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Three models are available, each with text-to-image and image-to-image endpoints.

NanoBanana

Fast model. Output is fixed at 1K.

NanoBanana 2

Higher quality. Selectable resolution and the full aspect-ratio set.

NanoBanana Pro

Top tier. Selectable resolution and the full aspect-ratio set.

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Endpoints

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Differences

Output is fixed at 1K. The resolution field is not accepted and supplying it is rejected. Supported aspect ratios are a subset of the full set — see Aspect ratios.
Selectable resolution (1K, 2K, 4K) and the full aspect-ratio set, including 1:4, 1:8, 4:1, 8:1, and auto.
Selectable resolution (1K, 2K, 4K) and the full aspect-ratio set. Uses the unprefixed endpoints POST /text-generations and POST /url-generations.