KeyoAPI
Nano Banana Pro API — Google's Top Image Tier on KeyoAPI
Nano Banana Pro is Google's top image generation tier served on KeyoAPI's OpenAI-compatible /v1/images/generations endpoint — same Bearer key as chat, $0.0274 per image, built for high-resolution commercial visuals and fine-grained editing.
Overview
Nano Banana Pro is the top tier of Google's Nano Banana image family, served on KeyoAPI through the OpenAI-compatible /v1/images/generations endpoint. If you already call chat, Whisper, or OCR with a KeyoAPI key, image generation is one more model string — no Google Cloud project, no second credential.
Pricing is per generated image: $0.0274 on pro, against nano-banana-2 at $0.0205 (base lane) and nano-banana-2.1 at $0.0123 (newer release). Pro earns its premium when fidelity dominates — higher resolution output and finer editing control for commercial visuals, detailed image work and art direction. All three tiers run on the same key, so escalating a prompt from 2.1 to pro is a model-string change.
Call it with POST /v1/images/generations, model=nano-banana-pro, and a prompt. size is optional (1024x1024 by default). Responses come back in the OpenAI images shape synchronously — no task polling — so existing clients and SDKs work after pointing base_url at https://www.keyoapi.xyz/v1. Confirm live rates on the full pricing list before volume work.
Quick start
Base URL: https://www.keyoapi.xyz/v1
Endpoint: POST /v1/images/generations
Model: model=nano-banana-pro · prompt required · size optional (e.g. 1024x1024)
curl https://www.keyoapi.xyz/v1/images/generations \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model":"nano-banana-pro","prompt":"a mug of coffee on a desk, studio light","size":"1024x1024"}'Auth uses the same Bearer API key as chat. Full notes: Keyo docs.
FAQ
How do I call the Nano Banana Pro API?
Use your KeyoAPI Bearer key and POST to /v1/images/generations with model=nano-banana-pro and a prompt. The endpoint is OpenAI-compatible, so existing image clients work with a base URL change.
Nano Banana Pro vs 2 vs 2.1 — which one?
nano-banana-pro is the top tier at $0.0274 per image with higher resolution and finer editing control; nano-banana-2 is the base lane at $0.0205; nano-banana-2.1 is the newer release at $0.0123. All three run on the same key — see the nano-banana-2.1 model page, the nano-banana-2 model page and the full pricing list.