Model Migration on Productionized AI Applications: What Changes Beyond the API

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Google is retiring gemini-2.5-pro on Vertex AI on October 20, 2026. If your product runs on it, you need to migrate before then! I recently went through this migration practice on a legal document extraction AI-native product that runs on production. I knew going in that, it would be more than a config change, but I did not expect how many layers it would touch. Changing the model in an AI product is very different from pointing a client at a new endpoint or upgrading a library.

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