Nano Banana 2（Gemini 3.1 Flash Image）是 Google 又快又好的图像模型。本文用 Google 的官方示例和提示词介绍它的能力，并整理规格、价格以及与 Nano Banana Pro、Lite 的区别。
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Nano Banana 2 是 Google 为 Gemini 3.1 Flash Image 起的名字。Google 的描述是：它以“闪电般的速度”带来 Nano Banana Pro 的世界知识、画质和推理能力。本页所有图片都是 Google 随模型发布的官方示例，并附上 Google 使用的提示词（保留英文原文）。
Prompt: “High-quality flat lay photography creating a DIY infographic that simply explains how the water cycle works…” 图片：GooglePrompt: “Triptych infographic comparing three types of clouds: Cumulus, Stratus, and Cirrus. Each panel shows the cloud type in a dramatic sky with a bold label. High-contrast comic style. AR: 16:9” 图片：Google
以真实存在的事物为依据
模型可以先搜索视觉参考，再动笔。Google 让它先查一座真实的博物馆，再用新的风格画出来。
Prompt: “Create an image of Museum Clos Lucé. In the style of bright colored Synthetic Cubism. No text. Your plan is to first search for visual references, and generate after. Aspect ratio 16:9” 图片：Google
看得清的文字，任何语言
Google 表示，Nano Banana 2 可以为营销样稿和贺卡生成“准确、清晰的文字”，还能翻译、本地化图中的文字。
Prompts: “…Delicate script below reads: ‘Native Wildlife: Please Observe from a Distance.’…” 以及 “Take this concept and localize it to an Indian setting, including translation of all the text to Hindi.” 图片：Google
Google 称该模型可以“在一个工作流中保持最多 5 个角色的相似度和最多 14 个物体的保真度”。同一个吉祥物可以贯穿一整套作品。
Prompt: “Create an image of these 14 characters and items having fun at the farm… It is strictly important to keep identity consistent of all the 14 characters and items.” 图片：GooglePrompt: “Create a funny 6 part story with these 3 fluffy friends building a tree house… Keep the attire and identity consistent of all 3 characters…” 图片：Google
Prompts: “35mm soft blur, vibrant colors, soft light. Sailing at the ocean this baby kangaroo wearing a lilac raincoat…” 以及另外三个戴同一顶帽子的场景。图片：Google
Prompt: “Cinematic still, evoking a vibrant, dreamlike quality often found in highly stylized musical dramas…” 以多种宽高比生成。图片：Google
Flash 的速度，摄影级的画质
Google 表示，Nano Banana 2 带来“更鲜明的光线、更丰富的纹理和更锐利的细节”，同时保持 Flash 应有的速度。
Prompt: “This aerial shot captures a dramatic, misty landscape, likely a valley or glen, characterized by rolling, verdant hills and a winding river or loch…” 图片：Google
