Gen-4.5 — the video generation model released by Runway

What is Gen-4.5?

Gen-4.5 is a video generation model developed by Runway. It sets new industry standards in motion quality, visual realism, and prompt adherence. Gen-4.5 can produce cinematic, highly realistic visuals while offering unlimited creative freedom and precise control. The model supports a wide range of aesthetic styles—from photorealism and cinematic looks to stylized animation—while maintaining strong visual consistency. Gen-4.5 introduces major breakthroughs in pre-training data efficiency and post-training techniques, delivering optimized performance and efficient deployment, pushing the frontier of video generation technology.

Key Features of Gen-4.5

High-quality video generation:
Gen-4.5 can generate videos with cinematic visual effects, demonstrating excellent visual realism and detailed rendering. It supports generation across simple scenes and complex multi-element settings, with precise depiction of object motion, physical effects, and subtle emotional expression.

Precise prompt following:
Gen-4.5 exhibits exceptionally high adherence to user prompts. It accurately interprets textual descriptions and generates video content aligned with them—covering object movements, scene details, character emotions, and more.

Diverse style control:
Gen-4.5 supports a wide spectrum of aesthetic styles, including photorealistic visuals, stylized animation, cinematic looks, and everyday scenes. Users can select different styles as needed while maintaining consistent visual language.

Multiple generation modes:
Gen-4.5 provides multiple creation modes such as Text-to-Video, Image-to-Video, keyframe-based generation, and Video-to-Video, offering creators a versatile toolset.

High performance and efficiency:
Gen-4.5 delivers high-quality outputs while maintaining speeds and efficiency comparable to its predecessor, Gen-4.

Technical Principles of Gen-4.5

Pre-training and post-training breakthroughs:
Gen-4.5 achieves major advancements in pre-training data efficiency and post-training techniques. By optimizing data processing and model training, it strengthens its ability to understand complex scenes and dynamic actions. The pre-training stage uses large-scale video data to learn general visual and motion features, while the post-training stage further enhances generation quality and task adaptability.

Video diffusion model:
Gen-4.5 is built on Video Diffusion Model technology, generating high-quality video by gradually denoising latent representations. This ensures strong frame-to-frame consistency and excellent detail fidelity.

High-performance GPU architecture:
Gen-4.5 is fully developed on NVIDIA’s high-performance GPU architectures, including Hopper and Blackwell. These GPUs provide powerful computational throughput, enabling efficient training and fast inference for real-time high-quality video generation.

Accurate motion and physics simulation:
Gen-4.5 can simulate realistic physical effects such as weight, momentum, and collisions. This allows generated videos to exhibit natural and believable motion and interactions.

Project Link

Official website: https://runwayml.com/research/introducing-runway-gen-4.5

Application Scenarios of Gen-4.5

Film production:
The model can rapidly generate high-quality visuals to support creative concepting, VFX production, and animation workflows.

Advertising:
It enables the creation of personalized, stylized video ads tailored to brand needs, helping capture audience attention quickly.

Game development:
Gen-4.5 can generate cutscenes, effects, and virtual characters, enhancing the visual experience and interactivity of games.

Education:
The model can generate educational videos—such as scientific experiments or historical reconstructions—to help learners better understand content.

Retail and e-commerce:
It can produce product showcase videos illustrating appearance, functionality, and usage scenarios, improving user experience.