How many aspect ratios does each Sume image model list? Oct 2026

Nano Banana 2.1 lists the most aspect ratio values on Sume, 15 including auto, and Ideogram V3 and 4.5 follow with 15 as well but with a different set. Imagen 4 Fast and Ultra list only five. The count is a rough guide; what matters is which ratios you need, so the table lists the shape of each row.

The counts come from the repository catalog source on 2026-10-08. Google's Oct 6 changelog also names 1:4, 4:1, 1:8 and 8:1 as supported across 1K, 2K and 4K for Nano Banana 2.1, which matches what Sume lists.

Count by row

How to use the counts

• A 4:5 Instagram post: skip Grok and both Imagen rows; every other row lists 4:5 except Soul.
• An ultra-wide banner: Nano Banana 2.1 for 8:1, FLUX.2 or Qwen for 21:9.
• A phone-tall story: Grok lists 9:20 and 9:19.5; other rows stop at 9:16 or 9:21 where listed.
• A GPT Image row accepts image_size pixels, which take priority over aspect_ratio.

Two cases worth testing

First, phone-tall art. Grok Image lists 9:19.5 and 9:20, and it is the cheapest of the long-list rows at about $0.025 per image, but it does not list 4:5, so a feed post and a tall story need different rows. Second, banners. A request for 8:1 on Nano Banana 2.1 returns a strip eight times as wide as it is tall; no other row lists it, so for a different row you generate at 21:9 or 2:1 and crop.

If you serve many ratios from one prompt, pick the row that lists all of them rather than switching models per ratio; the look stays consistent. In practice that is Nano Banana 2.1 or an Ideogram row, depending on whether you need banner extremes or 10:16 shapes.

What a longer list does not tell you

A long list is not a quality signal. Ratios are only the shapes a row accepts. It tells you nothing about price, either: the 15-value Ideogram rows range from about $0.0375 to $0.275 per image depending on quality.

Sume does not resize or pad to a ratio the model does not list, so a missing value is a real limit. Read supported_parameters.aspect_ratio from the catalog when you need the live answer.