Point the image default back at Imagen, which is what the code speaks - #7
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v0.15.2 repointed generateImage to gemini-3.1-flash-image without checking the wire format. The method builds an Imagen-shaped request, instances/parameters posted to :predict, and the Gemini image models do not speak that endpoint, so the default it shipped was very likely broken. Back to imagen-4.0-fast until the Gemini image path is actually implemented. That path is needed regardless: Imagen shuts down on 17 August 2026.
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Fixes a regression I shipped in v0.15.2.
generateImage()builds an Imagen-shaped request:instances/parametersposted to:predict, and parsespredictions[].bytesBase64Encodedback. v0.15.2 repointed its default togemini-3.1-flash-image, which is a Gemini model usinggenerateContent, so the default did not match the code around it.Reverted to
imagen-4.0-fast-generate-001, with a comment on the line explaining why it cannot simply be swapped.This is a stay of execution, not a fix. Imagen shuts down 17 August 2026, so the Gemini image path has to be implemented properly, as a new request shape and response parser, before then. Doing that is now the only thing standing between this library and having no working image generation at all.