Kling aspect ratio options: what it accepts and what it rejects

Kling 2.0 Standard accepts 3 aspect ratios through the API:

• 16:9
• 9:16
• 1:1

Not accepted: 4:3, 3:4. A payload that works on a model with the wider set fails here with 400 INVALID_PARAM — worth knowing if you switch models by changing one string.

It does not affect price

Aspect ratio is free. Kling 2.0 Standard costs 35 credits ($0.35–$0.48) at any of the ratios above.

resolution is fixed at 1080p here, so there is no resolution lever either.

Default

Omit aspect_ratio and you get 16:9.

-d '{"model":"kling-2.0-standard","prompt":"...","aspect_ratio":"1:1"}'

With a start frame

The API does not reconcile aspect_ratio with the image you pass in image_inputs. Supplying a 16:9 still while asking for a portrait ratio gives the model contradictory instructions. Match them — see Kling image to video.

Models covered on this page

• Kling 2.0