AWS Bedrock via LiteLLM

[controldev]

This may be a stupid question, but I tried using the LiteLLM model provider to use Claude via AWS Bedrock like this:

model = LitellmModel(
    model="bedrock/anthropic.claude-3-5-sonnet-20241022-v2:0"
)

I can see authentication is done using the environment variables in the LiteLLM documentation.

What does the api_key parameter do? Is this only valid for certain inference providers (e.g. direct OpenAI)?