Google 发 Nano Banana 2.1：基于 Gemini 3.6 Flash、价格较 2 代大约腰斩，1K 图从 6.70 美分降到 3.36 美分、4K 从 15.10 降到 7.56；一次最多读 14 张参考图、可保持 4 个角色与 10 个物体一致，旧模型 10 月 29 日关停
Google's new image model Nano Banana 2.1 generates better images for less money
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导读
Google 发布 Nano Banana 2.1，用于图像生成与编辑，取代 2026 年 2 月推出的 Nano Banana 2，官方称各维度全面改进。文章的对比口径很清：Nano Banana Pro 大概率仍是 Google 最好的图像模型，且它用的是较新的 Pro 型号 3.1，而 2.1 用的是 Gemini 3.6 Flash；下一次图像质量的跃升可能要等已宣布的 Pro 型号 Gemini 4 Argon。价格是最实的部分：较 Nano Banana 2 大约砍半——1K 图 3.36 美分（原 6.70）、4K 图 7.56 美分（原 15.10），而 Nano Banana Pro 的 1K 图要 13.40 美分，明显更高。能力上，2.1 一次可处理多达 14 张参考图，能让最多 4 个角色与 10 个物体保持一致；改进覆盖视觉质量、文本渲染、跨对话轮次的角色一致性、宽幅全景与信息图；模型可接 Google 搜索，并提供 minimal、medium、high 三档思考级别来影响出图质量。基准侧则给出了一个诚实的判断：2.1 在部分项上大幅胜过 Pro，但 Nano Banana 2 也在同一批测试里追平过 Pro，而实际出图中 Pro 常常仍明显更好，官方也把 2.1 定位为 Pro 的「更高效替代」。它以 Flash 档速度运行，支持 1K/2K/4K，已在 Gemini 应用、搜索 AI 模式、AI Studio、Flow、Stitch、Ads 与 Gemini Enterprise Platform 铺开；旧模型 gemini-3.1-flash-image 将于 2026 年 10 月 29 日关停。
推荐理由
同一篇里同时给出分辨率单价表、一致性上限、基准分数与旧模型下线日期，是图像模型选型少有的完整口径。
主体与标签
Google#模型发布#图像生成#定价/成本
正文
Google has released Nano Banana 2.1, a new model for image generation and editing.
It replaces Nano Banana 2 , released in February 2026, and Google says it improves on previous versions "across the board." Nano Banana Pro likely remains Google's best image model, but it uses the most recent Pro model, 3.1, while 2.1 uses Gemini 3.6 Flash . The next major gain in image quality could come with Google's announced Pro model, Gemini 4 Argon .
Google is also cutting prices roughly in half compared with Nano Banana 2. A 1K image costs 3.36 cents, down from 6.70 cents, while a 4K image drops from 15.10 to 7.56 cents. Nano Banana Pro costs considerably more at 13.40 cents per 1K image.
Model | 0.5K | 1K | 2K | 4K Nano Banana 2.1 | - | 3.36 | 5.04 | 7.56 Nano Banana 2 / Gemini 3.1 Flash Image | 4.50 | 6.70 | 10.10 | 15.10 Nano Banana 2 Lite / Gemini 3.1 Flash Lite Image | - | 3.36 | - | - Nano Banana Pro / Gemini 3 Pro Image | - | 13.40 | 13.40 | 24.00 Nano Banana / Gemini 2.5 Flash Image | - | 3.90 | - | -
According to Google , version 2.1 improves visual quality, text rendering, character consistency across conversation turns, wide panoramas, and infographics. It can process up to 14 reference images at once, keeping up to four characters and ten objects consistent. The model also connects to Google Search and offers minimal, medium, and high thinking levels that affect image quality.
Although 2.1 sometimes beats Pro by a wide margin in benchmarks, Nano Banana 2 also matched it in those tests. In practice, Nano Banana Pro often still produces noticeably better images. Google describes 2.1 as "the more efficient counterpart" to Pro.
Benchmark | Nano Banana 2.1 (Thinking) | Nano Banana 2.1 (No Thinking) | Gemini 3.1 Flash Image | Gemini 3 Pro Image Text-to-Image | | | | Overall Preference | 1050 ± 14 | 1015 ± 13 | 990 ± 7 | 935 ± 8 Infographic Design | 1048 ± 17 | 1001 ± 17 | 961 ± 12 | 912 ± 12 Infographic Accuracy | 0.521 | 0.328 | 0.179 | 0.265 Editing | | | | General Editing | 1026 ± 12 | 980 ± 15 | 938 ± 11 | 939 ± 10 Single-Character Consistency | 1028 ± 14 | 1021 ± 14 | 981 ± 10 | 991 ± 9 Multi-Character Consistency | 1106 ± 14 | 1068 ± 14 | 978 ± 10 | 1011 ± 10 Mask/Ink-Based Editing | 1049 ± 15 | 1042 ± 16 | 965 ± 12 | 927 ± 12 Product Consistency | 1024 ± 18 | 981 ± 18 | 955 ± 22 | 965 ± 14 Stylization | 1062 ± 20 | 1036 ± 17 | 991 ± 12 | 990 ± 12 Multi-Reference Editing | 1066 ± 22 | 1041 ± 20 | 988 ± 13 | 989 ± 12
The model runs at Flash-tier speed, supports 1K, 2K, and 4K resolutions, and is already rolling out across Google's products. These include the Gemini app, AI Mode in Google Search, Google AI Studio, Flow by Google, Stitch by Google, Google Ads, and the Gemini Enterprise Platform.
More details are available in the model card . Google will shut down the previous model , "gemini-3.1-flash-image," on October 29, 2026.