Kling AI announced on November 4 that Kling 4.0 Flash is open to all users on the website and via API, and is also reachable through MCP, CLI and AI plugins, including Photoshop, Premiere Pro and After Effects. The official API changelog says the Flash API generates 3 to 20 second videos at 720P, supports text-to-video, image-to-video and Omni reference-to-video, accepts up to 15 inputs per task and bills by total duration.
Key Takeaways
- ✓Flash had been in early access for Ultra yearly subscribers since September 28; it is now open to all users and the API.
- ✓The API paths are kling-4.0-flash under /text-to-video, /image-to-video and /omni-video; image-to-video takes a single first-frame image.
- ✓Prompts can be up to 26,000 English characters, with up to 10 reference images and 5 reference videos, plus 21:9 and adaptive aspect ratios.
- ✓Billing is by the total duration of input and output video; unit prices are on the official pricing page and were not stated in the announcement.
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Background and industry pain points
Video generation keeps improving, but the high-quality tiers are expensive and slow, which makes frequent drafting costly. Kling 4.0 shipped at the end of September with a lighter Flash variant aimed at speed and value, but Flash stayed in early access for Ultra yearly subscribers. After the full Kling 4.0 API opened on October 28, Kling announced on November 4 that Flash is open to all users and the API.
Architecture highlights and mechanisms
Flash targets frequent creation and tops out at 720P and 20 seconds, one step below the full 4.0 model's 30 seconds and 1080P. The official API supports text-to-video, image-to-video and Omni reference-to-video; Omni reference mixes images, videos and elements for reference-based generation or video editing, with up to 15 inputs per task. Duration and aspect ratio can be set by parameters or prompts, including 21:9 and adaptive ratios.
Benchmarks and measured comparisons
Kling did not publish benchmark scores for Flash, comparisons with other video models, or concrete generation speeds. What is confirmed is the spec: 3 to 20 seconds, 720P, up to 10 reference images and 5 reference videos, and prompts up to 26,000 English characters.
Developer adoption and getting started
Developers can call the three kling-4.0-flash API paths directly, draft quickly with Flash and then hand finished concepts to full 4.0 for higher-resolution output. Agent workflows can use MCP or CLI, and editing teams can generate inside Photoshop, Premiere Pro and After Effects through the Adobe plugins. Check the pricing page before shipping, since input video duration is billed too.
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