Kling AI expands Kling 4.0 video API capabilities
Kling 4.0 API supports single-run video generation up to 30 seconds, 720p and 1080p, plus 21:9 and adaptive aspect ratios. It adds up to 10 keyframes, voice references for Omni video, and higher asset limits, including 26,000-character English prompts.
Source: Kling AI API updates, checked Oct 28, 2026. Summarized from the provider’s announcement.