Question 1

What resolution does 4K mode produce?

Accepted Answer

4K mode outputs 3840×2160 for 16:9, 2160×3840 for 9:16, and 2160×2160 for 1:1 — roughly 4x the pixel count of 1080p.

Question 2

How does 4K differ from Pro mode?

Accepted Answer

Pro mode tops out at 1920×1080. 4K mode uses the same motion and physics model but renders at a much higher resolution, which takes longer and costs more per second.

Question 3

Can I still control duration and audio?

Accepted Answer

Yes. `duration` supports 3–15 seconds and `generate_audio` toggles audio generation just like the standard and pro variants.

Question 4

What input images work best?

Accepted Answer

Sharp, high-resolution images with clear subjects and balanced lighting. Low-resolution or noisy inputs will not magically become 4K — the source image quality sets the ceiling.