SOpen
LTX-2.3
Lightricks
The open-source flagship. First open model to close the gap with proprietary leaders.
SClosed
Runway Gen-4.5
Runway
The creative director's tool. Industry benchmark for character consistency.
Pick LTX-2.3 if…
You want open-source audio-video, or studios needing IP control.
Pick Runway Gen-4.5 if…
You want brand campaigns, character-consistent series, or agency production.
Specifications
Maker
Lightricks
Runway
Source Type
Open Source
Closed Source
License
Apache 2.0 (<$10M rev)
Commercial (subscription)
Architecture
DiT (22B) + Rebuilt VAE
Proprietary DiT
Parameters
22B
Undisclosed
Max Resolution
4K
1080p (upscaled 4K)
Max Duration
20s
10s clips
FPS
Up to 50
24-30
Native Audio
Yes
Yes
ComfyUI Support
Yes
No
Fine-tunable
Yes
No
Min VRAM
32GB (full) / 12GB (distilled)
Cloud only
Cost / Second
$0.04
~$0.15 (credits)
Inputs
T2V, I2V, V2V, Audio-cond
T2V, I2V, References
On Floyo
Yes
No
Strengths & Trade-offs
LTX-2.3
Strengths
- +22B params
- +true 4K at 50fps
- +first open model with synced audio
- +rebuilt VAE
- +native portrait
Trade-offs
- -Full 4K needs 48GB
- -dialogue lip-sync inconsistent
- -in-scene text flaky
Best For
- →Local 4K production
- →open-source audio-video
- →studios needing IP control
Runway Gen-4.5
Strengths
- +Best character consistency (References)
- +Motion Brush
- +30-90s gen
- +30+ tools
- +Act-Two mocap
Trade-offs
- -10s clip limit
- -opaque credits
- -T2V inconsistent without guidance
Best For
- →Brand campaigns
- →character-consistent series
- →agency production
Run these models on Floyo
Browser-based ComfyUI. No setup, no GPU required.
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