Model Selection
Chat Video Pro has two different model selection systems, each serving a specific purpose. Understanding the difference helps you choose the right workflow for your needs.
Two Model Selectors
1. Top-Right Model Selector (Chat Header)
Location: Top-right corner of the chat header, next to the sidebar toggle
What it controls:
LLM Model - The language model used for text generation and chat responses (GPT-4o, GPT-5, etc.)
Default Image Model - The image model used for natural language requests like "generate me an image of..."
When to use:
Text conversations - Choosing which AI handles your chat
Quick image generation - When you say "create an image of a sunset" in chat
NLP image requests - Natural language image generation without opening Generate Media mode
Characteristics:
✅ Fast path - Quick and simple
✅ Natural language - Just describe what you want
❌ Limited control - No aspect ratio, resolution, or advanced settings
❌ No video generation - Cannot generate videos from this selector
Example workflow:
Type: "Generate me an image of a coffee shop"
AI uses your default image model (set in top-right selector)
Image appears in chat
No settings to configure - uses defaults
2. Generate Media Model Selector (Composer)
Location: Appears in the composer when you enable the Generate Media toggle
What it controls:
Video Models - Sora, Veo, Kling, Hailuo, WAN, etc.
Image Models - Flux, GPT Image, Nano Banana, etc.
Video-to-Video Models - SAM 3, Kling VFX, LTX Reshoot, Upscale
When to use:
Video generation - The only way to generate videos
Custom image settings - When you need specific aspect ratio, resolution, or advanced options
Video editing - When you want to edit existing videos
Full control - When you need to customize all parameters
Characteristics:
✅ Full control - Aspect ratio, resolution, duration, audio, etc.
✅ Video generation - Only way to create videos
✅ Advanced settings - Model-specific parameters
✅ Adaptive - Model list changes based on what you attach
Example workflow:
Enable Generate Media toggle
Select video model (e.g., Veo 3.1)
Set aspect ratio (16:9), duration (8s), enable audio
Enter detailed prompt
Generate with full control
How Generate Media Model List Adapts
The Generate Media model selector intelligently adapts based on what you attach to the composer. This ensures you only see relevant models for your current workflow.
No Attachments (Text-to-Media)
Available Models:
Text-to-Video models - Sora 2, Veo 3.1, Kling, Hailuo, WAN
Text-to-Image models - Flux 2 Max, GPT Image 1.5, Nano Banana Pro, etc.
Use case: Creating content from scratch with text prompts
One Image Attached
Available Models:
Image-to-Video models - Animate your image into motion
Image-to-Image models - Edit or modify the image
Text-to-Video models - Still available (image becomes reference)
Automatic behavior:
Model selector may auto-switch to image-to-video mode
You can manually switch between image and video modes
Image editing models appear when in image mode
Use case:
Animate a still image into a video
Edit an existing image
Use image as reference for video generation
Two Images Attached
Available Models:
Transition models - Kling O1 Transition, Kling 2.5 Transition, Veo 3.1 First/Last
Text-to-Video models - Still available (images become references)
Automatic behavior:
Transition Mode activates automatically
Transition-specific models appear in the selector
Duration and aspect ratio may be locked based on source images
Use case:
Create smooth transitions between two keyframes
Morph from one scene to another
Generate transition footage for edits
One Video Attached
Available Models:
Video-to-Video models - SAM 3, Kling VFX, LTX Reshoot
Upscale models - Topaz, Flash VSR 2, Bria
Automatic behavior:
Text-to-video and image models disappear
Only video editing models are shown
Model selector may auto-select SAM 3 (default for video editing)
Use case:
Remove background from video (SAM 3)
Add visual effects (Kling VFX)
Regenerate with different style (LTX Reshoot)
Upscale video resolution
Model Selection Workflow
Quick Image Generation
Best for: Fast, simple image generation
Set default image model in top-right selector
Type in chat: "Generate me an image of a mountain landscape"
Image appears - No settings to configure
Done - Quick and simple
Full Control Image Generation (Generate Media)
Best for: When you need specific settings
Enable Generate Media toggle
Select image model from dropdown
Set aspect ratio (16:9, 9:16, 1:1, etc.)
Set resolution (if available for model)
Enter prompt with details
Generate with full control
Video Generation (Generate Media Only)
Best for: Creating videos (only way to do it)
Enable Generate Media toggle
Select video model (Sora, Veo, Kling, etc.)
Set all parameters:
Aspect ratio
Resolution
Duration
Audio (if supported)
Enter detailed prompt
Generate video
Video Editing (Generate Media with Video Attached)
Best for: Modifying existing videos
Attach video using Import Clip button or drag & drop
Enable Generate Media (if not already enabled)
Model selector shows only video-to-video models
Select editing mode:
SAM 3 for background removal
Kling VFX for effects
LTX Reshoot for regeneration
Upscale for resolution increase
Configure settings for selected model
Generate
Understanding Model Modes
Text-to-Video Mode
No images attached
Text prompt only
All video models available
Full parameter control
Image-to-Video Mode
1 image attached
Describe motion in prompt
Image-to-video models available
Image becomes the starting frame
Transition Mode
2 images attached
Automatic activation
Transition models only
Creates smooth morph between frames
Video-to-Video Mode
1+ videos attached
Editing existing footage
Video editing models only
No text-to-video models shown
Tips for Choosing the Right Selector
Use Top-Right Selector When:
✅ You want quick image generation
✅ You don't need custom settings
✅ You're having a conversation and want images
✅ You want the fastest workflow
Use Generate Media Selector When:
✅ You need to generate videos
✅ You want custom aspect ratio/resolution
✅ You need advanced model settings
✅ You're editing existing videos
✅ You want full control over generation
Model Selection Persistence
Top-Right Selector
LLM model - Persists across conversations
Default image model - Persists across conversations
Generate Media Selector
Last selected model - Remembers your choice
Mode (image/video) - Remembers last used mode
Settings - Per-model settings are saved
Adaptive - Changes based on attachments
Troubleshooting
"I can't generate videos"
Solution: Videos can only be generated using the Generate Media model selector. Enable the Generate Media toggle first.
"Wrong models showing"
Check:
What's attached to the composer? (images, videos, nothing)
Is Generate Media enabled?
Are you in the right mode? (image vs video)
"Settings don't match the model"
Solution: Some settings are model-specific. The interface automatically shows/hides options based on the selected model.
"Model selector is empty"
Solutions:
Check your Fal.ai account has credits
Verify API keys are configured
Some models may have temporary availability issues
Check you're in the correct mode (image vs video)
Next: Learn about Conversation Starters to get started quickly with pre-configured assistants.
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