Nano Banana 2.1 vs Pro from 512 to 4K: price per image on Sume

Nano Banana 2.1 costs $0.075 at 512, $0.10 at 1K, $0.15 at 2K and $0.20 at 4K on Sume. Nano Banana Pro is $0.1875 at every tier up to 2K and $0.375 at 4K.

Both are listed with resolution values 512, 1K, 2K and 4K, up to ten reference images and n up to 4 in the Image API.

Tier table

What the shape of the table tells you

Pro's flat price from 512 to 2K means there is no reason to request a small tier on Pro; ask for 2K and pay the same $0.1875. On 2.1 the price rises with each step, so the 512 tier is the cheap draft lane at $0.075.

At 4K, 2.1 is $0.20 and Pro is $0.375, a 1.88x gap.

Request

Swap the model and the resolution; nothing else changes.

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-2.1",
    "prompt": "Ceramic mug on a linen cloth, top-down",
    "resolution": "2K",
    "aspect_ratio": "1:1"
  }'

Choosing

• Drafts: Nano Banana 2.1 at 512, the cheapest Nano Banana row at $0.075.
• Finals at 2K or below: the price gap is the model, not the tier, so test both on your prompts.
• 4K print or hero work: compare the two 4K prices in the table and render once.
• Read GET /v1/images/models/{model_id}/endpoints for the live pricing line before a large run: prices are catalog data and can change.