New: Use KIE models from your coding agent →
runway / extend-ai-video
Commercial usePart of the Runway API family — compare all Runway models →

Step into the future of content creation with the Runway API, powered by Runway AI's groundbreaking Gen-4 architecture. Available exclusively through Kie.ai, this toolkit transforms ideas into stunning videos using the Runway Gen 4 Turbo API. Whether you're generating from text or converting images to dynamic footage, Runway AI image to video capabilities deliver professional results instantly.

Model Type:
Input

The taskId must be a valid taskId returned from the video generation interface. Note: Video generated after 1080P cannot be extended.

Describe the text prompt for extending the video content.

Video resolution.

Output
video placeholder

Enter a task ID to get the video version of your video.

README

Complete guide to using runway/extend-ai-video

Runway API: Revolutionize Video Creation with Gen-4 Turbo on Kie.ai

Discover the Runway API on Kie.ai, featuring Runway Gen 4 Turbo for seamless AI text-to-video and image-to-video generation. Boost your projects — no subscriptions needed.

What is Runway API?

The Runway API is a powerful interface to Runway AI's advanced video generation models, accessible via Kie.ai for developers and creators alike.

Next-Gen Video Synthesis:

Runway API leverages Runway Gen 4 Turbo to create high-fidelity videos from text prompts or images, ensuring temporal coherence and cinematic quality.

Seamless Integration Tool:

Designed for easy embedding into apps and workflows, the Runway API generates videos from a text prompt or an image in a single request, without complex software.

Accessible AI Innovation:

Through Kie.ai, users get instant Runway API keys with credit-based pricing, making Runway AI's tools available without barriers for experimenting with Runway AI image to video features.

Key Features of Runway API

Gen-4 Turbo Acceleration:

The Runway Gen 4 Turbo API now generates 5-8 second videos within a minute, a 5x speed boost over previous iterations, perfect for rapid prototyping.

Extend AI Video:

The Runway API allows users to extend existing AI-generated videos to create longer sequences while maintaining visual consistency and motion coherence.

Credit-Efficient Usage:

Kie.ai's credit system for Runway API lets you pay only for what you use, with no subscriptions, optimizing costs for Runway Gen 4 Turbo API projects.

Why Choose Us?

High-Quality Videos with Runway API

Kie.ai uses the power of Runway API to generate high-quality, professional videos. Whether converting images or text to video, you can expect exceptional clarity and detail in every project.

Fast Runway Video Generation with Kie.ai

With Kie.ai, enjoy rapid video generation powered by the Runway API. We ensure quick turnaround times so you can meet even the tightest deadlines without sacrificing quality.

Affordable Runway API Pricing

Access powerful video creation tools through Kie.ai at competitive prices. Our flexible pricing plans for the Runway API make advanced video generation affordable for businesses and creators alike.

How to Use Runway API on Kie.ai

Getting started with Runway API is straightforward with Kie.ai's user-friendly process.

  • 1. Sign Up for Your Kie.ai Account:

    Create an account on Kie.ai to access the Runway API and its features, including the Runway Gen 4 Turbo API.

  • 2. Create Your Runway API Key:

    Log in, go to the Key Management section, and generate your Runway API key instantly—no approvals needed.

  • 3. Integrate and Experiment:

    Use the key in your projects, referring to Kie.ai's Runway API documentation for integration guides and a playground to test prompts.

  • 4. Generate and Refine:

    Input text, images, or videos via the Runway API, adjust prompts for optimal results, and download your creations.
4.9/ 5
37,462 ratings
Tap a star to rate

User Feedback

See what our users have to say about our product

The video quality generated by the Runway API through Kie.ai is exceptional. With the Runway Gen 4 API, my projects have never looked better. It’s a game-changer for content creators!

John Smith

Product Manager

Thanks to the Runway AI API, we can quickly produce stunning videos for our marketing campaigns. The Runway API key integration was seamless, and the process is incredibly fast.

Sarah Johnson

Designer

The pricing for the Runway API on Kie.ai is highly affordable. With access to the Runway API, I get professional results at a fraction of the cost, making it perfect for my studio’s needs.

Mike Davis

Technical Director

Frequently Asked Questions

Here are some common questions and answers

Q

How do I get a Runway API Key?

A

You can instantly obtain your Runway API Key by creating an account on Kie.ai. Once logged in, you can generate your key from the dashboard — no subscriptions or approval processes required.

Q

How does Runway API pricing work?

A

Our Runway API pricing follows a transparent, credit-based model — no subscriptions, no minimums. You purchase credits (e.g. 1,000 for $5, 275,000 for $1,250 with discounts) and only pay for actual usage, giving you full control over your budget.

Q

Where can I find Runway API documentation?

A

You can access the full Runway API documentation at Kie.ai, including input formats, response handling, and best practices. A built-in playground is also available to test prompts without writing code.

Q

How can I improve the quality of generated videos?

A

Kie.ai offers instant API key generation, flexible credit-based billing, high-concurrency infrastructure, and 24/7 support — making it the fastest and most reliable way to integrate Runway Gen-4 Turbo into your own tools or workflows.