AI phone case art: tall ratios 9:16, 9:19.5 and 9:21 on Sume

For phone case art ask for a tall ratio. On Sume, 9:16 is listed by most models, 9:19.5 and 9:20 by Grok Imagine ($0.025), and 9:21 by Qwen Image, Flux 2 and Recraft V4. Pick the model by price and ratio (read 2026-10-03), then crop to your print partner's exact template. This post uses only the ratios in the Sume catalog, because a case template varies by phone.

Tall ratios by model

These are the catalog values on 2026-10-03. GPT Image 2.5 lists 9:16 and, for custom pixels, allows any aspect up to 3:1 with edges that are multiples of 16.

Leave room for the camera

Most cases have a camera cutout, usually near the top corner. Ask for a design that works without the top-left tenth of the picture, or place a plain area there. You then cut the real hole in your own template; do not rely on the model to know where it goes.

A request

This asks Qwen Image for a tall abstract design at 9:21 and four variants, 4 x $0.025 = $0.10 in total.

curl -s https://api.sume.com/v1/images \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "qwen/qwen-image", "aspect_ratio": "9:21", "n": 4, "prompt": "Tall abstract design of layered sunset gradients and thin wave lines, flat colors, calm empty area in the upper left corner, no text, no logos"}' 

Keep words out of the render

OpenAI's image guide (read 2026-10-03) says its models can still struggle with precise text placement and clarity. For a case with a name or a quote, make the pattern first and place the type in design software where you control spelling and size.

What Sume does not do

Sume does not hold phone templates or send files to print vendors. If the model returns a ratio close to but not exactly your template, resize with Pillow or crop to the template.

• Check the final pixel size against the template.
• Keep the first render as the master and crop copies.
• A failed generation is not billed, according to the docs.