gemini-3.1-flash-image
The Nano banana api provides developers with sub-second visual reasoning and a 1M token context window. Optimized for high-throughput OCR, native video analysis, and spatial detection, this API delivers pro-tier vision at a fraction of the cost.

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$ 0.067

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Core Features of the Nano Banana API

Technical standout features that define the Nano banana api performance.

Nano Video Reasoning

Analyze up to 60 minutes of video natively without the overhead of manual frame extraction.

"resolution": "8K ultra high definition", "style": "hyper - realistic food illustration with editorial infographic overlays", "lighting": "soft directional key light, subtle rimlight' "scene_description": "A vertical stack of cake slices floating above a plate against soft pink gradient background", "motion_elements": ["floating fruits", "floating macarons", "crumbs suspended in air"], "text_design": { "ingredient_name_color": "metallic gold", "indicator_lines": "long, thin, smooth golden lines with rounded corners"

Prompt
Nano Video Reasoning
After

Nano Context Caching

Store large image sets in KV cache to reduce input costs by up to 90% on frequent requests.

A beautiful anime scene in the style of Studio Ghibli. A young girl in a simple summer dress sits alone on a weathered wooden bench at a rural bus stop in the Japanese countryside. It's late afternoon, and the sky is a soft orange. The bus stop is surrounded by lush, overgrown greenery and towering, vibrant green camphor trees. A single cicada is visible on the signpost. The atmosphere is peaceful, slightly nostalgic, and filled with the quiet hum of summer. Beautifully detailed hand-drawn background, soft, warm color palette.

Prompt
Nano Context Caching
After

Nano Spatial Detection

Native ability to return normalized bounding box coordinates for objects detected in any image.

An ultra-photorealistic shot, capturing a lazy ginger cat sleeping peacefully on a stack of old books next to a window. Soft morning sunlight streams in, illuminating dust motes dancing in the air and highlighting the fine texture of the cat's fur and the worn paper of the books. A half-empty ceramic mug of tea sits nearby. The focus is sharp on the cat, with the rest of the cozy room gently blurred in the background. Shot with a Canon EOS R5, 50mm f/1.8 lens, natural lighting, serene and quiet mood.

Prompt
Nano Spatial Detection
After

Nano Sub-Second Inference

Optimized for TTFT under 200ms, enabling real-time vision agents and responsive live-camera loops.

an epic sci-fi movie poster, a lone astronaut standing on a vast desert planet, a gigantic ringed planet rising in the sky, dramatic sunset lighting, blowing sand, cinematic composition, IMAX scale, photorealistic, space for title at the top, film poster design, ultra detailed

Prompt
Nano Sub-Second Inference
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How to Get a gemini-3.1-flash-image API Key

Getting a gemini-3.1-flash-image API key takes four steps and a few minutes. Create a free GPTProto account, add credits, generate your key, and make your first call — at $0.0402 it's a cheaper gemini-3.1-flash-image API key than going direct, and one key works across every model on the platform. Full gemini-3.1-flash-image Documentation is in the docs.

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Your balance can be used across all models on the platform, including gemini-3.1-flash-image, giving you the flexibility to experiment and scale as needed.

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Generate your API key

In your dashboard, create an API key — you'll need it to authenticate when making requests to gemini-3.1-flash-image.

Make your first API call

Make your first API call

Use your API key with our sample code to send a request to gemini-3.1-flash-image via GPT Proto and see instant AI-powered results.

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Nano Banana API Frequently Asked Questions

Find technical answers regarding the Nano banana api, its vision capabilities, and integration through GPTProto.

How fast is the Nano banana api for vision?

The Nano banana api is engineered for speed, delivering a Time-To-First-Token (TTFT) under 200ms for single-image prompts. This sub-second inference makes it an ideal choice for live-camera agentic loops and real-time visual feedback systems. Unlike heavier models that struggle with latency, this API ensures that visual reasoning happens almost instantaneously, allowing for seamless integration into interactive consumer applications.

Can the Nano banana api analyze long videos?

Yes. The Nano banana api supports native video context, allowing it to process up to 60 minutes of video in a single prompt. It treats video frames as temporal tokens, which eliminates the need for developers to manually extract frames. This makes the Nano banana api highly effective for creating cinematic posters, summary infographics, or performing security feed analysis over long durations without losing context.

What is Nano Context Caching?

Nano Context Caching allows you to store frequently used image sets or massive documentation in the model's KV cache. By using this feature via the Nano banana api, developers can achieve up to a 90% cost reduction on repeat calls. It is particularly useful for Visual RAG applications where the same technical diagrams or blueprints are queried repeatedly, ensuring high performance while maintaining a very low operational budget.

Does this API support structured data extraction?

The Nano banana api excels at high-density OCR and structured data tasks. It offers native support for JSON mode via the response_format parameter. In technical tests, the Nano banana api demonstrates over 98% character accuracy when converting high-resolution PDF scans or handwritten notes into Markdown tables or JSON objects. It is a powerful tool for digitizing millions of invoices or insurance forms at scale.

Is my data private when using the Nano banana api?

Privacy is a core pillar of our platform. Under our enterprise agreement with Google, no data sent through the Nano banana api on GPTProto is used to train foundation models. Your images, videos, and text prompts remain isolated and secure. This ensures the Nano banana api is compliant with strict enterprise requirements for sensitive document processing, medical scanning analysis, and proprietary technical research.

What image resolutions can the Nano banana api generate?

The Nano banana api is highly flexible, supporting resolutions from 512px up to 4K. It also offers specialized aspect ratios like 1:8 and 8:1, which are unique to the 3.1 Flash series. Whether you need a small 0.5K thumbnail or a high-fidelity 4K marketing asset, the Nano banana api adjusts its processing to balance quality and speed. All generated images include a SynthID watermark for responsible AI usage tracking.