From the source

Deprecation announcement

Gemini 3.1 Flash Image deprecated, migrate to Nano Banana 2.1

Deprecation

Google DeepMind has deprecated the gemini-3.1-flash-image model, advising users to migrate to gemini-nano-banana-2.1.

From the source
The gemini-3.1-flash-image model is deprecated (no shutdown date announced). Migrate to gemini-nano-banana-2.1.
ai.google.dev

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