LangChain — AI, Developer Tools product updates and releases, tracked on megachangelog.
Introduced langchain.mcp, a first-party adapter that connects any MCP server to LangChain agents via MCPAdapter, supporting multiple servers, flexible authentication, caching, and both legacy and modern protocol versions. Tools are automatically extracted and can be passed directly to create_agent for immediate use.
Initial alpha release of LangChain 1.4.0 with numerous improvements to MCP integration, middleware enhancements, agent creation, and tool handling. Includes fixes for content type conversion, docstrings, and multiple stability improvements across the framework.
Patch release of langchain-fireworks with bug fixes and improvements since version 1.6.0.
This patch release reverts a prior release and includes fixes and improvements to structured tools, making StructuredTool JSON-serializable.
Patch release with bug fixes and updates. See pull requests #39894 and #39964 for specific changes.
Release of langchain-anthropic version 1.7.0 with updates to thinking display mode, container support, and advisor tool beta header for the latest advisor API version.
Release of LangChain version 1.3.17 with updates and bug fixes since 1.3.16.
Release of langchain-perplexity version 1.4.1 with various bug fixes, improvements, and documentation updates since 1.4.0.
Release of langchain-fireworks version 1.6.0 with multiple updates and improvements including service tier support and various bug fixes.
Bug fixes and improvements included in the 1.3.16 release. Fixes addressing multiple issues to enhance stability and performance.
Release of langchain-anthropic version 1.6.1 with changes from the previous 1.6.0 release.
Release of langchain-openai version 1.6.0 with updates to chat result creation and OpenAI integration improvements.
Release of langchain-anthropic version 1.6.0 with updates and improvements since version 1.5.6.
langchain-core version 1.6.0 includes improvements to StructuredTool with injected args keys, new RunnablePick class, enhanced convert_to_openai_function to handle callables and non-dict mappings, and fixes to Runnable pipe coercion and exception handling.
Release of langchain-openai version 1.5.2 with various bug fixes and improvements to OpenAI integration and token counting functionality.
Initial alpha release of langchain-openai 1.5.2 containing numerous improvements, bug fixes, and feature additions across OpenAI integration including support for new models, structured output enhancements, token counting improvements, and various stability and performance updates.
LangChain core library updated to version 1.5.6 with changes from the previous 1.5.5 release.
Release of langchain-openrouter version 0.2.8 with various bug fixes and improvements to the OpenRouter integration for LangChain.
langchain-core updated to version 1.5.5 with multiple bug fixes and improvements including enhancements to DictPromptTemplate list values handling.
Release of langchain-openai version 1.5.1 with bug fixes and improvements since the previous 1.5.0 version.
Release of langchain-openai version 1.5.0 with updates since version 1.4.3.
Release of langchain-anthropic 1.5.6 with support for tool_search_tool_result blocks, enabling improved tool interaction handling with Anthropic models.
Released version 1.5.5 of langchain-anthropic with a fix for KeyError that occurred when renaming files in Claude file-tool middleware.
Bug fixes and improvements across middleware, tool calling, chat models, and structured responses. Notable changes include trace_policy support on AgentMiddleware, fixes to SummarizationMiddleware and ToolRetryMiddleware, and improved state schema handling in tool wrappers.
Release of langchain-core 1.5.4 containing improvements and bug fixes including enhancements to RootModel runnables and various stability updates.
Release of langchain-openai version 1.4.3 with updates including response header inclusion support and related fixes.
Release of langchain-openai version 1.4.2 containing fixes and improvements to OpenAI integration, including handling of context window errors and authorization updates.
This release includes updates to tool_choice handling and adds a user_profile_id convenience attribute for improved integration with Anthropic's API.
Patch release with LANGSMITH_API_KEY support for gateway configuration.
Release of langchain-anthropic version 1.5.3 with updates and improvements from the previous 1.5.2 release.
Release of langchain-core version 1.5.2 with updates and fixes since 1.5.1.
Release of langchain-fireworks version 1.5.2 with bug fixes and improvements since version 1.5.1.
Release of langchain-anthropic version 1.5.2 with incremental updates since 1.5.1.
Release of langchain-openai version 1.4.1 with improvements to the gpt-5.3-chat-latest profile and related updates from upstream changes.
Release of langchain-fireworks version 1.5.1 with incremental changes and fixes.
Release of langchain-core 1.5.1 with improvements to tool call schema caching for BaseTool token counting in the count_tokens_approximately method.
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