Kling 4.0 Flash Text to Video API
Kling 4.0 Flash Text to Video generates short MP4 clips from text prompts, first-frame images, or reference assets, prioritizing fast, cost-efficient output within the Kling 4.0 family.
Kling 4.0 Flash Text to Video is a video generation model from Kling AI, introduced in small-scale trial access starting September 28, 2026. It produces video from text prompts alone, and also accepts a first-frame image, reference images, elements, and reference videos. Prompts can be up to 26,000 characters, enough to describe an entire scene at once, and the model accepts up to 10 reference images and up to 7 elements.
Output is MP4 with 8-bit SDR color depth, limited to 720p resolution and clips of 3 to 20 seconds. Supported aspect ratios are auto, 16:9, 9:16, 1:1, and 21:9. The model is designed for especially fast generation within the Kling 4.0 family and emphasizes cost efficiency, making it suited to short video production for social media, e-commerce promotional clips built from product photos, and storyboard or previsualization drafts.
Some controls are reserved for the full Kling 4.0 model: only a single first-frame image is supported for image-to-video, while multi-keyframe control, 1080p resolution, and clips longer than 20 seconds require Kling 4.0. Kling 4.0 Flash is available in four model formats—text to video, image to video, reference to video, and video editing—and on third-party platforms including each::labs and Kie.ai.
Updated:
MODEL ID
kling-4.0-flash/text-to-video- Input
- text
- Output
- video
Highlights
- Fast generation within the Kling 4.0 family
- Cost-efficient video output
- Prompts up to 26,000 characters
- Up to 10 reference images and 7 elements
- 720p MP4 clips of 3 to 20 seconds
- Five aspect ratios including 21:9
Providers
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API reference
Model-specific protocol details are not published. Check the API reference for integration requirements.
API reference →Frequently asked questions
What is Kling 4.0 Flash Text to Video?
Kling 4.0 Flash Text to Video is a video generation model from Kling AI, introduced in small-scale trial access starting September 28, 2026. It produces video from text prompts alone, and also accepts a first-frame image, reference images, elements, and reference videos. Prompts can be up to 26,000 characters, enough to describe an entire scene at once, and the model accepts up to 10 reference images and up to 7 elements. Output is MP4 with 8-bit SDR color depth, limited to 720p resolution and clips of 3 to 20 seconds. Supported aspect ratios are auto, 16:9, 9:16, 1:1, and 21:9. The model is designed for especially fast generation within the Kling 4.0 family and emphasizes cost efficiency, making it suited to short video production for social media, e-commerce promotional clips built from product photos, and storyboard or previsualization drafts. Some controls are reserved for the full Kling 4.0 model: only a single first-frame image is supported for image-to-video, while multi-keyframe control, 1080p resolution, and clips longer than 20 seconds require Kling 4.0. Kling 4.0 Flash is available in four model formats—text to video, image to video, reference to video, and video editing—and on third-party platforms including each::labs and Kie.ai.
How is usage billed?
Your bill depends on the provider you use, its prices and your usage. Longer inputs or other conditions may have different prices.
What inputs does Kling 4.0 Flash Text to Video accept?
It accepts text prompts, a first-frame image, reference images, elements, and reference videos. It supports up to 10 reference images and up to 7 elements.
How long can prompts and clips be?
Prompts can be up to 26,000 characters. Clip length is limited to 3 to 20 seconds.
What resolution and format does it output?
Output is MP4 with 8-bit SDR color depth at up to 720p resolution. Supported aspect ratios are auto, 16:9, 9:16, 1:1, and 21:9.
What tasks is it best suited for?
It is aimed at short video production for social media, e-commerce promotional clips from product photos, and storyboard or previsualization drafts, with an emphasis on fast generation and cost efficiency.
How does it differ from Kling 4.0?
Kling 4.0 Flash supports only a single first-frame image for image-to-video and is limited to 720p and 20-second clips. Multi-keyframe control, 1080p resolution, and clips over 20 seconds require Kling 4.0.
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