Imagen 4 API shut down in the Gemini API: what Sume's catalog lists

Google's Gemini API docs state that Imagen is shut down there and tell developers to migrate to Nano Banana. Sume's image catalog code still lists google/imagen-4-fast and google/imagen-4-ultra alongside google/nano-banana-2 and google/nano-banana-pro, so what you can call on Sume is decided by Sume's catalog, not by Google's page.

Google's statement is from its Imagen page; Sume's from the Image API docs and catalog code, read 2026-09-29. Confirm with GET /v1/images/models, because a catalog can change.

What does Google say?

Its Imagen page reads: "Imagen is Google's legacy image generation model. It is now shut down and no longer available in the Gemini API." It says to migrate to Nano Banana, using gemini-2.5-flash-image or newer Nano Banana models in place of Imagen model names.

What are the Imagen rows on Sume?

Neither lists a 4:5 ratio, and their aspect ratios are the five below. Check GET /v1/images/models for whether a model accepts input_references.

What should new work use?

If you need reference images or a 4:5 ratio, use a model that lists them; both Nano Banana ids list 4:5 and accept up to 10 input_references. Nano Banana Pro vs Nano Banana 2 explains the choice.

curl -X POST https://api.sume.com/v1/images \
  -H "Authorization: Bearer $SUME_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "google/nano-banana-2", "prompt": "A lighthouse in a storm, oil painting", "aspect_ratio": "16:9"}'

Will my old Imagen model id keep working?

Sume's docs make no promise about future availability. Check the catalog before relying on any id.