Simon Willison • 11/13/2025

Nano Banana can be prompt engineered for extremely nuanced AI image generation

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This article analyzes Google's Nano Banana (Gemini 2.5 Flash) image generation model, highlighting its autoregressive architecture which differs from diffusion models. It showcases the model's exceptional prompt adherence for creating and modifying images, discusses a new Python library (gemimg) for its API, and explores its capabilities with trademarked characters and complex, multi-step instructions.

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#prompt engineering #image generation #Gemini
Nano Banana can be prompt engineered for extremely nuanced AI image generation

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