Creating with Gen-4.5: A Complete Guide to Next-Level AI Video Generation

As AI video production continues to evolve, Runway’s Gen-4.5 stands out as a state-of-the-art model that redefines motion quality, prompt adherence, and visual fidelity. Whether you are a filmmaker, marketer, or digital artist, Gen-4.5 brings unprecedented physical accuracy, multi-step action handling, and rich cinematic depth to your fingertips.

Drawing from official Runway documentation and best practices, this guide walks you through everything you need to know to create professional-grade video content with Gen-4.5.

Step 1 — Accessing Gen-4.5

Finding and launching Gen-4.5 within the Runway platform is streamlined for fast creative workflows. You can jump in using two primary methods:

• Apps View: Navigate to the Apps View and type Gen-4.5 into the search menu at the top of the screen.
• Tool Mode: Open Tool Mode, select Video from the model selector, and choose Gen-4.5 from the available roster.

Once selected, you can immediately choose between Text-to-Video and Image-to-Video generation modes.

Step 2 — Drafting the Prompt

Prompting for Gen-4.5 requires clarity and precision. Because the model excels at interpreting detailed directions, your text prompts act as a direct blueprint for your final shot.

• Text-to-Video Prompts: Describe both the visual elements and the motion of the scene in direct language. You can specify intricate camera choreography, precise scene compositions, event timing, and atmospheric changes all within a single prompt.
• Image-to-Video Prompts: Begin by dragging and dropping a high-resolution, artifact-free image into the prompt window. Your text prompt should then pivot to focusing primarily on describing the motion, transformation, or environmental reactions of the scene.

Pro Tip: Gen-4.5 is built to understand positive phrasing. Describe what should happen in the video rather than what to avoid, as negative prompts are generally unsupported and can yield unpredictable results.

Step 3 — Configuring Your Shot Settings

Before hitting generate, optimize your output parameters to match your project requirements:

| Parameter | Options & Best Practices |
| :— | :— |
| Aspect Ratio | Defaults to match your input image, or can be adjusted manually to crop or fit target cinematic/social dimensions. |
| Duration | Select anywhere between 2 to 10 seconds. Opt for longer durations if your prompt features complex, multi-step sequential actions. |
| FPS (Frames Per Second) | Choose between 24 or 25fps via the advanced settings for standard film or broadcast frame rates. |
| Export Formats | For Max, Unlimited, and Enterprise plans, you can export outputs as ProRes or a PNG sequence for maximum post-production flexibility (adds 5 credits per second). |

Step 4 — Generating, Iterating, and Refining

Once your parameters are locked in, click Generate to process your video. After the generation is complete, a robust set of workspace controls appears on the right and left sides of the preview:

• Manage & Save: Use the controls beneath the right side of the output to favorite, upscale, or download your final asset.
• Iterate and Chain: Click the Use button on the lower-left side beneath the generation to feed your result back into the pipeline.
• Troubleshoot & Adjust: If the motion or framing isn’t quite right, make minor prompt adjustments to refine your results iteratively.

Ready to Create? Jump into Runway today, experiment with detailed camera terms, and watch how Gen-4.5 transforms complex creative visions into seamless motion.