Supported Video Models

Chat Video Pro supports multiple state-of-the-art AI video generation models, each optimized for different use cases.

Model Comparison

Model	Provider	Duration	Resolution	Audio	Best For
Sora 2	OpenAI	4-12s	720p-1080p	❌	Long clips, cinematic quality
Sora 2 Pro	OpenAI	4-12s	1080p-4K	❌	Highest quality, longer clips
Veo 3.1	Google	4-8s	720p-1080p	✅	Dialogue, speaking characters
Veo 3.1 Fast	Google	4-8s	720p-1080p	✅	Quick iterations with audio
Kling 2.6 Pro	Kuaishou	5-10s	720p	✅	Longer clips with audio
Kling 2.1 Pro	Kuaishou	5-10s	720p	❌	Complex camera movement
Kling O1	Kuaishou	5-10s	720p-1080p	❌	Best prompt understanding
Hailuo 2.3	Hailuo	4-8s	720p-1080p	❌	Action, sports, dynamic scenes
WAN 2.5	WAN	4-8s	1080p-4K	❌	High resolution output

Quick Selection Guide

Choose Sora 2 if:

• ✅ You need clips longer than 8 seconds (up to 12s)

• ✅ You want the highest cinematic quality

• ✅ You don't need audio generation

• ✅ Budget allows for premium model

Choose Veo 3.1 if:

• ✅ Your scene has dialogue or speaking characters

• ✅ You need synchronized audio and lip-sync

• ✅ You want 8-second clips with audio

• ✅ You need character consistency (with Reference mode)

Choose Kling 2.6 if:

• ✅ You need audio generation (5-10 seconds)

• ✅ You want longer clips than Veo (up to 10s)

• ✅ You need good quality with audio

Choose Kling 2.1 Pro if:

• ✅ You need complex camera movement (360°, FPV, orbit)

• ✅ You want cinematic camera work

• ✅ You don't need audio

Choose Kling O1 if:

• ✅ You have a complex or detailed prompt

• ✅ You want the best prompt understanding

• ✅ You need reference mode with 2-7 images

Choose Hailuo 2.3 if:

• ✅ Your scene has action, sports, or stunts

• ✅ You need dynamic, fast-paced movement

• ✅ You want smooth motion and fluid animation

Choose WAN 2.5 if:

• ✅ You need native 1080p or 4K output

• ✅ Resolution is more important than duration

• ✅ You want high-quality upscaling source

Models with Audio Generation

Veo 3.1 & Veo 3.1 Fast

Audio Capabilities:

• ✅ Native audio generation

• ✅ Excellent lip-sync

• ✅ Sound effects

• ✅ Music generation

Best For:

• Dialogue scenes

• Speaking characters

• Music videos

• Scenes requiring synchronized audio

Limitations:

• 8-second maximum duration

• Audio quality varies by prompt

Kling 2.6 Pro

Audio Capabilities:

• ✅ Native audio generation

• ✅ Good lip-sync

• ✅ Sound effects

Best For:

• Longer clips with audio (up to 10s)

• Scenes needing audio but not dialogue-critical

Limitations:

• Audio quality may be less precise than Veo

Models Without Audio

For models without audio generation:

• Add audio in post-production (Premiere Pro)

• Use music libraries

• Record voiceover separately

• Import existing audio tracks

Specialized Models

Transition Models

Kling O1 Transition

• Optimized for image-to-image transitions

• Requires exactly 2 images

• Creates smooth morphing between frames

Kling 2.5 Transition

• Alternative transition model

• Good for frame-to-frame transitions

Veo 3.1 First/Last

• Transition mode with audio support

• Can generate sound for transitions

Reference Mode Models

Veo 3.1 Reference

• Maintains character/product consistency

• Supports 1-3 reference images

• 8-second duration (locked)

• Audio generation supported

Kling O1 Reference

• Advanced reference mode

• Supports 2-7 reference images

• 5s or 10s duration options

• Uses @Image syntax in prompts

Model-Specific Tips

Sora 2 / Sora 2 Pro

Prompt Tips:

• Use cinematic language

• Describe camera movement clearly

• Mention style and mood

• Longer prompts work well

Best Practices:

• Great for establishing shots

• Excellent for B-roll

• Use for longer narrative sequences

Veo 3.1

Prompt Tips:

• Include dialogue in quotes: "Hello, welcome to..."

• Describe speaking character clearly

• Mention audio needs: "with background music"

• Reference mode for character consistency

Best Practices:

• Perfect for talking head videos

• Great for product demonstrations with voiceover

• Use for music video concepts

Kling Models

Prompt Tips:

• Emphasize camera movement: "360° orbit", "FPV drone shot"

• Describe complex motion clearly

• Use cinematic terminology

• O1 models understand detailed prompts

Best Practices:

• Kling 2.1 Pro for dynamic camera work

• Kling O1 for complex scenes

• Kling 2.6 for audio needs

Hailuo 2.3

Prompt Tips:

• Focus on action and movement

• Describe dynamic elements

• Emphasize motion and flow

• Great for sports and action scenes

Best Practices:

• Sports highlights

• Action sequences

• Dynamic B-roll

• Fast-paced content

Cost Considerations

Approximate costs per second of video (varies by model and resolution):

• Sora 2: ~$0.05-0.15/second

• Veo 3.1: ~$0.04-0.12/second

• Kling models: ~$0.03-0.10/second

• Hailuo 2.3: ~$0.02-0.08/second

• WAN 2.5: ~$0.04-0.12/second

Note: Check fal.ai/pricing for current rates.

Switching Models

You can easily switch models:

1. After generation: Click "Regenerate" and select different model

2. Before generation: Change model in the model selector

3. Compare results: Generate same prompt with different models

Troubleshooting

"Model not available"

• Check your Fal.ai account has sufficient credits

• Verify the model is supported in your region

• Some models may have temporary availability issues

"Audio not generating"

• Ensure you selected a model with audio support (Veo 3.1, Kling 2.6)

• Check "Audio" toggle is enabled

• Verify your prompt mentions audio needs

"Duration limit reached"

• Each model has maximum duration limits

• Use Sora 2 for longer clips (up to 12s)

• Consider splitting into multiple clips

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Next: Learn about Text-to-Video generation workflows.