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by simonw 160 days ago
It's not supported by Gemini 3: https://ai.google.dev/gemini-api/docs/gemini-3#migrating_fro...

> Image segmentation: Image segmentation capabilities (returning pixel-level masks for objects) are not supported in Gemini 3 Pro or Gemini 3 Flash. For workloads requiring native image segmentation, we recommend continuing to utilize Gemini 2.5 Flash with thinking turned off or Gemini Robotics-ER 1.5.