Shopify's recommended 2048 x 2048 product image with gpt-image-2.5
Shopify.dev recommends 2048 x 2048 px for product images. That is a valid custom image_size on Sume's gpt-image-2.5: 2048 is a multiple of 16 and 4,194,304 px.
Shopify's product media page lists 2048 x 2048 pixels as the recommended image size. On Sume that is a valid custom image_size for openai/gpt-image-2.5: 2048 is a multiple of 16, the 1:1 ratio is under 3:1, and 4,194,304 pixels sits inside the 655,360 to 8,294,400 range.
Does 2048 x 2048 pass Sume's custom size rules?
The Image API docs give four rules for a custom size on ChatGPT Image 2.5. Here is 2048 x 2048 against each.
| Rule | Limit | 2048 x 2048 |
|---|---|---|
| Edge multiple | Multiple of 16 | 2048 = 128 x 16, passes |
| Longest edge | 3840 max | 2048, passes |
| Aspect ratio | 3:1 at most | 1:1, passes |
| Pixels | 655,360 to 8,294,400 | 4,194,304, passes |
What does the request look like?
Send image_size as 2048x2048. Omitted quality defaults to high on this model, and background takes auto, transparent or opaque.
curl -X POST https://api.sume.com/v1/images \
-H "Authorization: Bearer $SUME_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "openai/gpt-image-2.5",
"prompt": "Leather wallet on a light grey backdrop, soft shadow, studio product photo",
"image_size": "2048x2048",
"background": "opaque",
"output_format": "jpeg"
}'Is 2048 x 2048 a requirement?
No. Shopify's page read on 2026-09-30 calls it recommended, and states a maximum of 4472 x 4472 px and 20 MB. A smaller square works if you do not need to zoom.
What should I check after generation?
The response returns a Sume-hosted URL, and the docs state cost as the USD amount billed. Open the file to confirm the size and the product details; a generated image can change small features of a product, so compare it to the real item before you publish.
Sources
Related posts
More in Use cases
- Black Friday homepage hero image for Shopify: one set, many sizes
Shopify's BFCM checklist says to put seasonal motifs in the hero image and extend it across channels. Render one reference to each channel's ratio with Sume.
- Black Friday teaser video for a Shopify store: a batch plan
Shopify's BFCM checklist says to send warm-up emails with hints and teasers. Make one teaser per product from a sheet with a Sume Format bulk run.
- Shopify image max 4472 x 4472 px: what Sume's image API outputs
Shopify.dev caps product images at 20 MB and 4472 x 4472 px. gpt-image-2.5 on Sume stops at a 3840 edge and 8,294,400 pixels, so it sits under the pixel cap.
- Shopify product video at 3840x2160: which Sume model lists 4K?
Shopify.dev caps product video at 3840x2160 (UHD/4K). Sume lists a 4K tier on gemini-omni-flash-1.1 for 3 to 10 seconds in 16:9 or 9:16. Request and checks.
Written by Sume