Feature request: add support for Perplexity API

[wajdi-b]

Perplexity supports many LLM out of the box and has an API similar to OpenAI. People who already have it would benefit from using their subscription instead of getting charged by OpenAI on top.

[jeanlucthumm]

You can use LiteLLM already. Doesn't that do the same thing?

[wajdi-b]

It actually works great without it by just setting configuration variables API_BASE_URL to https://api.perplexity.ai, OPENAI_API_KEY to the Perplexity API key, as well as DEFAULT_MODEL to one of the values found here