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Kling 4.0 Rolls Out with Open API

Kuaishou launched Kling 4.0 with Omni Reference upgrades, rolled it out fully alongside a lighter 4.0 Flash, then opened API access as third-party platforms rushed to integrate it.

2026-10-21 ~ 2026-10-23 · 2 episodes · 17 posts

Episode 1 · Kuaishou Launches Kling 4.0 with 30-Second Native Video and Global API (2026-10-21, 8 posts)

Kuaishou released Kling 4.0, its next-generation video generation model, on October 15 and rolled it out globally around October 21, alongside a lighter 4.0 Flash variant and a first-ever global API. The release marks another rapid step in AI video generation capability.

Confirmed

  • Generation: Up to 30 seconds of native single-shot generation, extendable to 2 minutes, supporting long takes and continuous narrative (@lmoroney); @xiaohu adds 4K resolution and dual-channel audio output
  • Product & API: Full rollout of Kling 4.0 and 4.0 Flash with a global-first API (@xiaohu)
  • Control & references: Up to 15 reference assets per generation (detailed by @xiaohu as 10 images, 5 videos, 7 subjects and voice references), plus tri-view, storyboard and depth-video modes; keyframe mode loads a start frame, up to 8 intermediate frames and an end frame (10 keyframes total), with keyframes defining location, composition and subject state while prompts govern transitions and camera movement (@azedai, @lmoroney)
  • Quality: Officials cite improved stability in complex motion, stronger cross-character and cross-scene reference consistency, and more precise cinematic control (@markk, @gorkem); reposted content highlights character consistency and lip-sync improvements
  • Platforms: Kling 4.0 launched on fal; Adobe announced upcoming Firefly integration (@lmoroney)

Unconfirmed

  • @VraserX claims outputs are nearly indistinguishable from real footage and that traditional filmmaking is being ended in real time — a personal judgment awaiting broader validation

Why it matters

  • 30-second native generation and 2-minute extension dramatically lengthen AI video narratives, and with 4K and dual-channel audio directly challenge traditional production pipelines
  • Multi-reference and keyframe controls push toward cinema-grade controllable generation
  • The global API debut and Adobe Firefly integration put the model in reach of both developers and mainstream creative-tool users

Episode 2 · Kuaishou's Kling AI Launches Kling 4.0 with Open API as Third-Party Platforms Roll It Out (2026-10-21, 9 posts)

Kling AI, owned by Kuaishou, officially launched Kling 4.0 between October 21–23 and simultaneously opened API applications. The headline upgrades are Omni Reference — up to 15 reference inputs per task — and 30-second single-shot generation. Multiple third-party platforms integrated the model, with creator tests showing strong character consistency, signaling the start of a broader third-party video-generation ecosystem.

Confirmed

  • Official launch: per @testingcatalog, Kling 4.0 supports up to 15 images, videos, subjects or sounds as references per task, up to 30 seconds per generation, with first/middle/last frame control.
  • API access: per @aziz4ai, the Kling 4.0 API is open for applications and can be embedded into products and workflows; previously the model was limited to the official App/Web.
  • Platform rollouts: Higgsfield (via @CurieuxExplorer) supports 30-second scenes and Omni Reference with native 4K "coming soon"; Magnific (via @aziz4ai) adds 30-second scenes, up to 10 keyframe guides and native audio; Buzzy (via @antharaai) emphasizes character consistency, 30-second generation, frame control and more cinematic camera moves.
  • Hands-on results: @testingcatalog's two rounds of tests showed a cyberpunk robot maintaining consistent appearance across wide shots, close-ups and screen cuts, and reusability in a new neon-street scene without redesign; @aziz4ai used the API to build a fantasy trailer.

Unconfirmed

  • Native 4K output is only announced as "coming soon" with no timeline; @aziz4ai's claim that quality is "near commercial grade" and "approaching 4K" is personal opinion.

Why it matters

  • Raising multimodal references to 15 per task, combined with 30-second generation and keyframe control, significantly shortens the path from assets to final footage.
  • Opening the API ends official-app exclusivity, letting third-party video apps integrate Kling and directly reshaping the competitive landscape of video generation.