Here is a possible case study for you. https://OpenRouter.ai.
They are doing what you think of doing, for the various LLM APIs. Three reasons why they offer added value:
- Some people cannot access some of these APIs directly (GPT-4 in the advanced settings, Anthropic’s Claude is still close access)
- They abstract the way these API are accessed so that the code to use different models does not have to change much.
- For some reason, they cost the same as the original API
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