Automation library · AI assistants

Dynamically switch between LLMs for AI agents with LangChain

Started by someone opening a chat with it. It calls services over plain HTTP rather than through connectors. It hands the judgement calls to OpenAI. 15 steps, 1 branch: a working afternoon to understand properly.

MediumCalls a model: OpenAI

15 stepsMedium: a working afternoon
1Branch: places the flow splits
0Loops or waits
0Services by connector: it calls them over plain HTTP

The flow

Starts it 1Model 7Logic 7

The steps in the order they run, from what starts it.

  1. 1When chat message receivedChat triggerStarts it
  2. 2OpenAI 4o-miniLm Chat Open AiModel
  3. 3OpenAI 4oLm Chat Open AiModel
  4. 4OpenAI o1Lm Chat Open AiModel
  5. 5OpenAI Chat ModelLm Chat Open AiModel
  6. 6Set LLM indexSetLogic
  7. 7Switch ModelCodeModel
  8. 8Validate responseSentiment AnalysisModel
  9. 9Generate responseChain LlmModel
  10. 10Return resultSetLogic
  11. 11Increase LLM indexSetLogic
  12. 12Check for expected errorIfLogic
  13. 13No Operation, do nothingNo OpLogic
  14. 14Loop finished without resultsSetLogic
  15. 15Unexpected errorSetLogic

How it's built

Starts on
Someone opening a chat with it
Steps
15, with 1 branch
Size
Medium: a working afternoon
Connects to
Nothing by connector; it calls services over plain HTTP
Model
OpenAI

Questions

What does it need to run?

An n8n account, and a key for OpenAI. You connect your own accounts after importing it; none are included.

What starts it?

It starts on someone opening a chat with it.

Does it use AI?

Yes. It calls OpenAI. Model calls are billed by the provider, not by n8n.

How long does it take to set up?

Plan an afternoon. 15 steps is enough that you should read each one before running it.

How do I import it?

Copy the workflow, open a new workflow in n8n and paste. The steps appear on the canvas, ready for your own accounts.

Before you run it

Nothing here has been tested by us. It is somebody's working automation, read and described from its own steps. Treat the connections it wants as a list of accounts it will touch, and read the 15 steps before you point it at anything that matters.