Hi, my application runs ChatVertexAI from langchain_google_vertexai. It’s not totally clear to me whether I should have to migrate anything after the deprecation from Google of vertexai.generative_models.
Is the library being updated to cope with deprecation in a manner that is transparent for users? Or should I migrate to other library?
This should be a fairly common case for many users, but surprisingly I could not find a clear answer to this issue. Thank you very much.
Hi, sorry for the slow reply. Yes, you should migrate. Rather than being updated to drop the deprecated module, ChatVertexAI itself is deprecated: it was marked deprecated in langchain-google-vertexai 3.2.0 and will be removed in 4.0.0.
Switch to ChatGoogleGenerativeAI from langchain-google-genai. It’s built on Google’s unified google-genai SDK and still runs against Vertex AI, so you keep your project, billing and existing credentials:
from langchain_google_genai import ChatGoogleGenerativeAI
llm = ChatGoogleGenerativeAI(model="gemini-3.5-flash", project="your-project-id")