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Neither of this really requires OpenAI. You can do it with locally-running models via something like https://github.com/mudler/LocalAI

Terrific. I also see that Simon Wilison's LLM tool does it.

Yes, `llm` is a great tool. I believe it uses OpenAI by default but supports installing local models as plugins -- https://simonwillison.net/2023/Jul/12/llm/