Nano Banana 2 Lite API: what Google shipped and what Sume lists

Nano Banana 2 Lite is Google's gemini-3.1-flash-lite-image model, released on 2026-06-30 in the Gemini API and Google AI Studio. Sume's image catalog does not currently list it: the Nano Banana models Sume lists are google/nano-banana-2 and google/nano-banana-pro, so a request naming Lite will not resolve there.

Google's side comes from its launch post and Gemini API docs; Sume's side from the Image API docs and the image catalog code. All read 2026-09-29.

What is Nano Banana 2 Lite?

Google describes it as a speed- and cost-focused Gemini image model for near-real-time, high-volume work, with prompt adherence, character consistency and legible in-image text. Google's launch post says text-to-image outputs arrive in 4 seconds, and recommends it as the replacement for gemini-2.5-flash-image.

It is one of four Nano Banana models in Google's docs, next to gemini-3.1-flash-image, gemini-3-pro-image and the legacy gemini-2.5-flash-image.

What does Google's documentation say about its limits?

Can I call Nano Banana 2 Lite through Sume?

Not as a listed model today. POST /v1/images accepts the ids in GET /v1/images/models, and a model that is not in that catalog is not accepted. The catalog is the source of truth, so check it instead of trusting a blog post, including this one:

curl "https://api.sume.com/v1/images/models" \
  -H "Authorization: Bearer $SUME_API_KEY"

Which Nano Banana models can I use on Sume now?

google/nano-banana-2 and google/nano-banana-pro both take a resolution tier from 512 to 4K, a native aspect_ratio, and up to 10 input_references. One 1K Nano Banana 2 image is estimated at $0.10 on Sume. Model-by-model detail is in Nano Banana Pro API on Sume.

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 ceramic mug on a linen cloth, soft window light",
    "resolution": "1K",
    "aspect_ratio": "1:1"
  }'

Will Sume add it?

The docs make no promise either way, so this post makes none. When a model reaches the catalog it shows up in GET /v1/images/models with its supported parameters and its pricing line.