The image model google/gemini-2.5-flash-image has been retired and removed from the Plugin API. It no longer appears in GET /ai-models or GET /pricing, and submissions referencing it are rejected immediately with a clear invalid_input error — before any credits are reserved. Previously, such jobs were accepted and then failed during generation.
Documentation examples now use the current Google model, google/gemini-3-pro-image-preview. If your plugin pins an AI model value, switch to a model from the live GET /ai-models catalog.