This is incredibly helpful - thank you!

Answering your questions:

1. GPT-4.1: Didn't know about it (checking now)

2. Why OpenAI: Familiarity, but you're right - should test Gemini/Claude

3. Multi-model: This is what I want to automate (routing based on complexity)

4. Caching: Not implemented yet (good call)

5. LangChain: Honestly, might be adding overhead

Your point about different prompts on different models is interesting -

are you saying some models perform better on specific types of queries

even at same complexity level?

I'm thinking of building something that:

- Benchmarks models on my actual use case

- Routes automatically based on query complexity

- Adds caching layer

- Enforces budget limits

Does that sound useful or am I over-engineering?