Is Kling AI free to use?

Yes, Kling AI offers a free tier where users receive 66 daily credits, equating to about six free videos per day [1.7].

Who developed Kling AI?

Kling AI was developed by Kuaishou, a leading Chinese technology company known for its short-video platform.

Can Kling AI add audio to videos?

Yes, starting with Kling 3.0, the model features native multi-lingual audio generation, including lip-synced voices.

What is the maximum resolution for Kling AI videos?

With the latest updates, Kling AI can generate videos in up to 4K Ultra HD resolution at 60 frames per second on the Ultra tier.

Kuaishou vs Runway AI, Inc.

Kling AI vs Runway Gen-4.5

Kling AI (High-quality AI video generation model by Kuaishou.) compared to Runway Gen-4.5 (A new frontier for video and world simulation.).

Kling AI and Runway Gen-4.5 target adjacent jobs but take different approaches. This page compares them side by side on output paradigm, access, capabilities, and positioning — based on vendor-stated claims as of 2026-04-21 / 2026-04-21.

At a Glance

Kuaishou

Kling AI

High-quality AI video generation model by Kuaishou.

Utilizes a self-developed 3D Variational Autoencoder (VAE) for synchronous spatiotemporal compression [1.1].
Natively generates multi-lingual, lip-synced audio from text without requiring separate audio files.
Features a unique 'Element' system allowing users to upload up to 4 reference elements to maintain character and object consistency.

See Kling AI details →

Runway AI, Inc.

Runway Gen-4.5

A new frontier for video and world simulation.

Built on GWM-1, an advanced General World Model architecture that intrinsically understands and simulates real-world physics.
Offers infinite character and object consistency across multiple angles and scenes using only a single reference image.
Provides an integrated node-based workflow system that lets users chain multiple AI models and modalities directly within the web interface.

See Runway Gen-4.5 details →

How They Compare

Dimension	Kling AI	Runway Gen-4.5
Modality	text-to-video, image-to-video, text-to-image	text-to-video, image-to-video, video-to-video, text-to-audio
Release status	ga (2024-06-10)	ga (2025-12-11)
Capabilities	Text-to-Video Generation · Image-to-Video Generation · Multi-lingual Lip Sync · Cinematic Camera Movements	Character Consistency · Physics Simulation · Cinematic Camera Control · Video to Video
Max Resolution	4K Ultra HD [1.8]	4K (via built-in upscale)
Frame Rate	30fps to 60fps	—
Free Tier	66 daily credits	—
Architecture	Diffusion-based Transformer (DiT) / Multi-modal Visual Language (MVL)	GWM-1 (General World Model)
Max Duration	—	Up to 34 seconds (via extend tool)

Which Should You Choose?

Pick Kling AI if you need: Utilizes a self-developed 3D Variational Autoencoder (VAE) for synchronous spatiotemporal compression [1.1]..
Pick Runway Gen-4.5 if you need: Built on GWM-1, an advanced General World Model architecture that intrinsically understands and simulates real-world physics..
Both come from different vendors — consider your existing stack.