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v0.15.3
Fixes a regression in v0.15.2.
generateImage() builds an Imagen-shaped request (instances/parameters on :predict). v0.15.2 repointed its default to gemini-3.1-flash-image, a Gemini model that uses generateContent, so the default no longer matched the code around it. Reverted to imagen-4.0-fast-generate-001.
A stay of execution, not a fix. Imagen shuts down 17 August 2026 and the Gemini image path still needs implementing as a new request shape and response parser. The video default fixed in v0.15.2 is unaffected and remains correct.