Nano Banana 2 Lite's 10 aspect ratios: what to send for 4:5

Nano Banana 2 Lite accepts ten aspect ratios, including 4:5 for Instagram portrait and 21:9 for ultrawide, per Google's image-generation page. Lite itself is not in the Sume catalog, but Sume's Nano Banana Pro and Nano Banana 2 rows include 4:5.

Lite's ratios

The list below is from Google's page.

Check the count

Count: 1 + 5 + 4 = 10. Landscape and portrait are mirrored except 21:9, which has no portrait twin in the list.

What to send for Instagram on Sume

The Sume docs say 4:5 is Instagram portrait (1080x1350), not 4:3. On Nano Banana, a 1080x1350 size becomes aspect_ratio: "4:5" plus a job target_pixels; the native Banana output is about 928x1152 at 1K, and the exact 1080x1350 is a documented post-step. Imagen and Grok do not list 4:5, so a 4:5 request to them returns a catalog error.

{
  "model": "google/nano-banana-pro",
  "prompt": "a skincare bottle on a marble shelf, soft morning light",
  "aspect_ratio": "4:5"
}

Verify before you send

Each model accepts only the ratios in its catalog row, so read supported_parameters before you pin one. A value not listed returns 400 unsupported_parameter.