Use the Claude 3 models from Anthropic in VertexAI with langchain

[romaintoub]

Hello!

I'd like to use langchain with the Claude models from Anthropic coming from Vertex AI.

To leverage these models in Python, we have to use a function from anthropic called AnthropicVertex but this cannot be integrated as a langchain model.
AFAIK we cannot bring the Claude models from langchain-anthropic as the auth method is different: https://github.com/langchain-ai/langchain/tree/master/libs/partners/anthropic

Could this be created here with the VertexAI function? Or is there any alternative to bring this model with langchain?

Thank you!

[lkuligin]

Yes, we should add them with requiring an extra dependency.
I've added a first implementation (it doesn't support tools yet), if you'd like to contribute, that would be awesome.

[romaintoub]

amazing, thank you!