langchain

a37dc83a - langchain_anthropic[patch]: Invoke callback prior to yielding token (#18274)

langchain_anthropic[patch]: Invoke callback prior to yielding token (#18274) ## PR title langchain_anthropic[patch]: Invoke callback prior to yielding ## PR message - Description: Invoke callback prior to yielding token in _stream and _astream methods for anthropic. - Issue: https://github.com/langchain-ai/langchain/issues/16913 - Dependencies: None - Twitter handle: None