Hello,

Thank you for such a great library! I'm really enjoying using it.

I'm encountering a limitation with Claude 3.7 regarding the output token limit of 8192 tokens.

There is a beta header that can be added to increase the output tokens. According to Anthropic's [documentation](https://docs.anthropic.com/en/docs/about-claude/models/all-models), "Include the beta header output-128k-2025-02-19 in your API request to increase the maximum output token length to 128k tokens for Claude 3.7 Sonnet."

Is there a possibility of adding this header? Perhaps during the configuration, we could have a flag to enable or disable the header.

Thank you in advance!