2.6 generates what you describe. Vague prompts produce generic results.

Less effective: "A man talks about the product."

More effective: "A man speaks enthusiastically about the product, clear pronunciation, professional but warm tone, moderate pace. Subtle indoor ambient sound, no music."

Control Emotional Tone

Voice emotion follows prompt guidance:

• "speaks excitedly" → energetic delivery
• "whispers urgently" → quiet, intense tone
• "explains calmly" → measured, relaxed delivery
• "shouts angrily" → loud, aggressive performance

Match voice emotion to visual performance for coherent results.

Describe Sound Relationships

Explicit cause-effect descriptions improve synchronization:

• "Her heels click on the marble floor as she walks"
• "The glass shatters on impact with the table"
• "Wind rustles the leaves overhead"

Kling 2.6 handles these relationships automatically, but explicit description increases accuracy.

Keep Complexity Manageable

Start simple, add complexity gradually:

1. Simple: Single speaker, minimal background
2. Medium: Single speaker, environmental ambiance
3. Complex: Speaker + specific effects + ambiance

Complex layers increase the chance of synchronization issues. Build up rather than specifying everything at once.

Best Use Cases for Kling 2.6

Kling 2.6 delivers strongest results for sound-dependent content:

Spokesperson and Explainer Videos

• Product explanations with synchronized speech
• Tutorial narration with visual demonstration
• Presenter-style content for social media
• Talking head videos for marketing

Dialogue Scenes

• Single-character monologues
• Simple two-character conversations (with caveats)
• Interview-style Q&A formats
• Testimonial content

Sound-Critical Content

• ASMR-style close-up content
• Product demonstrations emphasizing sound (electronics, mechanical items)
• Nature and environment content where sound is essential
• Music-driven shorts

Social Media Content

• TikTok and Reels with native sound
• Stories with voice narration
• Quick promotional clips with dialogue
• Content where separate production isn't practical

Kling 2.6 Limitations

Multiple simultaneous speakers: Quality degrades significantly with more than one speaking character. Dialogue scenes work best with alternating speakers.

Specific music generation: Background music is possible but not precisely controllable. Complex musical requirements need external tools.

Complex mixing: Kling 2.6 handles basic layering but can't match professional engineering for complex soundscapes.

Perfect lip-sync every time: While generally accurate, some generations produce noticeable sync issues. Expect to regenerate occasionally.

Kling 2.6 vs Separate Workflows

Kling 2.6 wins on speed and simplicity. Separate workflows win on control and quality ceiling. Choose based on project requirements.

Key Takeaways

• Kling 2.6 generates synchronized sound alongside video—dialogue, effects, and ambient in one pass.
• Voice capabilities: Speaking, singing, rapping with emotional control and automatic lip-sync.
• Sound effects: Contextual sounds aligned with visual events.
• Two modes: Text-to-video and image-to-video, both with integrated sound.
• Specify requirements explicitly—vague prompts produce generic results.
• Best for: Spokesperson videos, dialogue scenes, sound-critical content, social media.
• Limitations: Multiple speakers, specific music, complex mixing, occasional sync issues.
• Trade-off: Speed and simplicity vs. control and quality ceiling of separate workflows.