[Release] langchain-ai/langchain langchain-perplexity==1.2.0: langchain-perplexity==1.2.0

langchain-perplexity v1.2.0 introduces PerplexityEmbeddings support and overhauls the integration with the official Perplexity SDK and Search API. The release includes content-block-centric streaming improvements, dependency updates (langsmith, pillow, pytest), security patches (CVE-2026-4539 via pygments), and standardized integration testing across partners. Multiple maintenance updates ensure compatibility with langchain-core 1.2.21+ and improve code quality through type checking and documentation enhancements.

Key Points

• •New PerplexityEmbeddings feature added for embedding support in Perplexity integration
• •Major integration overhaul with official Perplexity SDK and Search API for improved compatibility
• •Content-block-centric streaming (v2) implemented in core for better streaming support
• •Security patch applied: pygments upgraded to >=2.20.0 to address CVE-2026-4539
• •Minimum langchain-core dependency bumped to 1.2.21 for compatibility
• •Dependency updates: langsmith (0.4.31→0.7.31), pillow (11.3.0→12.2.0), pytest (9.0.3), urllib3 (2.6.3)
• •Model profiles enriched with new fields (text_inputs, text_outputs) and stable sorting
• •Integration testing standardized across all partner packages for consistency
• •Type checking infrastructure added via Makefile targets for improved code quality
• •Documentation improvements including docstring fixes and module-level documentation for partner integrations

Workflow Diagram

Concepts