It can generate highly detailed images
https://x.com/cfryant/status/2107849002259784148
Nano Banana 2.1 generates highly detailed 4K images without upscaling
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Google Flow says its new Nano Banana 2.1 model can generate highly detailed images, with the source's texture and detail tests showing 4K native outputs and no upscaling of any kind. The example images come from creator @cfryant, whose thread is cited as the evidence for the claim.
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Part of a thread · earlier post
A thread of texture and detail tests with the new Nano Banana 2.1. 4k native outputs, no upscaling of any kind.
Source: Google Flow · x.comPublished · added here