Kling AI has initiated closed beta testing for its Kling 4.0 model, with an official launch scheduled for October. The upgraded model delivers enhanced stability in large-scale motion and complex camera movements, supports native generation of up to 30 seconds per output, and accepts up to 10 keyframe inputs. It also enables high-spec output in 4K and 1080p 10-bit HDR formats with improved continuous narrative capabilities. Alongside the flagship release, Kling AI introduced Kling 4.0 Flash, a cost-effective variant optimized for high-frequency creative scenarios that combines efficient generation speed with lower costs. This version is now available for trial use as the company prepares for the full public rollout next month.