Kie.ai offers API access to Google's Nano Banana (Gemini 2.5 Flash Image) and Nano Banana Pro (Gemini 3 Pro Image) models for AI image generation and editing at per-image credit pricing.
About
Kie.ai is an API platform that resells access to a wide catalog of AI models, and its Nano Banana API page provides developer access to Google's Gemini image models under the "Nano Banana" name. The standard Nano Banana API is built on Gemini 2.5 Flash Image and is positioned for fast, low-cost image generation and editing, while Nano Banana Pro API uses Gemini 3 Pro Image for higher-fidelity output, precise text rendering, and more complex instructions.
Developers obtain an API key from Kie.ai and call the models through a unified REST interface, with an on-page Playground for testing prompts and parameters before writing code. The same platform also hosts video, audio, and chat model APIs, so a single account can serve multiple AI workloads. The service is aimed at teams building image-heavy applications — batch generation, editing tools, preview pipelines — without managing the underlying model infrastructure directly.
Key Features
Pricing & Fees
- Pricing: The standard Nano Banana API costs 4 credits per image, listed at approximately $0.02 per image; higher-tier account top-ups carry a 10% credit bonus, bringing the effective rate to roughly $0.018 per image. Nano Banana Pro pricing is listed separately on the Kie.ai pricing page.
- NSFW filter option: An `nsfw_checker` parameter is configurable and defaults to true in the Playground; Kie.ai notes the filter is not guaranteed to catch everything.
- File limits: Uploaded images are limited to 10 MB per file (up to 10 files) on the standard editing endpoint and 30 MB per file (up to 8 files) on the Pro endpoint, in JPEG, PNG, or WEBP formats.
Who It's For
The service is designed for developers and product teams building applications that need AI image generation or editing at scale, such as batch content production, instant preview tools, and design automation. Standard-tier users with high-volume, latency-sensitive workloads can use the Gemini 2.5 Flash Image model, while professional creators and enterprises needing studio-grade output, accurate in-image text, and 4K resolution can use Nano Banana Pro. It also suits teams that want one provider for image, video, audio, and chat model APIs under a single billing account.
FAQ
What is the Nano Banana API on Kie.ai?It is a paid API service that provides access to Google's Nano Banana image models — standard (Gemini 2.5 Flash Image) and Pro (Gemini 3 Pro Image) — for AI image generation and editing.
How much does the Nano Banana API cost?The standard Nano Banana API costs 4 credits per image, about $0.02, dropping to roughly $0.018 per image with the 10% bonus on higher-tier credit top-ups. Pro-tier prices are listed on the Kie.ai pricing page.
What input and output options are supported?Prompts up to 20,000 characters, multiple aspect ratios, and PNG or JPEG output are supported; editing accepts up to 10 uploaded images (10 MB each), and the Pro endpoint accepts up to 8 reference images (30 MB each) with 1K, 2K, or 4K resolution.
What is the difference between Nano Banana and Nano Banana Pro?The standard model prioritizes speed and low cost for high-volume tasks, while Pro uses Gemini 3 Pro Image for 4K resolution, accurate text rendering, a 64K context window, and more complex multi-step editing.
Is the content filter reliable?Kie.ai offers an optional NSFW checker that defaults to true in the Playground, but the company states there is no guarantee everything will be filtered, so users may need their own safeguards.
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