How to Use Runway’s New Gen-4.5 Text-to-Video Model

Start by Accessing Runway’s Gen-4.5 Workspace: Runway’s Gen-4.5 model is available directly inside the Runway dashboard. Log in, choose “Text-to-Video,” and select the Gen-4.5 model from the drop-down. The new interface auto-loads enhanced controls for motion, style, and scene structure for smoother creativity.

Write a Detailed Prompt for Best Motion Quality: Gen-4.5 responds strongly to descriptive prompts covering setting, subject, camera movement, lighting, and mood. Add specifics like “slow tracking shot” or “high-contrast cinematic lighting.” The more precise the instructions, the more realistic and coherent the generated motion becomes across multi-second sequences.

Use the New Motion Brush for Fine Movement Control: The Motion Brush tool lets you paint motion onto specific areas of your frame. This gives precise control over how characters move, how clothes sway, or how environmental elements like water or hair react. It’s ideal for refining realism and fixing unnatural visual artifacts.

Apply Camera Controls for Dynamic Cinematic Shots: Gen-4.5’s enhanced camera system lets you define pans, dollies, zooms, and even handheld motion. You can simulate professional filmmaking styles and create dynamic, Hollywood-style shots. Adjust intensity and direction to maintain narrative coherence across longer video generations.

Use Style Presets to Match Artistic Direction: Runway now includes style presets like anime, hyper-realism, claymation, noir, watercolor, and futuristic sci-fi. Applying a preset ensures consistent aesthetics across the full clip. You can layer your own visual references or upload still images to guide color tone, texture, and mood.

Refine Outputs Using Frame Interpolation Tools: Gen-4.5 includes smoother frame interpolation, ideal for stabilizing motion or extending clips without losing quality. Use interpolation to enhance realism, remove jitter, and create slow-motion shots. This also helps maintain temporal consistency, especially for complex scenes with multiple characters or fast movement.

Export and Upscale for Final Delivery: After generating your video, use Runway’s built-in upscaling to enhance the resolution to 4K. You can also export in multiple aspect ratios for TikTok, YouTube, or cinematic formats. Save your project files to revisit and iterate later using the same prompt and style settings.

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