Add flex API

[SahilKapoordev]

Hi, Awesome project guys , thanks - do you think you could introduce OpenAI’s Flex Processing

Its a simple implementation, but saves around %50 : https://platform.openai.com/docs/guides/flex-processing?api-mode=responses

response = client.with_options(timeout=900.0).responses.create(
    model="o3",
    instructions="List and describe all the metaphors used in this book.",
    input="<very long text of book here>",
    **service_tier="flex",** 
)

Happy to work on it too!

[lukehinds]

Go for it @SahilKapoordev , sounds like a great idea.