[Release] langchain-ai/langchain langchain-perplexity==1.4.1: langchain-perplexity==1.4.1

langchain-perplexity version 1.4.1 is released with several bug fixes and dependency updates. Key improvements include fixing the Responses API input format by adding type="message" attributes, preserving caller extra_body parameters, and using the correct supported Responses API model. The release also includes dependency bumps for pillow, vcrpy, and langsmith, along with documentation updates and package version tracking enhancements.

Key Points

• •Fixed Responses API input items by including type="message" attribute for proper message formatting
• •Preserved caller extra_body parameter to maintain custom request configurations
• •Updated to use the correct supported Responses API model instead of unsupported versions
• •Bumped critical dependencies: pillow (12.2.0 → 12.3.0), vcrpy (8.1.1 → 8.2.1), langsmith (0.8.5 → 0.8.18)
• •Added package version tracking to tracing metadata for better observability and debugging
• •Refreshed README with updated installation instructions and resources
• •Unified type-checking configuration across the monorepo with mypy 2.1
• •Enhanced standard tests to validate tool call chunks during streaming operations
• •Improved docstring formatting by replacing double backticks for consistency

Workflow Diagram

Concepts