Runway Gen-4.5 (by Runway)

Overview

High-fidelity cinematic motion with strong prompt adherence. Replaces the older Gen-4 Turbo / Aleph / Act-Two pages in this docs set.

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Quick facts

• Modes: Text → Video · Image → Video

• Default clip length: 5s (up to 10s)

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What it's great for

• Cinematic output.

• Consistent character and scene quality.

• Prompt-faithful motion.

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Parameters

Control	Type	Default	Notes
Prompt	Text	—	Required
Duration	Dropdown	5s	Up to 10s

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Modes

Mode	Estimated time	Required inputs	Typical use
Text → Video	~180s	Prompt	Cinematic generation
Image → Video	~180s	Image, Prompt	Animate a still

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