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How about haystack? It exists for long and much better architectured than langchain

How's your experience with it, have you used it in anger successfully?

Have an LLM document-QA app in production with a local model and Haystack.

Excellent documentation, great support (on Discord, unfortunately). Exploring Agents now.

I'm the culprit for Discord. But come join us! We host office hours and have NLP chats pretty often :)