Nano Banana 2, officially known as Gemini 3.1 Flash Image, is Google's latest image generation model that combines fast processing with high visual quality. It generates images from 512px up to 4K resolution with support for multiple aspect ratios. The model features improved lighting and textures, sharper detail, enhanced character consistency (up to five characters), and better object fidelity (up to 14 elements). It excels with complex, nuanced prompts and maintains consistent storytelling across multiple generated images. All images include Google's SynthID watermark for AI origin identification.