o4-mini and o3: allow for service_tier parameter

[alexzeitgeist]

It cuts down costs by half. See more here: https://platform.openai.com/docs/guides/flex-processing

[tiagomelobr]

There is any way for us to use this while this is not available in Roo Code?

[sr-tream]

I use LiteLLM for this with:

{
  "service_tier": "flex"
}

in "LiteLLM Params"