Nano banana 2 API — Extreme Ratios + Search Grounding
Nano banana 2 is the community name for Google's Gemini 3.1 Flash Image. Nano banana 2 adds extreme aspect ratios (1:8, 8:1) and Google search grounding to the Nano banana family — call it through reApi's OpenAI-compatible endpoint.
Per-call billing — the cheapest way to call Nano banana 2.
Same API endpoint. The model parameter selects the variant.
Free text · required · detailed prompts produce better results
Provide a prompt or at least one reference image / video / frame.
14 ratios incl. extreme 1:4 / 4:1 / 1:8 / 8:1
0.5K thumbnail · 1K default · 2K / 4K hero
1–4 images per request
Up to 14 · public HTTPS URLs only
Useful for recent events, named entities, real places
Sent without google_search:true returns 400
What you can build
Real workflows powered by this model.
Banner ads at 8:1 without crop pain
Nano banana 2 is the only Nano banana variant that natively renders extreme ratios. Set size to 8:1 for a long horizontal sponsorship banner, 1:8 for a tall mobile-first poster, 1:4 / 4:1 for in-feed promo strips. The output is composed for the ratio at generation time — no cropping, no fill, no awkward dead space. Run a campaign at half a dozen formats from the same Nano banana 2 prompt and the visual story stays coherent across every placement.
Render an 8:1 banner
Search-grounded brand visuals
Turn on google_search and Nano banana 2 reads textual context from the web before drafting the image. Add google_image_search and the model also pulls visual references. Useful for recent events, named entities, sports teams, regional landmarks — anywhere a generic prompt would produce a generic image. Nano banana 2 keeps the request async, the same endpoint, the same credit lifecycle as every other reApi model.
Cheap previews at 0.5K, ship at 4K
Nano banana 2 is the only Nano banana variant that exposes a 0.5K tier — useful for thumbnail previews, prompt iteration, and low-cost A/B grids. Once the concept lands, re-run at 4K for the production asset. Same prompt template, same image_urls, just bump the resolution field. Nano banana 2 keeps the composition stable across resolutions so the 0.5K preview accurately predicts the 4K final.
Pricing
Credit-based — 1 credit = $0.001 USD. Pay only for completed generations.
| Mode | Category | Unit | Price |
|---|---|---|---|
| Default | |||
| 0.5K / 1K | 1 image | $0.041 41 credits | |
| 2K | 1 image | $0.061 61 credits | |
| 4K | 1 image | $0.091 91 credits | |
| Official Google | |||
| 0.5K / 1K | 1 image | $0.062 62 credits | |
| 2K | 1 image | $0.093 93 credits | |
| 4K | 1 image | $0.139 139 credits | |
Why reAPI
Ratios no other Nano banana variant ships
Nano banana 2 unlocks 1:4, 4:1, 1:8, and 8:1 in addition to the ten standard ratios. That covers tall posters, banner ads, long-strip social formats, and side-rail web placements without any cropping or fill step. If your campaign brief lists multiple non-square placements, Nano banana 2 is the variant to default to.
Optional search grounding, on-demand
Two boolean freAPI— google_search and google_image_search — opt Nano banana 2 into web grounding. Off by default, so the cost stays predictable; flip them on for prompts that reference recent events, real people, or specific places. The image_search flag requires text search to be on; the gateway enforces the pairing before charging credits.
Async-first, drop-in compatible
Submit a Nano banana 2 task, get a task_id back, poll until done. 4K and search-grounded calls take longer than vanilla 1K; the async pattern means your handler never blocks. Failed and moderated requests are not charged. Nano banana 2 plugs into the same task plumbing you use for every reApi model — the lifecycle is identical.
Integrate Nano banana 2 in three steps
- step 01
Create an API key
Sign up at reApi and grab a key. Free signup credits cover dozens of Nano banana 2 generations — enough to test extreme ratios and search grounding before topping up.
Open - step 02
Submit a generation
POST to /api/v1/images/generations with model: gemini-3.1-flash-image-preview, a prompt, and optional size / resolution / n / google_search. Nano banana 2 returns a task_id immediately so the request never blocks your handler.
Open - step 03
Poll the result
GET /api/v1/tasks/:id until status is completed. The Nano banana 2 response carries image URLs on our CDN, stable for 24 hours; mirror them to your own storage if you need them longer.
Open
Frequently asked questions
Common questions about this model.
POST /api/v1/images/generations
Authorization: Bearer $REAPI_API_KEY
Content-Type: application/json
{
"prompt": "..."
}Ready to ship?
Try it in the playground or grab an API key to integrate now.