Kling 4.0 30 seconds: Sume lists kling-3 at 4 to 15

Kling's Kling 4.0 page announces native generation from 3 to 30 seconds. Sume's catalog lists kling-3, not Kling 4.0, and kling-3 accepts 4 to 15 seconds. If you need a 30-second single request on Sume today, the ids documented for it are seedance-2.5 (4 to 30 seconds) and wan-3.0 (2 to 30 seconds).

Kling facts are from its blog post (full model "coming in October 2026", early access from September 28); Sume facts are from Video Router and the API catalog, read 2026-09-30.

What does Kling announce for duration?

The post says Kling 4.0 "supports native video generation from 3 to 30 seconds" and suggests breaking the 30 seconds into story beats. It also says feature availability may vary during the initial rollout, so treat 30 seconds as an announcement until the full model ships.

What duration does Sume list for kling-3?

The catalog row for kling-3 has duration_seconds: { min: 4, max: 15 } with resolutions 720p and 1080p. That is the Kling model Sume lists; nothing in the catalog or docs lists a Kling 4.0 id.

How do I check the limit before I submit?

The docs say limits are per model and to read capabilities from GET /v1/video-router/models rather than assuming one envelope. Check the listed duration range there before sending a request, instead of assuming a Kling-style 30 seconds carries over.

What if I need longer than a model allows?

Make several clips and join them with Timeline 1.0. The post 1-minute AI video generator walks through two 30-second clips and a join. For the Kling side of the story, see Kling 4.0 API availability.