Introduction
Gen-4 Aleph is Runway's video editing and generation model, available on invideo. It's designed as a post-generation editing layer - take any video you've already created or uploaded, and refine it through text prompts. Add or remove objects, change camera angles, relight scenes, or modify characters without reshooting or regenerating from scratch.
This article covers how to access Gen-4 Aleph, what it does best, and prompt best practices.
How to get started
From the homepage, click Generative models → See all → select Gen-4 Aleph
Upload a reference image or video to edit, or start from a text prompt alone
Enter your prompt describing what you want to generate or change
Preview, refine with follow-up prompts, and download
Spec information
Input types | Text, image, video |
Aspect ratios | 16:9, 9:16, 4:3, 1:1, 3:4, 21:9 |
Prompt best practices
Gen-4 Aleph works best when you describe the edit precisely - what exists, what should change, and what should stay the same.
Example: Keep the product and table surface. Change the background to a dark moody kitchen at night. Add soft warm rim lighting from the right.
💡 Tips for better results | Why it helps |
Describe what stays, not just what changes | Gen-4 Aleph preserves everything you don't mention - being explicit avoids unintended edits |
Specify lighting direction and quality | The model relights scenes accurately when given explicit light source and quality descriptions |
Use camera language for angle changes | "Change to a medium close-up" or "shift to bird's eye view" gives the model a precise target |
Upload a reference video for motion transfer | Describing motion in text is less reliable than showing it - use a reference clip wherever possible |