GGUF quantizations of
Lightricks' LTX-2.5, converted for efficient execution in tools like ComfyUI. Example video is rendered using
Q4_K_M quantize variant.
LTX-2.5 is an open-world model with open weights, built for local execution and fine-tuning. It natively generates synchronized, high-fidelity video and audio in a single pass from text, image, and video inputs.
Key Features of LTX-2.5:
-
Synchronized Video and Audio: A dual-stream DiT with a 4096-wide video path, a 2048-wide audio path, and cross-modal attention joining them. No separate audio stage required.
-
Native Multishot Generation: Generates connected scenes in a single pass: multiple shots that hold character identity, environment, lighting, voice, and visual style across cuts (whereas previous versions produced a single continuous shot).
-
Diffusion Fidelity Rendering: Dynamically allocates compute by scene complexity and budget, rendering flawless detail where it matters and remaining efficient everywhere else.
-
Custom Gemma 4 12B Text Encoder: Holds complex prompts together (multiple characters, camera moves, lighting, actions) instead of dropping details across a longer sequence.
The original bf16 transformer weighs in at 39 GB. These GGUF quantizations bring it down to a manageable 11-23 GB for consumer hardware.
Below is a reference guide for the approximate VRAM required to load the 22 Billion parameter LTX-2.5-Distilled model at various GGUF quantization levels. Note: The sizes below refer specifically to the raw model weights loaded into memory. Generating video or high-resolution images will require an additional 4-8 GB of VRAM for the execution context, VAE, and text encoders depending on your ComfyUI configuration.
-
Q4_K_M: Best balance for typical consumer hardware (like a 16GB RTX 4080). Minor quality loss but runs very fast.
-
Q5_K_M: The sweet spot if you have a 24GB card (RTX 3090 / 4090). Noticeably better coherence than Q4 without hitting memory limits.
-
Q6_K: Very close to uncompressed BF16. Excellent choice if you have a powerful setup or Mac Studio.
-
Q8_0: Visually indistinguishable from the Master file, but requires significant memory.
-
Under $10M annual revenue: Commercial and production use at no cost under the LTX-2.x Community License.
-
Over $10M annual revenue: Requires a Paid Commercial Use Agreement with Lightricks.
Please refer to the
original Lightricks/LTX-2.5 repository for full, binding license terms and to accept the gated model agreement.
