Kling AI Video Length Limit: Maximum Duration by Version and Plan (2026)

Kling AI's video generation capabilities are defined by specific duration limits and feature constraints that vary by subscription plan. As of 2026, a single Kling AI generation is capped at 10 seconds, with the default being 5 seconds, and the Extend feature allows for incremental additions of 4 to 5 seconds per call, up to a maximum of 3 minutes in total duration. This system necessitates multiple sequential Extend calls to reach longer video lengths, and video quality often starts to decline after about 30 seconds due to compounded compression errors. The video length limits are consistent across all model versions, from kling-v1 to the latest kling-v3, which showcases enhanced features like native 4K resolution but does not extend the duration cap. Access to the Extend feature is restricted to paid plans, with free accounts limited to a single 10-second clip. While the Kling API documentation underscores these constraints, users handling large-scale or batch video projects often prefer using API access through platforms like Atlas Cloud, which offer per-second billing, providing more predictable costs and bypassing daily credit restrictions.