• This is actually a bug report.
• I am not getting good LLM Results
• I have tried asking for help in the community on discord or discussions and have not received a response.
• I have tried searching the documentation and have not found an answer.

What Model are you using?

• gpt-3.5-turbo
• gpt-4-turbo
• gpt-4
• Other (please specify): us.anthropic.claude-3-5-sonnet-20241022-v2:0

Describe the bug
The usage object for Anthropic’s Bedrock client does not contain certain fields (cache_creation_input_tokens, cache_read_input_tokens), which causes an AttributeError in instructor.utils.update_total_usage() when attempting to sum usage stats.

To Reproduce

1. Instantiate an AnthropicBedrock client (e.g., anthropic.AnthropicBedrock(...)).
2. Use instructor.from_anthropic to wrap the client.
3. Run test_client_anthropic_bedrock_response
4. Get error: AttributeError: 'Usage' object has no attribute 'cache_creation_input_tokens'.

Expected behavior
instructor should gracefully handle Anthropic usage objects that don’t have those fields, rather than raising an AttributeError.

Screenshots
N/A